US2718181A - Contact printer - Google Patents
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- US2718181A US2718181A US246669A US24666951A US2718181A US 2718181 A US2718181 A US 2718181A US 246669 A US246669 A US 246669A US 24666951 A US24666951 A US 24666951A US 2718181 A US2718181 A US 2718181A
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- Prior art keywords
- cover
- transparent
- base
- glass
- cushion
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/02—Exposure apparatus for contact printing
Definitions
- This invention relates to contact printers and like devices for making photographic prints from negatives; in particular, it relates to an improvement in the type of contact printer shown in the co-pending application of Harold R. Gullixson, Serial No. 246,668, filed concurrently herewith.
- a printer embodying a pneumatic cushion.
- the pneumatic cushion serves to hold a print and a negative, or a master sheet and a negative, in close contact with each other by pressing them against a transparent print supporting surface, such as a sheet of glass.
- the mask can be secured to the opposite or underside of the transparent print supporting surface.
- the underside of the glass sheet is not readily accessible.
- the glass sheet is located in the base of the printer, and is disposed above the light source. This horizontal disposition of the glass sheet, together with the fact that it is enclosed within a base, makes the undersurface of the glass sheet comparatively inaccessible; furthermore, if openings were provided in the base to improve accessibility, the mask could not be positioned with any accuracy due to the arrangement of the parts.
- Another object of this invention is to provide a transparent print supporting surface which can be moved with the cover Without destroying the pressure engagement between the transparent surface and the pneumatic cushion, to the end that the undersurface of the transparent print supporting means is readily accessible.
- the present invention contemplates a hinged mounting of the transparent print supporting means on the base together with latching means for securing the transparent means to the cover after pressure engagement has been obtained.
- latching means for securing the transparent means to the cover after pressure engagement has been obtained.
- Still another object of the present invention is to provide means which automatically prevent the release of said latching means when the cover is in elevated posi-V tion.
- the transparent print supporting means cannot drop away from the cover and break.
- Fig. l is a side elevation of this invention as applied to a printer of the type shown and described in the aforesaid pending application, the sheathing of the base and the end plate of the cover being partially broken away so as to more clearly illustrate the underlying parts;
- Fig. 2 is a plan sectional view taken along line 2-2 of Fig. 1;
- Fig. 3 is an elevation similar to Fig. l but showing the parts in changed position, the cover being raised;
- Fig. 4 is an enlarged detail section taken along line 4-4 of Fig. 2 showing the cover in operative position, with the latch engaged, and
- Fig. 5 is a view similar to Fig. 4, but showing the latch disengaged.
- the printer comprises a base 10 having a top surface 11.
- a cover 12 is hingedly mounted on the base, by means of a hinge rod 13.
- the latter is supported in a pair of hinge brackets 14 which are mounted on suitable structural members, not shown.
- the cover includes a pair of side plates 15 through which the hinge rod 13 passes. Tail strips 16 are secured to the side plates 15 to reinforce the end plates at the pivot point and to provide a means to which a counterbalancing spring can be anchored.
- the top surface 11 is provided with an opening which is deiined by a supporting frame 17 made of channel members.
- a suitable light source not shown, is disposed beneath the frame.
- a transparent print supporting surface in the form of a sheet of glass 18 is disposed in the opening and above the supporting frame 17, the frame forming a support for the glass, and a rubber gasket 19 being interposed between the two.
- the glass is hingedly connected at its rear edge to the hinge rod 13 by means of brackets 20.
- the transparent print supporting means 18 includes marginally disposed channel members which form a frame 21 which engage the edge of the glass sheet and which provide means to which the brackets 20 may be attached. Thus, although in its normal position, the glass 18 rests on the supporting frame 17, it may be raised with the cover so as to make accessible its undersurface.
- Means are provided for engaging glass 18 by the cover so that the two may be raised as a unit without destroying the pressure engagement between the glass and a pneumatic cushion 30 which is vcarried by the cover.
- the frame 21 is provided with pins 22 which are engaged by latching means in the form of a bell crank lever 23.
- the latter is pivotally mounted on a bracket 24 disposed in the cover 12.
- the bell crank lever is provided with a hooked end 2S which is adapted to engage the pins 22.
- An operating shaft 26 is suitably journaled in the cover and carries cams 27 which engage the bell crank levers 23 to cause the hooked ends thereof to be rotated into or out of engagement with the pins 22.
- the operating shaft at its outer end, is bent over and provided with a knob 28.
- a member projects from the side of the cover to provide a rest 29 on which the control knob may rest to maintain the cam in the Fig. 5 or unlatched position.
- This locking means comprises a blocking member 31 which is pivotally mounted on bracket 24, and which is provided with a depending portion 32 which projects downwardly through the'cover and engages the top surface 11 of the base.
- the locking lever is elevated, so as to permit movement of the bell crank in and out of latched position.
- the blocking lever drops downwardly into blocking position in which it engages the bell crank and blocks the same, thereby locking in latched position.
- a spring 33 extends between the bell crank lever 23 and the blocking lever 31 and serves the double purpose of biasing the bell crank lever into unlatched position, and of biasing the blocking lever into locking position.
- the cover 12 includes a pneumatic cushion which, when inated, is bowed outwardly to provide a convex surface.
- the glass 18 rests on the frame 17 in a horizontal position.
- the contact between the cushion' and the glass causes the cushion to be compressed. Since the compression of the cushion requires considerable force even though a low pressure cushion is used, clamping means are provided to engage the cover and to draw it downwardly through the last few degrees of its movement into its operative position.
- This clamping means comprises a clamping bar 35 which is suitably journaled in the base and to which is secured a pair of cranks 36.
- S-shaped hooks 37 are pivotally mounted on the cranks by means of pivot pins 38. This arrangement is doubled on both sides of the machine, only one of the clamping means being shown in Figs. l and 2.
- a stop plate 39 secured to the side wall of the base, is engaged by the hook 37 and serves to maintain the same in an upright position so that rotation of the crank, when in its down position as shown in Fig. 1, will cause the hook to move downwardly.
- the hook engages a flange portion 4G of the cover 12, with the result that the cover is urged downwardly with considerable force into its operative position.
- the S-shape of the hook permits the crank to be swung into an overcenter position so that the cover will remain clamped in its operative position.
- a spring 41 extends between the tail of the clamp and the crank which serves to urge the hook forwardly into engagement with the flange portion and into engagement with the stop plate 39.
- a pin 42 limits the counterclockwise movement of the hook with respect to the crank so that when the clamping shaft 35 is rotated 180 in the clockwise direction from the Fig. l position, the hook will be rotated backwardly and downwardly to a point where it is retracted within the base.
- the timer of the print is set for the short period, and the entire print is automatically exposed for this short period.
- the control knob 28 is rotated in the counterclockwise direction from its Fig. 5 position to the Fig. 4 position which causes bell crank leversv 23 to engage the pins 22, thereby latching the glass to the cover.
- the clamping shaft 35 is rotated to release and retract the hooks 37.
- this does not release the pressure engagement between the cushion and the glass due to the latched condition of these parts.
- the cover may now be elevated into its Fig. 3 position.
- the elevation of the cover automatically causes the blocking levers 31 to engage the bell crank levers, thereby locking the latch in their latched positions. This avoids inadvertent release which might cause the glass to break.
- masking means may be secured to the underside of the glass 18 by suitable means, such as pressure sensitive tape. Then, the cover is brought back down into its operative position, and the clamp shaft 35 is rotated so as to secure the cover in this position. The timer is then set for the remainder of the exposure period, so that the unmasked portion of the negative and print may receive the desired additional exposure.
- the glass In releasing the parts, after exposure, the glass is unlatched prior to release of the clamping means so as to achieve a gradual release of the pressure engagement.
- the additional exposure of the unmasked portion can be effected during the first exposure period, and themask removed during the interval prior to the second exposure period.
- a contact printer comprising a hase, transparent print supporting means normally disposed on said base, a cover movably mounted on said base and having cushion means for cooperation with said transparent means, hinge means connecting said cover to said base, said transparent means being hingedly mounted on said cover so that said transparent means may be moved with said cover away from said base, clamping means for drawing said cover into operative position against said base so that said cushion means is forced into and maintained in pressure engagement with said transparent means, and latching means mounted on said cover for engaging said transparent means when said cover is clamped in its operative position so as to maintain said transparent means and said cushion in pressure engagement with each other after said clamping means is released to permit said cover and transparent means to be removed from said base without destroying said pressure engagement.
- a contact printer comprising a base having an opening formed in its top surface, transparent print supporting means normally disposed in said opening, pivot means mounted on said base, a cover hingedly mounted on said pivot means and having cushion means for cooperation with said transparent means, clamping means for drawing said cover into operative position against said base so that said cushion means may be forced into and maintained in pressure engagement with said transparent means, said transparent means being hingedly mounted on said pivot means for movement with said cover into a raised position, and latching means mounted on said cover for engaging said transparent means when said cover is clamped in its operative position so as to maintain said transparent means and said cushion in pressure engagement wtih each other after said clamping means is Y released to permit said cover and transparent means to be raised as a unit.
- a contact printer as claimed in claim 2 having means for locking said latching means in latched position when said cover is raised.
- a contact printer as claimed in claim 2 in which said latching means comprises a latching member mounted in said cover and movable between a latched and a released position, and locking means engaging said pivoted latching member when it is in its latched position to maintain the same in said latched position.
- said locking means comprises a blocking member mounted for engagement with said latching member and movable between an operative position and an inoperative position, said blocking member including a portion projecting through said cover into engagement with said base whereby said locking member is maintained in its inoperative position by the engagement of said projecting portion with said base when said cover is in its operative position, said blocking member being movable into its operative position as movement of said cover away from said base permits said projecting portion to be projected through said cover to a greater extent.
Description
Sept 20, 1955 H. R. GULLlxsoN ETAL 2,718,181
CONTACT PRINTER Filed Sept. 14, 1951 2 Sheets-Sheet l hw 1 w Sept. 20, 1955 H. R, GULLlxsoN ErAL 2,718,181
CONTACT PRINTER Filed Sept. 14, 1951 2 Sheets-Sheet 2 United States Patent O CONTACT PRINTER Harold R. Gullixson, Evanston, and Ored L. Smith, Western Springs, Ill., assignors to Ditto, Incorporated, Chicago, Ill., a corporation of West Virginia Application September 14, 1951, Serial No. 246,669
Claims. (Cl. 95-73) This invention relates to contact printers and like devices for making photographic prints from negatives; in particular, it relates to an improvement in the type of contact printer shown in the co-pending application of Harold R. Gullixson, Serial No. 246,668, filed concurrently herewith.
In that application, there is disclosed a printer embodying a pneumatic cushion. The pneumatic cushion serves to hold a print and a negative, or a master sheet and a negative, in close contact with each other by pressing them against a transparent print supporting surface, such as a sheet of glass.
In making such prints, it is often desired to expose one portion of the print and negative for a longer period of time than other portions in order to bring out high lights or otherwise to improve the quality of the print or master sheet. This can be accomplished by masking out a portion of the negative. To do this the exposure period is divided into two sub-periods, and the mask is placed over the negative during the interval between these two subperiods.
To avoid disturbing the relationship between the print and the negative, which would occur if the pneumatic cushion were released, the mask can be secured to the opposite or underside of the transparent print supporting surface. However, in certain types of printers, including that shown in the aforesaid pending application, the underside of the glass sheet is not readily accessible. The glass sheet is located in the base of the printer, and is disposed above the light source. This horizontal disposition of the glass sheet, together with the fact that it is enclosed within a base, makes the undersurface of the glass sheet comparatively inaccessible; furthermore, if openings were provided in the base to improve accessibility, the mask could not be positioned with any accuracy due to the arrangement of the parts.
It is an object of the present invention to provide a printer in which the undersurface of the transparent print supporting surface is readily accessible so that masking means may be applied thereto.
Another object of this invention is to provide a transparent print supporting surface which can be moved with the cover Without destroying the pressure engagement between the transparent surface and the pneumatic cushion, to the end that the undersurface of the transparent print supporting means is readily accessible.
The present invention contemplates a hinged mounting of the transparent print supporting means on the base together with latching means for securing the transparent means to the cover after pressure engagement has been obtained. Thus, when it is desired to apply masking means, the cover and the transparent means can be raised as a unit.
Still another object of the present invention is to provide means which automatically prevent the release of said latching means when the cover is in elevated posi-V tion. Thus, the transparent print supporting means cannot drop away from the cover and break.
Patented Sept. 2-0, 19,55
Other objects, features and advantages will become apparent as the description proceeds.
With reference now to the drawings in which like reference numerals designate like parts:
Fig. l is a side elevation of this invention as applied to a printer of the type shown and described in the aforesaid pending application, the sheathing of the base and the end plate of the cover being partially broken away so as to more clearly illustrate the underlying parts;
Fig. 2 is a plan sectional view taken along line 2-2 of Fig. 1;
Fig. 3 is an elevation similar to Fig. l but showing the parts in changed position, the cover being raised;
Fig. 4 is an enlarged detail section taken along line 4-4 of Fig. 2 showing the cover in operative position, with the latch engaged, and
Fig. 5 is a view similar to Fig. 4, but showing the latch disengaged.
The printer comprises a base 10 having a top surface 11. A cover 12 is hingedly mounted on the base, by means of a hinge rod 13. The latter is supported in a pair of hinge brackets 14 which are mounted on suitable structural members, not shown. The cover includes a pair of side plates 15 through which the hinge rod 13 passes. Tail strips 16 are secured to the side plates 15 to reinforce the end plates at the pivot point and to provide a means to which a counterbalancing spring can be anchored. The function and relationship of the foregoing elements is pointed out in greater detail in the aforesaid copending application to which reference is hereby made.
The top surface 11 is provided with an opening which is deiined by a supporting frame 17 made of channel members. A suitable light source, not shown, is disposed beneath the frame. A transparent print supporting surface in the form of a sheet of glass 18 is disposed in the opening and above the supporting frame 17, the frame forming a support for the glass, and a rubber gasket 19 being interposed between the two.
The glass is hingedly connected at its rear edge to the hinge rod 13 by means of brackets 20. The transparent print supporting means 18 includes marginally disposed channel members which form a frame 21 which engage the edge of the glass sheet and which provide means to which the brackets 20 may be attached. Thus, although in its normal position, the glass 18 rests on the supporting frame 17, it may be raised with the cover so as to make accessible its undersurface.
Means are provided for engaging glass 18 by the cover so that the two may be raised as a unit without destroying the pressure engagement between the glass and a pneumatic cushion 30 which is vcarried by the cover. For this purse, the frame 21 is provided with pins 22 which are engaged by latching means in the form of a bell crank lever 23. The latter is pivotally mounted on a bracket 24 disposed in the cover 12. The bell crank lever is provided with a hooked end 2S which is adapted to engage the pins 22. This latching mecha-v nism, together with its associated parts are doubled on both sides of the cover, and since they are identical to each other, only one will be described in detail.
An operating shaft 26 is suitably journaled in the cover and carries cams 27 which engage the bell crank levers 23 to cause the hooked ends thereof to be rotated into or out of engagement with the pins 22. The operating shaft, at its outer end, is bent over and provided with a knob 28. A member projects from the side of the cover to provide a rest 29 on which the control knob may rest to maintain the cam in the Fig. 5 or unlatched position.
In order to prevent inadvertent release of the latch when the cover is in its raised position, means are provided for locking the latch in its latched position. This locking means comprises a blocking member 31 which is pivotally mounted on bracket 24, and which is provided with a depending portion 32 which projects downwardly through the'cover and engages the top surface 11 of the base. As shown in Figs. 3 and 4, when the cover is down in its operative position, the locking lever is elevated, so as to permit movement of the bell crank in and out of latched position. However, when the cover is raised, the blocking lever drops downwardly into blocking position in which it engages the bell crank and blocks the same, thereby locking in latched position. Thus, even though the knob 28 is manipulated when the cover is raised, the bell crank lever cannot be rotated. A spring 33 extends between the bell crank lever 23 and the blocking lever 31 and serves the double purpose of biasing the bell crank lever into unlatched position, and of biasing the blocking lever into locking position.
As indicated above, the cover 12 includes a pneumatic cushion which, when inated, is bowed outwardly to provide a convex surface. In normal position, the glass 18 rests on the frame 17 in a horizontal position. As the cover is lowered into its operative position, as shown in Fig. 5, the contact between the cushion' and the glass causes the cushion to be compressed. Since the compression of the cushion requires considerable force even though a low pressure cushion is used, clamping means are provided to engage the cover and to draw it downwardly through the last few degrees of its movement into its operative position. This clamping means comprises a clamping bar 35 which is suitably journaled in the base and to which is secured a pair of cranks 36. S-shaped hooks 37 are pivotally mounted on the cranks by means of pivot pins 38. This arrangement is doubled on both sides of the machine, only one of the clamping means being shown in Figs. l and 2. A stop plate 39, secured to the side wall of the base, is engaged by the hook 37 and serves to maintain the same in an upright position so that rotation of the crank, when in its down position as shown in Fig. 1, will cause the hook to move downwardly. At this time, the hook engages a flange portion 4G of the cover 12, with the result that the cover is urged downwardly with considerable force into its operative position. The S-shape of the hook permits the crank to be swung into an overcenter position so that the cover will remain clamped in its operative position.
The operation of the clamping means is described in greater detail in the aforesaid co-pending application. It will be observed that a spring 41 extends between the tail of the clamp and the crank which serves to urge the hook forwardly into engagement with the flange portion and into engagement with the stop plate 39. A pin 42 limits the counterclockwise movement of the hook with respect to the crank so that when the clamping shaft 35 is rotated 180 in the clockwise direction from the Fig. l position, the hook will be rotated backwardly and downwardly to a point where it is retracted within the base.
To summarize the operation, a print and negative, after being aligned, are rst laid on the glass 18, the cover at this time being raised. Then the cover is lowered and the clamping shaft 35 is rotated so as to engage the cover and draw it down into its operative position, against the pressure of the cushion. Now the glass and the cushion are in pressure engagement with each other.
Assuming that it is desired to expose one portion of the print for a short period and the other portion for a longer period, the timer of the print is set for the short period, and the entire print is automatically exposed for this short period. Then, the control knob 28 is rotated in the counterclockwise direction from its Fig. 5 position to the Fig. 4 position which causes bell crank leversv 23 to engage the pins 22, thereby latching the glass to the cover. Then the clamping shaft 35 is rotated to release and retract the hooks 37. However, this does not release the pressure engagement between the cushion and the glass due to the latched condition of these parts.
The cover may now be elevated into its Fig. 3 position. The elevation of the cover automatically causes the blocking levers 31 to engage the bell crank levers, thereby locking the latch in their latched positions. This avoids inadvertent release which might cause the glass to break.
When the cover is in its raised position, masking means may be secured to the underside of the glass 18 by suitable means, such as pressure sensitive tape. Then, the cover is brought back down into its operative position, and the clamp shaft 35 is rotated so as to secure the cover in this position. The timer is then set for the remainder of the exposure period, so that the unmasked portion of the negative and print may receive the desired additional exposure.
In releasing the parts, after exposure, the glass is unlatched prior to release of the clamping means so as to achieve a gradual release of the pressure engagement.
If desired, the additional exposure of the unmasked portion can be effected during the first exposure period, and themask removed during the interval prior to the second exposure period.
The disclosure of the aforementioned copending application, insofar as consistent, is hereby incorporated in this application by reference.
Although only a preferred embodiment of our invention is shown and described herein, it will be understood that various modifications and changes may be made without departing from the spirit of our invention as pointed out in the appended claims.
l; A contact printer comprising a hase, transparent print supporting means normally disposed on said base, a cover movably mounted on said base and having cushion means for cooperation with said transparent means, hinge means connecting said cover to said base, said transparent means being hingedly mounted on said cover so that said transparent means may be moved with said cover away from said base, clamping means for drawing said cover into operative position against said base so that said cushion means is forced into and maintained in pressure engagement with said transparent means, and latching means mounted on said cover for engaging said transparent means when said cover is clamped in its operative position so as to maintain said transparent means and said cushion in pressure engagement with each other after said clamping means is released to permit said cover and transparent means to be removed from said base without destroying said pressure engagement.
2. A contact printer comprising a base having an opening formed in its top surface, transparent print supporting means normally disposed in said opening, pivot means mounted on said base, a cover hingedly mounted on said pivot means and having cushion means for cooperation with said transparent means, clamping means for drawing said cover into operative position against said base so that said cushion means may be forced into and maintained in pressure engagement with said transparent means, said transparent means being hingedly mounted on said pivot means for movement with said cover into a raised position, and latching means mounted on said cover for engaging said transparent means when said cover is clamped in its operative position so as to maintain said transparent means and said cushion in pressure engagement wtih each other after said clamping means is Y released to permit said cover and transparent means to be raised as a unit.
3. A contact printer as claimed in claim 2 having means for locking said latching means in latched position when said cover is raised.
4. A contact printer as claimed in claim 2 in which said latching means comprises a latching member mounted in said cover and movable between a latched and a released position, and locking means engaging said pivoted latching member when it is in its latched position to maintain the same in said latched position.
5. A contact printer as claimed in claim 4 in which said locking means comprises a blocking member mounted for engagement with said latching member and movable between an operative position and an inoperative position, said blocking member including a portion projecting through said cover into engagement with said base whereby said locking member is maintained in its inoperative position by the engagement of said projecting portion with said base when said cover is in its operative position, said blocking member being movable into its operative position as movement of said cover away from said base permits said projecting portion to be projected through said cover to a greater extent.
References Cited in the le of this patent UNITED STATES PATENTS 966,499 Ware Aug. 9, 1910 2,494,282 Campbell Jan. 10, 1950
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US246669A US2718181A (en) | 1951-09-14 | 1951-09-14 | Contact printer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US246669A US2718181A (en) | 1951-09-14 | 1951-09-14 | Contact printer |
Publications (1)
Publication Number | Publication Date |
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US2718181A true US2718181A (en) | 1955-09-20 |
Family
ID=22931681
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US246669A Expired - Lifetime US2718181A (en) | 1951-09-14 | 1951-09-14 | Contact printer |
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US (1) | US2718181A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2957400A (en) * | 1958-06-06 | 1960-10-25 | Robertson Photo Mechanix Inc | Photographic printing apparatus |
US4218137A (en) * | 1979-06-27 | 1980-08-19 | Eastman Kodak Company | Isolating member for use in contact printing |
US4305656A (en) * | 1979-06-27 | 1981-12-15 | Eastman Kodak Company | Videodisc replication method |
US4508802A (en) * | 1982-06-11 | 1985-04-02 | E. I. Du Pont De Nemours And Company | Multiple registration and imaging process to form a set of registered imaged elements |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US966499A (en) * | 1909-06-28 | 1910-08-09 | Arnold A Bowhay | Resiliently-cushioned printing-frame for photoprinting-cabinets. |
US2494282A (en) * | 1947-06-19 | 1950-01-10 | James T Campbell | Photographic printing frame |
-
1951
- 1951-09-14 US US246669A patent/US2718181A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US966499A (en) * | 1909-06-28 | 1910-08-09 | Arnold A Bowhay | Resiliently-cushioned printing-frame for photoprinting-cabinets. |
US2494282A (en) * | 1947-06-19 | 1950-01-10 | James T Campbell | Photographic printing frame |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2957400A (en) * | 1958-06-06 | 1960-10-25 | Robertson Photo Mechanix Inc | Photographic printing apparatus |
US4218137A (en) * | 1979-06-27 | 1980-08-19 | Eastman Kodak Company | Isolating member for use in contact printing |
US4305656A (en) * | 1979-06-27 | 1981-12-15 | Eastman Kodak Company | Videodisc replication method |
US4508802A (en) * | 1982-06-11 | 1985-04-02 | E. I. Du Pont De Nemours And Company | Multiple registration and imaging process to form a set of registered imaged elements |
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