US3960751A
Expired / Lapsed
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Electro-optical display element
Assignee: Panasonic Holdings Corp
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Filing: 1974-09-16
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Granted: 1976-06-01
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Expires: 1994-09-16
Abstract
Abstract An electro-optical element comprising a nematic liquid crystal composition and at least one compound represented by the formula:
Inventors
- 👤 Akio Moriyama
- 👤 Masakazu Fukai
- 👤 Hiroshi Tatsuta
- 👤 Hiroaki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:39
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/28; C09K19/603
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
An electro-optical element comprising a nematic liquid crystal composition and at least one compound represented by the formula ##SPC11## wherein R 1 is n-alkyl radical having from 5 to 20 carbon atoms and R 2 is an n-alkyl radical having from 4 to 20 carbon atoms.
Claim 2
Dependent Claim
46 words
An electro-optical element comprising a nematic liquid crystal composition and at least one compound represented by the formula ##SPC11## wherein R 1 is n-alkyl radical having from 5 to 20 carbon atoms and R 2 is an n-alkyl radical having from 4 to 20 carbon atoms.
Claim 3
Dependent Claim
51 words
The electro-optical element according to claim 1, wherein at least one of said compounds has the formula ##SPC12## where R 1 is an n-alkyl radical having from 5 to 12 carbon atoms and is added to said nematic liquid crystal composition in an amount of from 0.5 to 5% by weight.
Claim 4
Dependent Claim
51 words
The electro-optical element according to claim 1, wherein at least one of said compounds having the formula ##SPC13## where R 2 is an n-alkyl radical having from 4 to 8 carbon atoms, and is added to said nematic liquid crystal composition in an amount of from 0.5 to 5% by weight.
Claim 5
Dependent Claim
17 words
The electro-optical element according to claim 1 wherein said compound is 1,4-bisdodecylaminoanthraquinone and further comprising 4-(dimethylamino) azobenzene.
Claim 6
Dependent Claim
19 words
The electro-optical element according to claim 1 wherein said compound is 1,8-bisoctylaminoanthraquinone and further comprising 1,4-bisphenylaminoanthraquinone and 4-(dimethylamino) azobenzene.
Claim 7
Dependent Claim
18 words
The electro-optical element according to claim 1 wherein said compound is 1,4-bisoctylaminoanthraquinone and further comprising 2-hydroxynaphthalene-1-azo-1'-benzene-4'-azobenzene and phenylazoresorcine.
Claim 8
Dependent Claim
112 words
An electro-optical display device comprising two parallel transparent members whose inner surfaces have been coated with transparent electrodes; an electro-optical element comprising a nematic liquid crystal composition and at least one compound represented by the formula ##SPC14## wherein R 1 is an n-alkyl radical having from 5 to 20 carbon atoms and R 2 is an n-alkyl radical having from 4 to 20 carbon atoms, said electro-optical element being interposed between said electrodes and having all its molecules in their quiescent state, nonelectrically aligned perpendicular or parallel to such facing surfaces, and means for selectively applying an electric field across said electro-optical element through said electrodes to exceed a threshold electric field.
Claim 9
Dependent Claim
112 words
An electro-optical display device comprising two parallel transparent members whose inner surfaces have been coated with transparent electrodes; an electro-optical element comprising a nematic liquid crystal composition and at least one compound represented by the formula ##SPC14## wherein R 1 is an n-alkyl radical having from 5 to 20 carbon atoms and R 2 is an n-alkyl radical having from 4 to 20 carbon atoms, said electro-optical element being interposed between said electrodes and having all its molecules in their quiescent state, nonelectrically aligned perpendicular or parallel to such facing surfaces, and means for selectively applying an electric field across said electro-optical element through said electrodes to exceed a threshold electric field.
Claim 10
Dependent Claim
75 words
An electro-optical display device according to claim 7, wherein said electro-optical element comprises a nematic liquid crystal composition with net positive dielectric anisotropy which has a homogeneous arrangement and a mixture of dyes consisting of 1,4-bisoctylaminoanthraquinone, 2-hydroxynaphthalene-1-azo-1'-benzene-4'-azobenzene and phenylazoresorcine and further comprising at last one polarizer located adjacent to said transparent members; said nematic liquid crystal composition comprising a nematic liquid crystal with negative dielectric anisotropy and a nematic liquid crystal with positive dielectric anisotropy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |