DE3175861D1 - Variable colour filters - Google Patents
Variable colour filtersInfo
- Publication number
- DE3175861D1 DE3175861D1 DE8181305300T DE3175861T DE3175861D1 DE 3175861 D1 DE3175861 D1 DE 3175861D1 DE 8181305300 T DE8181305300 T DE 8181305300T DE 3175861 T DE3175861 T DE 3175861T DE 3175861 D1 DE3175861 D1 DE 3175861D1
- Authority
- DE
- Germany
- Prior art keywords
- colour filters
- variable colour
- variable
- filters
- colour
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
- G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
- G02F1/13473—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells for wavelength filtering or for colour display without the use of colour mosaic filters
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133533—Colour selective polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1396—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/205,660 US4416514A (en) | 1980-11-10 | 1980-11-10 | Color filter |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3175861D1 true DE3175861D1 (en) | 1987-02-26 |
Family
ID=22763116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8181305300T Expired DE3175861D1 (en) | 1980-11-10 | 1981-11-06 | Variable colour filters |
Country Status (5)
Country | Link |
---|---|
US (1) | US4416514A (de) |
EP (1) | EP0052000B1 (de) |
JP (1) | JPS57150820A (de) |
CA (1) | CA1168489A (de) |
DE (1) | DE3175861D1 (de) |
Families Citing this family (79)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4617562A (en) * | 1983-04-11 | 1986-10-14 | Klotz Dell E | Multicolored liquid crystal display |
DE3380906D1 (de) * | 1983-04-21 | 1990-01-04 | Beckman Instruments Inc | Durchstimmbarer doppelbrechender filter mit fluessigkristallen. |
DE3486342T2 (de) * | 1983-09-26 | 1995-05-11 | Tektronix Inc | Schaltbarer Farbfilter und seine Verwendung in einer Anzeigevorrichtung mit sequentieller Rasterfolge und voller Farbwiedergabe. |
US4635051A (en) * | 1983-09-26 | 1987-01-06 | Tektronix, Inc. | High-speed electro-optical light gate and field sequential full color display system incorporating same |
US4758818A (en) * | 1983-09-26 | 1988-07-19 | Tektronix, Inc. | Switchable color filter and field sequential full color display system incorporating same |
EP0163366A1 (de) * | 1984-04-02 | 1985-12-04 | Tektronix, Inc. | Elektrooptische Sichtanzeige mit optimaler Durchlässigkeit und Blickwinkel |
US4611889A (en) * | 1984-04-04 | 1986-09-16 | Tektronix, Inc. | Field sequential liquid crystal display with enhanced brightness |
US4674841A (en) * | 1985-03-08 | 1987-06-23 | Tektronix, Inc. | Color filter switchable among three state via a variable retarder |
JP2556831B2 (ja) * | 1985-05-11 | 1996-11-27 | オリンパス光学工業株式会社 | 光学的ロ−パスフイルタ−及びこれを用いた撮像装置 |
CA1270583A (en) * | 1986-02-05 | 1990-06-19 | Frederick J. Porter | Color selectable liquid crystal display system |
US4867536A (en) * | 1986-02-05 | 1989-09-19 | Ford Motor Company | Color selectable liquid crystal display system |
DE3721751A1 (de) * | 1987-07-01 | 1989-01-12 | Eps Elektronik | Optoelektronisches filter vorzugsweise fuer videokameras |
CA1268271A (en) * | 1987-11-06 | 1990-04-24 | David M. Makow | Electro-optic animated displays and indicators |
US5142388A (en) * | 1987-11-10 | 1992-08-25 | Futaba Denshi Kogyo K.K. | Color display device having liquid crystal cell and fluorescent display with two different luminous sections |
US5298892A (en) * | 1988-07-21 | 1994-03-29 | Proxima Corporation | Stacked display panel construction and method of making same |
US5153568A (en) * | 1988-07-21 | 1992-10-06 | Proxima Corporation | Liquid crystal display panel system and method of using same |
US4974944A (en) * | 1988-07-21 | 1990-12-04 | Hewlett-Packard Company | Optical nonreciprocal device |
US5302946A (en) * | 1988-07-21 | 1994-04-12 | Leonid Shapiro | Stacked display panel construction and method of making same |
US5089810A (en) * | 1990-04-09 | 1992-02-18 | Computer Accessories Corporation | Stacked display panel construction and method of making same |
US5113270A (en) * | 1988-10-19 | 1992-05-12 | Fergason James L | Variable density light control apparatus |
US5523863A (en) * | 1988-10-19 | 1996-06-04 | Fergason; James L. | Controlled liquid crystal optical polarizer method and apparatus |
US5847790A (en) * | 1989-02-16 | 1998-12-08 | S.T. Lagerwall S.A.R.L. | Liquid crystal devices using a linear electro-optic effect |
USRE36654E (en) * | 1989-03-28 | 2000-04-11 | In Focus Systems, Inc. | Stacked LCD color display |
US4966441A (en) * | 1989-03-28 | 1990-10-30 | In Focus Systems, Inc. | Hybrid color display system |
US4917465A (en) * | 1989-03-28 | 1990-04-17 | In Focus Systems, Inc. | Color display system |
US5050965A (en) * | 1989-09-01 | 1991-09-24 | In Focus Systems, Inc. | Color display using supertwisted nematic liquid crystal material |
EP0388976A3 (de) * | 1989-03-28 | 1991-06-05 | In Focus Systems, Inc. | Farbanzeige |
US5264951A (en) * | 1990-04-09 | 1993-11-23 | Victor Company Of Japan, Ltd. | Spatial light modulator system |
JPH05307176A (ja) * | 1990-06-29 | 1993-11-19 | Proxima Corp | 表示装置及び表示方法 |
US5206749A (en) * | 1990-12-31 | 1993-04-27 | Kopin Corporation | Liquid crystal display having essentially single crystal transistors pixels and driving circuits |
US5751261A (en) * | 1990-12-31 | 1998-05-12 | Kopin Corporation | Control system for display panels |
US5661371A (en) * | 1990-12-31 | 1997-08-26 | Kopin Corporation | Color filter system for light emitting display panels |
US5444557A (en) * | 1990-12-31 | 1995-08-22 | Kopin Corporation | Single crystal silicon arrayed devices for projection displays |
US5122887A (en) * | 1991-03-05 | 1992-06-16 | Sayett Group, Inc. | Color display utilizing twisted nematic LCDs and selective polarizers |
US5347378A (en) * | 1991-04-04 | 1994-09-13 | Displaytech, Inc. | Fast switching color filters for frame-sequential video using ferroelectric liquid crystal color-selective filters |
JP2829149B2 (ja) * | 1991-04-10 | 1998-11-25 | シャープ株式会社 | 液晶表示装置 |
DE69226998T2 (de) * | 1991-07-19 | 1999-04-15 | Sharp Kk | Optisches Modulationselement und Vorrichtungen mit einem solchen Element |
US5184156A (en) * | 1991-11-12 | 1993-02-02 | Reliant Laser Corporation | Glasses with color-switchable, multi-layered lenses |
US6511187B1 (en) | 1992-02-20 | 2003-01-28 | Kopin Corporation | Method of fabricating a matrix display system |
JPH05241143A (ja) * | 1992-02-28 | 1993-09-21 | Dainippon Printing Co Ltd | 反射型液晶表示装置 |
US5315418A (en) * | 1992-06-17 | 1994-05-24 | Xerox Corporation | Two path liquid crystal light valve color display with light coupling lens array disposed along the red-green light path |
JP3329887B2 (ja) * | 1992-06-17 | 2002-09-30 | ゼロックス・コーポレーション | 2光路液晶ライトバルブカラー表示装置 |
US5325218A (en) * | 1992-12-31 | 1994-06-28 | Minnesota Mining And Manufacturing Company | Cholesteric polarizer for liquid crystal display and overhead projector |
US5371618A (en) * | 1993-01-05 | 1994-12-06 | Brite View Technologies | Color liquid crystal display employing dual cells driven with an EXCLUSIVE OR relationship |
DE4317140A1 (de) * | 1993-05-22 | 1994-11-24 | Andreas Biedermann | Variables Farbfilter |
FR2709854B1 (fr) * | 1993-09-07 | 1995-10-06 | Sextant Avionique | Dispositif de visualisation à couleurs optimisées. |
IL111108A (en) * | 1993-10-01 | 1998-08-16 | Hughes Training Inc | Defective color display with liquid crystal and active matrix with integral light reduction |
SG47360A1 (en) * | 1994-11-14 | 1998-04-17 | Hoffmann La Roche | Colour display with serially-connected lc filters |
US5689317A (en) * | 1995-03-22 | 1997-11-18 | Cambridge Research Instrumentation, Inc. | Tunable color filter |
US5999240A (en) | 1995-05-23 | 1999-12-07 | Colorlink, Inc. | Optical retarder stack pair for transforming input light into polarization states having saturated color spectra |
US5751384A (en) * | 1995-05-23 | 1998-05-12 | The Board Of Regents Of The University Of Colorado | Color polarizers for polarizing an additive color spectrum along a first axis and it's compliment along a second axis |
US5822021A (en) * | 1996-05-14 | 1998-10-13 | Colorlink, Inc. | Color shutter liquid crystal display system |
US6707516B1 (en) | 1995-05-23 | 2004-03-16 | Colorlink, Inc. | Single-panel field-sequential color display systems |
US6252638B1 (en) | 1995-05-23 | 2001-06-26 | Colorlink, Inc. | Color controllable illumination device, indicator lights, transmissive windows and color filters employing retarder stacks |
US6183091B1 (en) * | 1995-04-07 | 2001-02-06 | Colorlink, Inc. | Color imaging systems and methods |
US6882384B1 (en) * | 1995-05-23 | 2005-04-19 | Colorlink, Inc. | Color filters and sequencers using color selective light modulators |
US6417892B1 (en) | 1995-05-23 | 2002-07-09 | Colorlink, Inc. | Color filters, sequencers and displays using color selective light modulators |
US6049367A (en) * | 1995-05-23 | 2000-04-11 | Colorlink, Inc. | Polarization manipulating device modulator with retarder stack which preconditions light for modulation and isotropic states |
US5929946A (en) * | 1995-05-23 | 1999-07-27 | Colorlink, Inc. | Retarder stack for preconditioning light for a modulator having modulation and isotropic states of polarization |
US6273571B1 (en) | 1995-05-23 | 2001-08-14 | Colorlink, Inc. | Display architectures using an electronically controlled optical retarder stack |
JPH095745A (ja) * | 1995-06-07 | 1997-01-10 | Xerox Corp | カラー液晶ディスプレイ装置の光ファイバフェースプレート |
US5892559A (en) * | 1996-11-25 | 1999-04-06 | Colorlink, Inc. | Chromaticity compensating liquid crystal filter |
US6078303A (en) * | 1996-12-19 | 2000-06-20 | Colorado Microdisplay, Inc. | Display system having electrode modulation to alter a state of an electro-optic layer |
US5920298A (en) * | 1996-12-19 | 1999-07-06 | Colorado Microdisplay, Inc. | Display system having common electrode modulation |
US6046716A (en) * | 1996-12-19 | 2000-04-04 | Colorado Microdisplay, Inc. | Display system having electrode modulation to alter a state of an electro-optic layer |
SE511560C2 (sv) * | 1998-09-30 | 1999-10-18 | Richard Ryan Magnusson | Filteranordning och utrustning innefattande filteranordningen |
US6208393B1 (en) * | 1998-09-30 | 2001-03-27 | Intel Corporation | Liquid crystal color filter with integrated infrared blocking |
US6516661B1 (en) | 1999-01-28 | 2003-02-11 | Simmonds Precision Products, Inc. | Volume measurement system and method for volume element counting |
TW546555B (en) | 2000-05-16 | 2003-08-11 | Asulab Sa | Display assembly with chromatic contrast inversion |
EP1156360B1 (de) * | 2000-05-16 | 2017-01-18 | Asulab S.A. | Anzeigeeinheit mit chromatischer Kontrastumkehrung |
US7027224B2 (en) * | 2001-01-31 | 2006-04-11 | Sharp Laboratories Of America, Inc. | Wave plate mounting |
TW594148B (en) * | 2001-06-01 | 2004-06-21 | Univ Kent State Ohio | A color liquid crystal display of passive matrix design |
US7170679B2 (en) * | 2002-09-18 | 2007-01-30 | Vision Quest Lighting, Inc. | Optically active color filter |
US6888659B2 (en) * | 2002-12-10 | 2005-05-03 | Jds Uniphase Inc. | Polarization controller |
US20080094689A1 (en) * | 2004-11-12 | 2008-04-24 | Koninklijke Philips Electronics, N.V. | Bright Full Color Reflective Display |
JP4645714B2 (ja) * | 2008-09-19 | 2011-03-09 | 株式会社デンソー | 画像処理装置 |
JP6511528B2 (ja) | 2015-03-23 | 2019-05-15 | インテマティックス・コーポレーションIntematix Corporation | フォトルミネセンス・カラーディスプレイ |
US10901128B2 (en) * | 2015-06-26 | 2021-01-26 | The Arizona Board Of Regents On Behalf Of The University Of Arizona | Compound dichroic polarizers with wavelength dependent transmission axes |
US10866429B2 (en) * | 2017-01-24 | 2020-12-15 | Gary Sharp Innovations, Llc | Tunable color enhancement filter |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2493200A (en) * | 1946-05-31 | 1950-01-03 | Polaroid Corp | Variable polarizing color filter |
US2586635A (en) * | 1947-06-27 | 1952-02-19 | Rca Corp | Color control system |
US2834254A (en) * | 1953-10-22 | 1958-05-13 | Du Mont Allen B Lab Inc | Electronic color filter |
US3774988A (en) * | 1969-09-02 | 1973-11-27 | Polaroid Corp | Variable light-filtering device |
BE755563A (fr) * | 1969-09-02 | 1971-03-01 | Polaroid Corp | Dispositif de filtrage variable de lumiere |
US3703329A (en) * | 1969-12-29 | 1972-11-21 | Rca Corp | Liquid crystal color display |
US3936147A (en) * | 1972-11-22 | 1976-02-03 | Minolta Camera Kabushiki Kaisha | Variable characteristic light filter |
US4019808A (en) * | 1973-06-09 | 1977-04-26 | Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. | Arrangement for a polychrome display |
GB1469638A (en) * | 1973-07-18 | 1977-04-06 | Secr Defence | Liquid crystal display device |
US4017156A (en) * | 1974-02-28 | 1977-04-12 | Matsushita Electric Industrial Co., Ltd. | Electro-optical display device |
NL7408108A (nl) * | 1974-06-18 | 1975-12-22 | Philips Nv | Inrichting voor het weergeven van tekens voor- zien van een getwistnematisch vloeibaar kristal. |
US4068926A (en) * | 1974-11-13 | 1978-01-17 | Japan Suncrux Co., Ltd. | Liquid crystal display device for displaying colored patterns |
CH582894A5 (de) * | 1975-03-17 | 1976-12-15 | Bbc Brown Boveri & Cie | |
US4097128A (en) * | 1975-04-24 | 1978-06-27 | Tokyo Shibaura Electric Co., Ltd. | Liquid crystal color display devices |
JPS5259597A (en) * | 1975-11-11 | 1977-05-17 | Seiko Instr & Electronics Ltd | Display unit |
JPS533842A (en) * | 1976-07-01 | 1978-01-13 | Toshiba Corp | Liquid crystalline color indication element |
JPS53101296A (en) * | 1977-02-16 | 1978-09-04 | Seiko Epson Corp | Display unit |
US4097130A (en) * | 1977-03-11 | 1978-06-27 | General Electric Company | Multi-colored liquid crystal displays |
JPS5722218Y2 (de) * | 1977-11-24 | 1982-05-14 |
-
1980
- 1980-11-10 US US06/205,660 patent/US4416514A/en not_active Expired - Lifetime
-
1981
- 1981-11-06 DE DE8181305300T patent/DE3175861D1/de not_active Expired
- 1981-11-06 EP EP81305300A patent/EP0052000B1/de not_active Expired
- 1981-11-09 CA CA000389747A patent/CA1168489A/en not_active Expired
- 1981-11-10 JP JP56180275A patent/JPS57150820A/ja active Granted
Also Published As
Publication number | Publication date |
---|---|
US4416514A (en) | 1983-11-22 |
JPH0366646B2 (de) | 1991-10-18 |
EP0052000B1 (de) | 1987-01-21 |
CA1168489A (en) | 1984-06-05 |
EP0052000A3 (en) | 1983-01-12 |
EP0052000A2 (de) | 1982-05-19 |
JPS57150820A (en) | 1982-09-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3175861D1 (en) | Variable colour filters | |
GB2091541B (en) | Filter assembly | |
YU278881A (en) | Cigarett filter | |
JPS56121604A (en) | Improved filter | |
JPS5791711A (en) | Filter | |
GB2082398B (en) | Dielectric filter | |
JPS56111081A (en) | Filter | |
JPS56163706A (en) | Filter | |
GB2080695B (en) | Engine-fuel filter | |
GB2063617B (en) | Colour filter | |
GB2080141B (en) | Filter elements | |
GB2081544B (en) | Digital filters | |
GB2088678B (en) | Adaptive filter | |
JPS57122913A (en) | Filter | |
GB2088235B (en) | Self-cleaning filter | |
JPS56138380A (en) | Filter | |
GB2077559B (en) | Variable characteristic filters | |
JPS5759609A (en) | Filter | |
GB2077131B (en) | Filtration | |
GB2075328B (en) | Tobacco-smoke filter | |
GB2067087B (en) | Filter | |
DE3172589D1 (en) | Comb filter | |
JPS5721809A (en) | Filter | |
JPS5721810A (en) | Filter | |
GB2075698B (en) | Light filter |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |