Patent US4058475A successfully refreshed from Google Patents.
US4058475A
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US
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Liquid crystal compositions containing cyanocinnamic acid esters
Assignee: Dai Nippon Toryo Co Ltd
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Filing: 1976-06-03
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Granted: 1977-11-15
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Expires: 1996-06-03
Abstract
Abstract Liquid crystalline p-cyanocinnamic acid p'-n-alkoxyphenyl esters, and nematic liquid crystal compositions containing the same, useful for electro-optical devices, are described.
Inventors
- 👤 Toshio Jinnai
- 👤 Goro Matusmoto
- 👤 Kazuhito Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:27
CPC Classifications
C; C07; C07C; C07C255/00; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2014
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
28 words
A nematic liquid crystal composition comprising at least two cinnamic acid esters of the formula ##STR11## wherein R 1 is straight-chain alkyl of 4 to 8 carbon atoms.
Claim 2
Dependent Claim
28 words
A nematic liquid crystal composition comprising at least two cinnamic acid esters of the formula ##STR11## wherein R 1 is straight-chain alkyl of 4 to 8 carbon atoms.
Claim 3
Dependent Claim
55 words
A nematic liquid crystal composition comprising at least one cinnamic acid ester of the formula ##STR12## wherein R 1 is straight-chain alkyl of 4 to 8 carbon atoms, and at least one cinnamic acid ester of at least one of the formulae ##STR13## wherein R 2 is straight-chain alkyl of 3 to 8 carbon atoms.
Claim 4
Dependent Claim
55 words
A nematic liquid crystal composition comprising at least one cinnamic acid ester of the formula ##STR12## wherein R 1 is straight-chain alkyl of 4 to 8 carbon atoms, and at least one cinnamic acid ester of at least one of the formulae ##STR13## wherein R 2 is straight-chain alkyl of 3 to 8 carbon atoms.
Claim 5
Dependent Claim
32 words
A nematic liquid crystal composition in accordance with claim 2 comprising at least one cinnamic acid ester of said formula (I) and at least one cinnamic acid ester of said formula (II).
Claim 6
Dependent Claim
32 words
A nematic liquid crystal composition in accordance with claim 2 comprising at least one cinnamic acid ester of said formula (I) and at least one cinnamic acid ester of said formula (III).
Claim 7
Dependent Claim
32 words
A nematic liquid crystal composition in accordance with claim 2 comprising at least one cinnamic acid ester of said formula (I) and at least one cinnamic acid ester of said formula (IV).
Claim 8
Dependent Claim
42 words
A nematic liquid crystal composition in accordance with claim 2 comprising at least one cinnamic acid ester of said formula (I), at least one cinnamic acid ester of said formula (II) and at least one cinnamic acid ester of said formula (IV).
References Cited (Backward Citations)
US3927066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |