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US4076646A
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Liquid crystal composition for field effect display devices
Assignee: Hitachi Ltd
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Filing: 1976-09-08
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Granted: 1978-02-28
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Expires: 1996-09-08
Abstract
Abstract A liquid crystal composition for field effect display devices, comprising a nematic liquid crystal composition having a substantially positive dielectric anisotropy and at least one of o-terphenyl and m-terphenyl. This composition sufficiently functions at 2 V, because the threshold voltage of the liquid crystal composition can be made about 1.5 V.
Inventors
- 👤 Fumio Nakano
- 👤 Hisao Yokokura
- 👤 Kenji Murao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:46
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/44; C09K19/02; C09K19/0208
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
29 words
A liquid crystal composition for field effect display devices, which comprises a nematic liquid crystal composition having a positive dielectric anisotropy and at least one of o-terphenyl and m-terphenyl.
Claim 2
Dependent Claim
29 words
A liquid crystal composition for field effect display devices, which comprises a nematic liquid crystal composition having a positive dielectric anisotropy and at least one of o-terphenyl and m-terphenyl.
Claim 3
Dependent Claim
41 words
A liquid crystal composition for field effect display devices, which comprises 100 parts by weight of a nematic liquid crystal composition having a positive dielectric anisotropy and 2 to 10 parts by weight of at least one of o-terphenyl and m-terphenyl.
Claim 4
Dependent Claim
41 words
A liquid crystal composition for field effect display devices, which comprises 100 parts by weight of a nematic liquid crystal composition having a positive dielectric anisotropy and 2 to 10 parts by weight of at least one of o-terphenyl and m-terphenyl.
Claim 5
Dependent Claim
40 words
A liquid crystal composition according to claim 2, wherein said nematic liquid crystal composition comprises a mixture consisting essentially of approximately 91% by weight of equal parts by weight of p-methoxybenzylidene-p'-butylaniline, p-ethoxy-benzylidene-p'-butylaniline, and p-ethoxybenzylidene-p'-heptylaniline and 9% by weight of p-nitrobenzylidene-aminobenzene.
Claim 6
Dependent Claim
31 words
A liquid crystal composition according to claim 3, wherein said nematic liquid crystal composition comprises an admixture of approximately 91% by weight of said mixture and 9% by weight of n-butylbenzylidene-p-nitroanailine.
Claim 7
Dependent Claim
36 words
A liquid crystal composition according to claim 3, wherein said nematic liquid crystal composition comprises an admixture of approximately 84% by weight of said mixture, 8% by weight of 4,4'-bis(hexylazoxy)-azoxybenzene and 8% by weight of p-ethoxybenzylidene-p'-cyanoaniline.
Claim 8
Dependent Claim
30 words
A liquid crystal composition according to claim 3, wherein said nematic liquid crystal composition comprises an admixture of 91% by weight of said mixture and 9% by weight of p-N,N-dimethylcyanoaniline.
Claim 9
Dependent Claim
36 words
The liquid crystal composition according to claim 2, wherein said nematic liquid crystal composition contains 45 Mol. % of p-n-heptyl-p'-cyanobiphenyl, 20 Mol. % of p-n-amyloxy-p'-cyanobiphenyl, 15 Mol. % of p-n-heptyloxy-p'-cyanobiphenyl and 20 Mol. % of p-n-octyloxy-p'-cyanobiphenyl.
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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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |