Patent US5599478A successfully refreshed from Google Patents.
US5599478A
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US
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Compensator for a liquid crystal display
Assignee: Eneos Corp
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Filing: 1995-08-14
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Granted: 1997-02-04
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Expires: 2015-08-14
Abstract
Abstract According to the present invention there is provided a compensator for a liquid crystal display superior in the color compensating performance, capable of making color compensation of a high-speed STN-LCD and capable of freely changing the value of wavelength dispersion. The compensator is obtained by using a liquid crystalline polyester which contains 4-hydroxycinnamic acid units and catechol units as constituent units.
Inventors
- 👤 Takuya Matumoto
- 👤 Tadahiro Kaminade
- 👤 Nishimura Suzushi
- 👤 Shigeki Takigawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:59
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809; G02B; G02B5/00; G02B5/30; G02B5/3083; G02F1/13363; C09K2323/00; C09K2323/03; G02F2202/00; G02F2202/40; G02F2413/00; G02F2413/01; G02F2413/08; G02F2413/15
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
A compensator for a liquid cystal display comprising a transparent substrate and a liquid crystalline polyester layer laminated thereon, said liquid crystalline polyester layer being obtained by fixing the orientation of a liquid crystalline polyester exhibiting a twisted nematic orientation in the state of liquid crystal, which a glassy state at a temperature below the liquid crystal transition point thereof, and containing 3 to 40 mol % of 4-hydroxycinnamic acid units represented by formula (I) and 15 to 40 mol % of catechol units represented by formula (II): where X and Y are each independently a hydrogen atom, Cl, Br, or an alkyl group having 1 to 4 carbon atoms, the ratio of the value of birefringence for light having a wavelength of 450 nm, Δn (450 nm), to the value of birefringence for light having a wavelength of 600 nm, Δn (600 nm), namely (Δn (450 nm)/Δn (600 nm)), being in the range from 1.14 to 1.30.
Claim 2
Dependent Claim
158 words
A compensator for a liquid cystal display comprising a transparent substrate and a liquid crystalline polyester layer laminated thereon, said liquid crystalline polyester layer being obtained by fixing the orientation of a liquid crystalline polyester exhibiting a twisted nematic orientation in the state of liquid crystal, which a glassy state at a temperature below the liquid crystal transition point thereof, and containing 3 to 40 mol % of 4-hydroxycinnamic acid units represented by formula (I) and 15 to 40 mol % of catechol units represented by formula (II): where X and Y are each independently a hydrogen atom, Cl, Br, or an alkyl group having 1 to 4 carbon atoms, the ratio of the value of birefringence for light having a wavelength of 450 nm, Δn (450 nm), to the value of birefringence for light having a wavelength of 600 nm, Δn (600 nm), namely (Δn (450 nm)/Δn (600 nm)), being in the range from 1.14 to 1.30.
Claim 3
Dependent Claim
16 words
A compensator as set forth in claim 1 wherein said liquid crystalline polyester is optically active.
Claim 4
Dependent Claim
28 words
A compensator as set forth in claim 1, wherein said liquid crystalline polyester is in the form of a liquid crystalline polymer composition containing an optically active compound.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-04 | 2000-08-05 | 2001-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-04 | 2004-08-05 | 2005-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-04 | 2008-08-05 | 2009-02-04 | $7700.00 | Window Closed / Lapsed |