CH581841A5 - - Google Patents
Info
- Publication number
- CH581841A5 CH581841A5 CH993174A CH993174A CH581841A5 CH 581841 A5 CH581841 A5 CH 581841A5 CH 993174 A CH993174 A CH 993174A CH 993174 A CH993174 A CH 993174A CH 581841 A5 CH581841 A5 CH 581841A5
- Authority
- CH
- Switzerland
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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- 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
- G02F1/13—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
-
- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133631—Birefringent elements, e.g. for optical compensation with a spatial distribution of the retardation value
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/01—Function characteristic transmissive
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/02—Function characteristic reflective
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/34—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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/03—Number of plates being 3
-
- 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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/08—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates with a particular optical axis orientation
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3416273A GB1469638A (en) | 1973-07-18 | 1973-07-18 | Liquid crystal display device |
Publications (1)
Publication Number | Publication Date |
---|---|
CH581841A5 true CH581841A5 (xx) | 1976-11-15 |
Family
ID=10362170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH993174A CH581841A5 (xx) | 1973-07-18 | 1974-07-18 |
Country Status (8)
Country | Link |
---|---|
US (1) | US4232948A (xx) |
JP (1) | JPS6029091B2 (xx) |
CA (1) | CA1037151A (xx) |
CH (1) | CH581841A5 (xx) |
DE (1) | DE2434624A1 (xx) |
FR (1) | FR2238200B1 (xx) |
GB (1) | GB1469638A (xx) |
NL (1) | NL186199C (xx) |
Families Citing this family (67)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5227789U (xx) * | 1975-08-18 | 1977-02-26 | ||
US4394069A (en) * | 1979-06-05 | 1983-07-19 | Beckman Instruments, Inc. | Liquid crystal tuned birefringent filter |
US4547043A (en) * | 1980-07-25 | 1985-10-15 | Penz Perry A | Stacked LCD graphics display |
US4364039A (en) * | 1980-07-25 | 1982-12-14 | Texas Instruments Incorporated | Stacked electro-optic display |
JPS5613220U (xx) * | 1980-07-31 | 1981-02-04 | ||
US4416514A (en) * | 1980-11-10 | 1983-11-22 | Polaroid Corporation | Color filter |
US4523848A (en) * | 1981-10-01 | 1985-06-18 | National Research Development Corporation | Polariscope |
US4636786A (en) * | 1982-12-20 | 1987-01-13 | Motorola, Inc. | Electrooptic ceramic display and method for making same |
US4630040A (en) * | 1983-03-31 | 1986-12-16 | Motorola, Inc. | Variable color electrooptic display |
DE3380906D1 (de) * | 1983-04-21 | 1990-01-04 | Beckman Instruments Inc | Durchstimmbarer doppelbrechender filter mit fluessigkristallen. |
US4582396A (en) * | 1983-05-09 | 1986-04-15 | Tektronix, Inc. | Field sequential color display system using optical retardation |
DE3486342T2 (de) * | 1983-09-26 | 1995-05-11 | Tektronix Inc | Schaltbarer Farbfilter und seine Verwendung in einer Anzeigevorrichtung mit sequentieller Rasterfolge und voller Farbwiedergabe. |
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 |
US4813769A (en) * | 1985-11-05 | 1989-03-21 | Itt Defense Communications, A Division Of Itt Corporation | Liquid crystal wave division device |
EP0246842B1 (en) * | 1986-05-19 | 1998-09-23 | Seiko Epson Corporation | A liquid crystal display device |
US5136405A (en) * | 1986-05-19 | 1992-08-04 | Seiko Epson Corporation | Liquid crystal display device with compensator having Δnxd and twist angle calculated using the liquid crystal's parameters |
JPS63116122A (ja) * | 1986-11-04 | 1988-05-20 | Toyota Motor Corp | 液晶素子 |
CA1268271A (en) * | 1987-11-06 | 1990-04-24 | David M. Makow | Electro-optic animated displays and indicators |
KR960007791B1 (ko) * | 1987-12-10 | 1996-06-12 | 세이꼬 엡슨 가부시끼가이샤 | 전기 광학 소자 |
US5119220A (en) * | 1988-01-28 | 1992-06-02 | Sanyo Electric Co., Ltd. | Liquid crystal display device with a phase plate for shadow compensation |
US4936654A (en) * | 1988-01-28 | 1990-06-26 | Sanyo Electric Co., Ltd. | Liquid crystal display device |
US5082353A (en) * | 1988-05-11 | 1992-01-21 | Kabushiki Kaisha Toshiba | Liquid-crystal display apparatus |
US5153568A (en) * | 1988-07-21 | 1992-10-06 | Proxima Corporation | Liquid crystal display panel system and method of using same |
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 |
US5113271A (en) * | 1988-08-10 | 1992-05-12 | Fergason James L | Light blocking and vision restoration apparatus with glint control |
US5414546A (en) * | 1988-08-10 | 1995-05-09 | Fergason; James L. | Dynamic optical notch filter |
US4988167A (en) * | 1988-08-10 | 1991-01-29 | Fergason James L | Light blocking and vision restoration apparatus with glint control |
US4917465A (en) * | 1989-03-28 | 1990-04-17 | In Focus Systems, Inc. | Color display system |
USRE36654E (en) * | 1989-03-28 | 2000-04-11 | In Focus Systems, Inc. | Stacked LCD color display |
US5050965A (en) * | 1989-09-01 | 1991-09-24 | In Focus Systems, Inc. | Color display using supertwisted nematic liquid crystal material |
JPH0351418U (xx) * | 1989-09-27 | 1991-05-20 | ||
JP2971945B2 (ja) * | 1989-10-30 | 1999-11-08 | ザ ユニバーシティ オブ コロラド ファウンデーション,インコーポレイテッド | 強誘電性液晶調整可能フィルタ及び色発生 |
US5469279A (en) * | 1989-10-30 | 1995-11-21 | The University Of Colorado Foundation, Inc. | Chiral smectic liquid crystal multipass optical filters including a variable retarder (and a variable isotropic spacer) |
US5231521A (en) * | 1989-10-30 | 1993-07-27 | The University Of Colorado Foundation, Inc. | Chiral smectic liquid crystal polarization interference filters |
US5381253A (en) * | 1991-11-14 | 1995-01-10 | Board Of Regents Of University Of Colorado | Chiral smectic liquid crystal optical modulators having variable retardation |
US5243455A (en) * | 1990-05-11 | 1993-09-07 | The University Of Colorado Foundation, Inc. | Chiral smectic liquid crystal polarization interference filters |
EP0470817A3 (en) * | 1990-08-09 | 1992-11-25 | Seiko Epson Corporation | Liquid crystal electro-optical device |
JPH0833531B2 (ja) * | 1991-03-29 | 1996-03-29 | 株式会社日立製作所 | 液晶表示素子 |
US5184156A (en) * | 1991-11-12 | 1993-02-02 | Reliant Laser Corporation | Glasses with color-switchable, multi-layered lenses |
US5377026A (en) * | 1992-09-02 | 1994-12-27 | Liu; Jian-Yu | Modulator using the linear electro-optic effect of liquid crystals |
US5325218A (en) * | 1992-12-31 | 1994-06-28 | Minnesota Mining And Manufacturing Company | Cholesteric polarizer for liquid crystal display and overhead projector |
US5583678A (en) * | 1993-03-12 | 1996-12-10 | Casio Computer Co., Ltd. | Color liquid crystal display apparatus |
US5442468A (en) * | 1993-06-21 | 1995-08-15 | Arshach-Applied Science Cars Ltd. | Apparatus for producing color effects |
US5432624A (en) * | 1993-12-03 | 1995-07-11 | Reliant Technologies, Inc. | Optical display unit in which light passes a first cell, reflects, then passes a second cell |
GB2286056A (en) * | 1994-01-21 | 1995-08-02 | Sharp Kk | Electrically controllable wavelength filter |
US5724112A (en) * | 1994-03-28 | 1998-03-03 | Casio Computer Co., Ltd. | Color liquid crystal apparatus |
US6115014A (en) * | 1994-12-26 | 2000-09-05 | Casio Computer Co., Ltd. | Liquid crystal display by means of time-division color mixing and voltage driving methods using birefringence |
US5689317A (en) * | 1995-03-22 | 1997-11-18 | Cambridge Research Instrumentation, Inc. | Tunable color filter |
US6882384B1 (en) * | 1995-05-23 | 2005-04-19 | Colorlink, Inc. | Color filters and sequencers using color selective light modulators |
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 |
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 |
US6183091B1 (en) * | 1995-04-07 | 2001-02-06 | Colorlink, Inc. | Color imaging systems and methods |
US6252638B1 (en) | 1995-05-23 | 2001-06-26 | Colorlink, Inc. | Color controllable illumination device, indicator lights, transmissive windows and color filters employing retarder stacks |
US6417892B1 (en) | 1995-05-23 | 2002-07-09 | Colorlink, Inc. | Color filters, sequencers and displays using color selective light modulators |
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 |
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 |
GB2318878A (en) * | 1996-10-31 | 1998-05-06 | Sharp Kk | Reflective liquid crystal device |
US5892559A (en) * | 1996-11-25 | 1999-04-06 | Colorlink, Inc. | Chromaticity compensating liquid crystal filter |
US6100944A (en) * | 1997-10-10 | 2000-08-08 | Boulder Nonlinear Systems, Inc. | Polarizing interferometer using multiorder and zero order birefringence switches |
US7170679B2 (en) * | 2002-09-18 | 2007-01-30 | Vision Quest Lighting, Inc. | Optically active color filter |
EP3707538A4 (en) * | 2017-11-09 | 2021-08-18 | The Regents of The University of Michigan | TENSIONABLE POLARIZER |
US11388350B2 (en) | 2019-12-27 | 2022-07-12 | The Regents Of The University Of Michigan | Autonomous glare removal technique |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3501219A (en) * | 1966-09-08 | 1970-03-17 | Texas Instruments Inc | Color control for dynamic displays |
GB1270811A (en) * | 1968-03-30 | 1972-04-19 | Hitachi Ltd | Color modulating method and device |
US3731986A (en) * | 1971-04-22 | 1973-05-08 | Int Liquid Xtal Co | Display devices utilizing liquid crystal light modulation |
US3785721A (en) * | 1971-07-15 | 1974-01-15 | Int Liquid Xtal Co | Display devices utilizing liquid crystal light modulation with varying colors |
US3756694A (en) * | 1971-09-09 | 1973-09-04 | Sperry Rand Corp | Electric field controllable birefringence liquid crystal media and optical display devices for use thereof |
US3806227A (en) * | 1972-09-06 | 1974-04-23 | Siemens Ag | Arrangement for a multi-color data indication |
US3784280A (en) * | 1973-01-02 | 1974-01-08 | Gen Electric | Light-dark reflective liquid crystal display |
-
1973
- 1973-07-18 GB GB3416273A patent/GB1469638A/en not_active Expired
-
1974
- 1974-07-12 US US05/488,069 patent/US4232948A/en not_active Expired - Lifetime
- 1974-07-17 JP JP49082689A patent/JPS6029091B2/ja not_active Expired
- 1974-07-17 NL NLAANVRAGE7409684,A patent/NL186199C/xx not_active IP Right Cessation
- 1974-07-17 FR FR7424879A patent/FR2238200B1/fr not_active Expired
- 1974-07-17 CA CA204,917A patent/CA1037151A/en not_active Expired
- 1974-07-18 CH CH993174A patent/CH581841A5/xx not_active IP Right Cessation
- 1974-07-18 DE DE2434624A patent/DE2434624A1/de not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
NL186199C (nl) | 1990-10-01 |
US4232948A (en) | 1980-11-11 |
FR2238200B1 (xx) | 1983-04-08 |
GB1469638A (en) | 1977-04-06 |
CA1037151A (en) | 1978-08-22 |
NL7409684A (nl) | 1975-01-21 |
FR2238200A1 (xx) | 1975-02-14 |
JPS6029091B2 (ja) | 1985-07-09 |
DE2434624A1 (de) | 1975-02-06 |
JPS5072645A (xx) | 1975-06-16 |
NL186199B (nl) | 1990-05-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PL | Patent ceased |