CA2163083C - Security marking method and composition - Google Patents
Security marking method and composition Download PDFInfo
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- CA2163083C CA2163083C CA002163083A CA2163083A CA2163083C CA 2163083 C CA2163083 C CA 2163083C CA 002163083 A CA002163083 A CA 002163083A CA 2163083 A CA2163083 A CA 2163083A CA 2163083 C CA2163083 C CA 2163083C
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- marking fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
- B41M3/142—Security printing using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Paints Or Removers (AREA)
- Road Signs Or Road Markings (AREA)
- Printing Methods (AREA)
Abstract
A security marking method comprises marking a portion of the substrate by applying a first marking fluid which is invisible to an unaided eye when illuminated by both visible light and ultraviolet light and activating the marked portion by applying a second marking fluid thereon. The second marking fluid is reactable with the first marking fluid to be invisible to an unaided human eye when illuminated by visible light and fluorescent when illuminated by ultraviolet light. The invention also includes the composition comprising the first and second marking fluids.
Description
W094/27829 ~ lC 3 ~ 8 3 PCT~S94/03237 A SECURITY ~RTNG METHOD AND COMPOSITION
BACKGROUND OF THE lNV~N-llON
The present invention relates to a method and a composition for identifying diverse products that can be made of diverse materials, such as paper documents, appliances, clothing, boxes, glass products, plastic finish products and others in a covert manner.
It is, of course, well known that various means have been proposed in the past for covertly marking and identifying items. The previously used identifying methods utilized essenti.ally the so-called ultraviolet inks or paints that fluoresce when subjected to an ultraviolet light source. Such simple fluorescent markings used in conjunction with ultraviolet lights provide of course a dramatic effect, since the marking, which is originally seemingly invisible in visible or normal light, becomes brightly florescent under ultraviolet radiation. However, the fundamental drawback of such systems is that they are by their nature readily visible upon illumination by ultraviolet radiation and, therefore, can be easily located by any counterfeiter or product diverter.
Consequently, such marks can be removed or they can be altered, since fluorescent dyes known as optical brighteners and inks are readily available today on the market.
W094/27829 ~63~ 2 PCT~S94/03237 SUMMARY OF THE lNv~N-LlON
The object of the present invention is to provide a dramatically effective solution to the above-mentioned problem by keeping the covert marking invisible both under regular (visible) light and under ultraviolet illumination.
Thus, only the originator of the marking knows its location, and, therefore, to erase or modify such a covert mark by an uninformed intruder is practically impossible without destroying the entire substrate that carries the marking.
The present invention is based upon the use of a reactive marking composition A which is normally invisible both to the naked eye under normal or visible lighting conditions and when viewed under ultraviolet radiation. This marking composition A is, however, reactive with another composition B in such a manner that upon interaction with composition B, the original marking continue~s to remain practically invisible to the naked eye under normal lighting conditions, while on the other hand it becomes brilliant by fluorescence when subjected to any one of the commonly used sources of ultraviolet radiation.
Since this covert marking reveals itself only following both the activation process and the provision of ultraviolet illumination, the method of the present invention is qualified as a double security, fluorescence on demand, marking system.
Indeed the first and high level of security is wo 94,27829 ~ 1 6 3 0 8 ~ PCT~S94/03237 provided by the invisibility of the marking to the naked eye both under normal lighting and ultraviolet illumination conditions. The second level of security which plays the role of a double lock is provided by the fact that the mark must be activated with a special marker and the marking still remains practically invisible to the naked eye and reveals itself only in the form of a switched on fluorescence which shows only upon illumination by a commonly available ultraviolet radiation source.
It is significant that the present invention lends itself perfectly well to applications where a dark colored or even pitch black substrate is involved, since the fluorescent behavior renders the mark perfectly visible against the dark or black background.
In accordance with the present invention, the method comprises the steps of marking a portion of a substrate by applying a first marking fluid, which upon drying is invisible to the human eye both when illuminated by visible light and with ultraviolet light. The marked portion is activated by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided hl~m~n eye when illuminated by visi.ble light but it fluoresces when illuminated by ultraviolet light and thereby becomes visible.
The first marking fluid is preferably selected from amino pthalides and quinazolines, with the second marking W094/27829 ~ i PCT~S94/03237 fluid selected from novalac resins, bisphenols and hydroxybenzoates.
Alternatively, the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates, and the second marking fluid is selected from amino pthalides and quinazolines.
In one embodiment, the first and second marking fluids are each applied in solvent vehicles, preferably selected from alcohol, acetone, methylethylketone or a combination thereof.
~ In an alternative embodiment, the first and second marking fluids are applied as micronized particles in an aqueous solution with a binder. The activation step further comprises applying a solvent to the applied first and second marking fluids on the substrate.
The present invention also relates to a security marking composition which comprises the first and second marking fluids as set forth above.
These and other features and advantages of the present invention will become more apparent from the detailed description of the present invention taken with the attached drawings, wherein:
W094/27829 ~ 6 ~ 0 83 PCT~S94/03237 BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic view of the first step of the method according to the present invention;
Fig. 2 is a schematic representation of the second step of the method according to the present invention; and Fig. 3 is a schematic representation of a third step in accordance with the method of the present invention.
DET~TT-~n DESCRIPTION OF THE lNV~NllON
The system of the present invention begins with the concept of applying, to a surface, a colorless marking fluid containing the composition A using a vehicle which upon drying leaves no visible trace on the applied surface. It has been discovered that a choice from the well known solvents such as alcohol, acetone, methylethylketone, etc. can easily be made to act as a vehicle for composition A with regard to a substrate, such that after drying practically no visible trace is left on the surface. Furthermore, as described above, the molecular structure of composition A is such that it is practically non-interactive to radiation at least down to the usual shortwave ultraviolet wavelength range of one to two hundred nanometers and preferably even below such wavelengths.
Fig. 1 shows the first step in the method wherein the marking 2 is applied to a substrate 1. The marking 2 is invisible both under normal lighting conditions (visible W094/27829~ 83 PCT~S94/03237 light) and when illuminated by an ultraviolet light source 4.
The substrate can be from a diverse range of materials, including paper, cardboar~, plastic, metals, fabrics, plastics, glass, etc. When a composition B is carried by a solvent such as alcohol, acetone, methylethylketone, etc., and is applied over the same area 3 where the marking A has been applied as is shown in Fig. 2, compositions A and B react and the molecular structure of composition A is modified in such a way that the new modified molecule exhibits a pronounced, fluorescence effect. Specifically, the electronic structure of the new molecule exhibits a strong absorption at ultraviolet frequencies in the range of one hundred to four hundred nanometer wavelengths and correspondingly exhibits a strong fluorescence emission in the visible spectrum, as shown in Fig. 3 when illuminated by an ultraviolet light source 4.
Such emissions, being relatively monochromatic and appearing as a blue, yellow, red or orange color, will be visible even on a pitch black substrate. The new molecule when not excited by the ultraviolet radiation from source 4, does not exhibit any appreciable absorption or emission in the visible spectrum and thus r~; n.q invisible.
In accordance with the present invention, it has been found that amlno pthalides and quinazolines can be used as composition A in solvent vehicles such as alcohol, acetone and methylethylketone or any combination thereof. In one embodiment, highly micronized particles of composition A can wo 94,27829 2 ~ 6 3 0 8 3 PCT~S94/03237 be carried by an aqueous solution and be applied with a binder to a given surface or substrate. It has been found that materials such as novalac resins, bisphenols and hydroxybenzoates can be used as composition B in solvent vehicles such as alcohol, acetone and methylethylketone or any combination thereof. In an alternative embodiment, the composition B can also be highly micronized and carried by an aqueous solution. When compositions A and B are applied through a solvent, the two molecules react instantly and the mechanism described above makes the marking visible under ultraviolet radiation. When compositions A and B include the micronized particles and are applied through and aqueous vehicle, the activation will take place only after highlighting the combination of compositions A and B with a solvent such as alcohol, acetone methylethylketone, etc.
Activation in this case can also be achieved by heating the combination up to a temperature in the range of around 65O to 100 C.
When the method and composition according to the present invention is applied to specific substrates, it is important to take into consideration the material, finish and color of the substrate in order to insure a high level of naked eye invisibility. In particular, the vehicle carrying composition A must be essentially clear, and it should not aggressively attack the substrate surface, and its own interaction with ultraviolet light must match that of the ~63Q~3 8 ~
substrate. Thus if the substrate tends to absorb ultraviolet light, the vehicle for A must do the same and on the contrary if the substrate tends to show fluorescence then the vehicle for A should do the same. This latter feature can easily be achieved by the addition of mlnute percentages of optical absorbers or optical brighteners to the vehicle of A as the need dictates.
The following are examples of compositions usable as chemicals A and B:
Chemical A:
3,3-Bis (4-Dimethylaminophenyl) -6-dimethylaminophthalide (CVL) (molecular formula C26 H29 N3 2) 3-(4-Dimethylaminophenyl)-3-[n,N-Bis(4-Octylphenyl)-amino] phthalide.
(molecular formula C44 H56 N2 2) Quinazoline Dye Chemical B:
Benzyl 4-Hydroxybenzoate (molecular formula C~4 H12 3) 4,4-Isopropylidenediphenol Novalac resin-modified alkylphenol polymer (molecular formula (CH3)2C(C6H4OH)2) EXAMPLE
An amino phthalide C44 H56 2 or 3-(4_ Dimithylaminophenyl)-3-[n,N-Bis(4-Octylphenylamino]phthalide was used as chemical A and was dissolved in normal propyl alcohol or in methylethylketone. Benzyl 4-hydroxybenzoate (C14 W094/27829 2 1 6 3 0 8 3 PCT~S94/03237 H12 3) was used as chemical B and was dissolved in normal propyl alcohol or in methylethylketone. Chemical A and chemical B were used to put two separate numerical marks on a black leather substrate. The marks were dried and became totally invisible to the eye both when the marks were held under a normal light source and under an ultraviolet light source.
Each mark was highlighted with the other of a chemical B or A carrying vehicle and allowed to dry. Under visual ex~min~tion with the help of an ordinary light source, ~ither marking could be seen on the leather substrate. When an ultraviolet light source was shined over the substrate, a very bright orange fluorescent glow was observed over the original marks and made them readable.
It will be understood by those persons skilled in this art that the present invention has been described hereinabove by way of example and by preferred embodiment and not as a limitation on the invention. It is to be realized that various changes, alterations, rearrangements and modifications can be made by those skilled in the art to which it relates without departing from the spirit and the scope of the present invention.
BACKGROUND OF THE lNV~N-llON
The present invention relates to a method and a composition for identifying diverse products that can be made of diverse materials, such as paper documents, appliances, clothing, boxes, glass products, plastic finish products and others in a covert manner.
It is, of course, well known that various means have been proposed in the past for covertly marking and identifying items. The previously used identifying methods utilized essenti.ally the so-called ultraviolet inks or paints that fluoresce when subjected to an ultraviolet light source. Such simple fluorescent markings used in conjunction with ultraviolet lights provide of course a dramatic effect, since the marking, which is originally seemingly invisible in visible or normal light, becomes brightly florescent under ultraviolet radiation. However, the fundamental drawback of such systems is that they are by their nature readily visible upon illumination by ultraviolet radiation and, therefore, can be easily located by any counterfeiter or product diverter.
Consequently, such marks can be removed or they can be altered, since fluorescent dyes known as optical brighteners and inks are readily available today on the market.
W094/27829 ~63~ 2 PCT~S94/03237 SUMMARY OF THE lNv~N-LlON
The object of the present invention is to provide a dramatically effective solution to the above-mentioned problem by keeping the covert marking invisible both under regular (visible) light and under ultraviolet illumination.
Thus, only the originator of the marking knows its location, and, therefore, to erase or modify such a covert mark by an uninformed intruder is practically impossible without destroying the entire substrate that carries the marking.
The present invention is based upon the use of a reactive marking composition A which is normally invisible both to the naked eye under normal or visible lighting conditions and when viewed under ultraviolet radiation. This marking composition A is, however, reactive with another composition B in such a manner that upon interaction with composition B, the original marking continue~s to remain practically invisible to the naked eye under normal lighting conditions, while on the other hand it becomes brilliant by fluorescence when subjected to any one of the commonly used sources of ultraviolet radiation.
Since this covert marking reveals itself only following both the activation process and the provision of ultraviolet illumination, the method of the present invention is qualified as a double security, fluorescence on demand, marking system.
Indeed the first and high level of security is wo 94,27829 ~ 1 6 3 0 8 ~ PCT~S94/03237 provided by the invisibility of the marking to the naked eye both under normal lighting and ultraviolet illumination conditions. The second level of security which plays the role of a double lock is provided by the fact that the mark must be activated with a special marker and the marking still remains practically invisible to the naked eye and reveals itself only in the form of a switched on fluorescence which shows only upon illumination by a commonly available ultraviolet radiation source.
It is significant that the present invention lends itself perfectly well to applications where a dark colored or even pitch black substrate is involved, since the fluorescent behavior renders the mark perfectly visible against the dark or black background.
In accordance with the present invention, the method comprises the steps of marking a portion of a substrate by applying a first marking fluid, which upon drying is invisible to the human eye both when illuminated by visible light and with ultraviolet light. The marked portion is activated by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided hl~m~n eye when illuminated by visi.ble light but it fluoresces when illuminated by ultraviolet light and thereby becomes visible.
The first marking fluid is preferably selected from amino pthalides and quinazolines, with the second marking W094/27829 ~ i PCT~S94/03237 fluid selected from novalac resins, bisphenols and hydroxybenzoates.
Alternatively, the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates, and the second marking fluid is selected from amino pthalides and quinazolines.
In one embodiment, the first and second marking fluids are each applied in solvent vehicles, preferably selected from alcohol, acetone, methylethylketone or a combination thereof.
~ In an alternative embodiment, the first and second marking fluids are applied as micronized particles in an aqueous solution with a binder. The activation step further comprises applying a solvent to the applied first and second marking fluids on the substrate.
The present invention also relates to a security marking composition which comprises the first and second marking fluids as set forth above.
These and other features and advantages of the present invention will become more apparent from the detailed description of the present invention taken with the attached drawings, wherein:
W094/27829 ~ 6 ~ 0 83 PCT~S94/03237 BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic view of the first step of the method according to the present invention;
Fig. 2 is a schematic representation of the second step of the method according to the present invention; and Fig. 3 is a schematic representation of a third step in accordance with the method of the present invention.
DET~TT-~n DESCRIPTION OF THE lNV~NllON
The system of the present invention begins with the concept of applying, to a surface, a colorless marking fluid containing the composition A using a vehicle which upon drying leaves no visible trace on the applied surface. It has been discovered that a choice from the well known solvents such as alcohol, acetone, methylethylketone, etc. can easily be made to act as a vehicle for composition A with regard to a substrate, such that after drying practically no visible trace is left on the surface. Furthermore, as described above, the molecular structure of composition A is such that it is practically non-interactive to radiation at least down to the usual shortwave ultraviolet wavelength range of one to two hundred nanometers and preferably even below such wavelengths.
Fig. 1 shows the first step in the method wherein the marking 2 is applied to a substrate 1. The marking 2 is invisible both under normal lighting conditions (visible W094/27829~ 83 PCT~S94/03237 light) and when illuminated by an ultraviolet light source 4.
The substrate can be from a diverse range of materials, including paper, cardboar~, plastic, metals, fabrics, plastics, glass, etc. When a composition B is carried by a solvent such as alcohol, acetone, methylethylketone, etc., and is applied over the same area 3 where the marking A has been applied as is shown in Fig. 2, compositions A and B react and the molecular structure of composition A is modified in such a way that the new modified molecule exhibits a pronounced, fluorescence effect. Specifically, the electronic structure of the new molecule exhibits a strong absorption at ultraviolet frequencies in the range of one hundred to four hundred nanometer wavelengths and correspondingly exhibits a strong fluorescence emission in the visible spectrum, as shown in Fig. 3 when illuminated by an ultraviolet light source 4.
Such emissions, being relatively monochromatic and appearing as a blue, yellow, red or orange color, will be visible even on a pitch black substrate. The new molecule when not excited by the ultraviolet radiation from source 4, does not exhibit any appreciable absorption or emission in the visible spectrum and thus r~; n.q invisible.
In accordance with the present invention, it has been found that amlno pthalides and quinazolines can be used as composition A in solvent vehicles such as alcohol, acetone and methylethylketone or any combination thereof. In one embodiment, highly micronized particles of composition A can wo 94,27829 2 ~ 6 3 0 8 3 PCT~S94/03237 be carried by an aqueous solution and be applied with a binder to a given surface or substrate. It has been found that materials such as novalac resins, bisphenols and hydroxybenzoates can be used as composition B in solvent vehicles such as alcohol, acetone and methylethylketone or any combination thereof. In an alternative embodiment, the composition B can also be highly micronized and carried by an aqueous solution. When compositions A and B are applied through a solvent, the two molecules react instantly and the mechanism described above makes the marking visible under ultraviolet radiation. When compositions A and B include the micronized particles and are applied through and aqueous vehicle, the activation will take place only after highlighting the combination of compositions A and B with a solvent such as alcohol, acetone methylethylketone, etc.
Activation in this case can also be achieved by heating the combination up to a temperature in the range of around 65O to 100 C.
When the method and composition according to the present invention is applied to specific substrates, it is important to take into consideration the material, finish and color of the substrate in order to insure a high level of naked eye invisibility. In particular, the vehicle carrying composition A must be essentially clear, and it should not aggressively attack the substrate surface, and its own interaction with ultraviolet light must match that of the ~63Q~3 8 ~
substrate. Thus if the substrate tends to absorb ultraviolet light, the vehicle for A must do the same and on the contrary if the substrate tends to show fluorescence then the vehicle for A should do the same. This latter feature can easily be achieved by the addition of mlnute percentages of optical absorbers or optical brighteners to the vehicle of A as the need dictates.
The following are examples of compositions usable as chemicals A and B:
Chemical A:
3,3-Bis (4-Dimethylaminophenyl) -6-dimethylaminophthalide (CVL) (molecular formula C26 H29 N3 2) 3-(4-Dimethylaminophenyl)-3-[n,N-Bis(4-Octylphenyl)-amino] phthalide.
(molecular formula C44 H56 N2 2) Quinazoline Dye Chemical B:
Benzyl 4-Hydroxybenzoate (molecular formula C~4 H12 3) 4,4-Isopropylidenediphenol Novalac resin-modified alkylphenol polymer (molecular formula (CH3)2C(C6H4OH)2) EXAMPLE
An amino phthalide C44 H56 2 or 3-(4_ Dimithylaminophenyl)-3-[n,N-Bis(4-Octylphenylamino]phthalide was used as chemical A and was dissolved in normal propyl alcohol or in methylethylketone. Benzyl 4-hydroxybenzoate (C14 W094/27829 2 1 6 3 0 8 3 PCT~S94/03237 H12 3) was used as chemical B and was dissolved in normal propyl alcohol or in methylethylketone. Chemical A and chemical B were used to put two separate numerical marks on a black leather substrate. The marks were dried and became totally invisible to the eye both when the marks were held under a normal light source and under an ultraviolet light source.
Each mark was highlighted with the other of a chemical B or A carrying vehicle and allowed to dry. Under visual ex~min~tion with the help of an ordinary light source, ~ither marking could be seen on the leather substrate. When an ultraviolet light source was shined over the substrate, a very bright orange fluorescent glow was observed over the original marks and made them readable.
It will be understood by those persons skilled in this art that the present invention has been described hereinabove by way of example and by preferred embodiment and not as a limitation on the invention. It is to be realized that various changes, alterations, rearrangements and modifications can be made by those skilled in the art to which it relates without departing from the spirit and the scope of the present invention.
Claims (16)
1. A security marking method comprising the steps of:
marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and by applying a solvent to the first and second marking fluids on the substrate.
marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and by applying a solvent to the first and second marking fluids on the substrate.
2. The method according to claim 1, wherein the first and second marking fluids are each applied in solvent vehicles.
3. The method according to claim 2, wherein the solvent is selected from alcohol, acetone, methylethylketone or a combination thereof.
4. A security marking method comprising the steps of:
marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from amino phthalides and quinazolines.
marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from amino phthalides and quinazolines.
5. The method according to claim 4, wherein the second marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
6. A security marking method comprising the steps of:
marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
7. The method according to claim 6, wherein the second marking fluid is selected from amino phthalides and quinazolines.
8. A security marking method comprising the steps of:
marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first and second marking fluids are each applied as micronized particles in an aqueous solution with a binder and by applying a solvent to the applied first and second marking fluids on the substrate.
marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first and second marking fluids are each applied as micronized particles in an aqueous solution with a binder and by applying a solvent to the applied first and second marking fluids on the substrate.
9. A security marking composition comprising:
a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from amino phthalides and quinazolines.
a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from amino phthalides and quinazolines.
10. The composition according to claim 9, further comprising a solvent.
11. The composition according to claim 9, wherein the second marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
12. The composition according to claim 9, wherein the first and second marking fluids are each applied in solvent vehicles.
13. The composition according to claim 12, wherein the solvent is selected from alcohol, acetone, methylethylketone or a combination thereof.
14. A security marking composition comprising:
a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
15. The composition according to claim 14, wherein the second marking fluid is selected from amino phthalides and quinazolines.
16. A security marking composition comprising:
a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first and second marking fluids each comprise micronized particles in an aqueous solution with a binder and each are activated by a solvent.
a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first and second marking fluids each comprise micronized particles in an aqueous solution with a binder and each are activated by a solvent.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/069,238 US5421869A (en) | 1993-05-28 | 1993-05-28 | Security marking method and composition |
| US069,238 | 1993-05-28 | ||
| PCT/US1994/003237 WO1994027829A1 (en) | 1993-05-28 | 1994-03-24 | A security marking method and composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2163083A1 CA2163083A1 (en) | 1994-12-08 |
| CA2163083C true CA2163083C (en) | 2003-06-24 |
Family
ID=22087634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002163083A Expired - Fee Related CA2163083C (en) | 1993-05-28 | 1994-03-24 | Security marking method and composition |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5421869A (en) |
| EP (1) | EP0703864B1 (en) |
| JP (1) | JPH09500585A (en) |
| AT (1) | ATE173679T1 (en) |
| AU (1) | AU6941694A (en) |
| CA (1) | CA2163083C (en) |
| DE (1) | DE69414848T2 (en) |
| WO (1) | WO1994027829A1 (en) |
Families Citing this family (50)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5516362A (en) * | 1993-05-28 | 1996-05-14 | Nocopi Technologies, Inc. | Security marking method and composition |
| US6027820A (en) * | 1996-01-11 | 2000-02-22 | Jps Packaging Co. | Continuous web registration |
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-
1993
- 1993-05-28 US US08/069,238 patent/US5421869A/en not_active Expired - Fee Related
-
1994
- 1994-03-24 JP JP7500602A patent/JPH09500585A/en active Pending
- 1994-03-24 CA CA002163083A patent/CA2163083C/en not_active Expired - Fee Related
- 1994-03-24 DE DE69414848T patent/DE69414848T2/en not_active Expired - Fee Related
- 1994-03-24 EP EP94917884A patent/EP0703864B1/en not_active Expired - Lifetime
- 1994-03-24 AT AT94917884T patent/ATE173679T1/en not_active IP Right Cessation
- 1994-03-24 AU AU69416/94A patent/AU6941694A/en not_active Abandoned
- 1994-03-24 WO PCT/US1994/003237 patent/WO1994027829A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09500585A (en) | 1997-01-21 |
| AU6941694A (en) | 1994-12-20 |
| ATE173679T1 (en) | 1998-12-15 |
| DE69414848T2 (en) | 1999-06-02 |
| DE69414848D1 (en) | 1999-01-07 |
| US5421869A (en) | 1995-06-06 |
| EP0703864B1 (en) | 1998-11-25 |
| CA2163083A1 (en) | 1994-12-08 |
| WO1994027829A1 (en) | 1994-12-08 |
| EP0703864A1 (en) | 1996-04-03 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |