Patent US4769176A successfully refreshed from Google Patents.
US4769176A
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Biphenyl esters and liquid crystal materials and devices containing them
Assignee: BDH Ltd
•
Filing: 1986-01-21
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Granted: 1988-09-06
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Expires: 2006-01-21
Abstract
Abstract Biphenyl esters of formula (I), wherein formula (II) represents formula (III) or formula (IV), R 1 represents C 3 -C 12 alkyl, alkoxy, alkylcarbonyloxy, alkoxycarbonyl or alkoxycarbonyloxy, j is 0 or 1, R 2 represents C 3 -C 12 alkyl or alkoxy, one of Q 1 or Q 2 is fluorine and the other is hydrogen, provided that when j is 0 and formula (II) is formula (III) and both R 1 and R 2 are n-alkyl, then the total number of carbon atoms in R 1 and R 2 is more than 12. These compounds may be used as constituents of liquid crystal mixtures which show a room temperature ferroelectric smectic phase, and a number of such mixtures are described.
Inventors
- 👤 Madeline J. Bradshaw
- 👤 Edward P. Raynes
- 👤 David I. Bishop
- 👤 Ian C. Sage
- 👤 John A. Jenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:53
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068; C09K19/42; C09K19/46
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
68 words
A compound having a formula IA: ##STR76## wherein R 1 represents C 3 -C 12 alkyl or alkoxy, R 2 represents C 3 -C 12 alkyl, one of Q 1 or Q 2 is fluorine and the other is hydrogen, provided that when both R 1 and R 2 are n-alkyl then the total number of carbon atoms in R 1 and R 2 is more than 12.
Claim 2
Dependent Claim
68 words
A compound having a formula IA: ##STR76## wherein R 1 represents C 3 -C 12 alkyl or alkoxy, R 2 represents C 3 -C 12 alkyl, one of Q 1 or Q 2 is fluorine and the other is hydrogen, provided that when both R 1 and R 2 are n-alkyl then the total number of carbon atoms in R 1 and R 2 is more than 12.
Claim 3
Dependent Claim
15 words
A compound as claimed in claim 1, in which R 1 is n-alkyl or n-alkoxy.
Claim 4
Dependent Claim
24 words
A compound as claimed in claim 1 wherein R 1 or R 2 is a chiral group in an optically active or racemic form.
Claim 5
Dependent Claim
17 words
A compound as claimed in claim 1 having a formula selected from the group consisting of: ##STR77##
Claim 6
Dependent Claim
22 words
A liquid crystal material being a mixture of compounds at least one of which is a compound as claimed in claim 1.
Claim 7
Dependent Claim
22 words
A liquid crystal material being a mixture of compounds at least one of which is a compound as claimed in claim 2.
Claim 8
Dependent Claim
15 words
A liquid crystal material as claimed in claim 6, and wherein R 2 is n-alkyl.
Claim 9
Dependent Claim
22 words
A liquid crystal material being a mixture of compounds at least one of which is a compound as claimed in claim 3.
Claim 10
Dependent Claim
26 words
A liquid crystal material as claimed in claim 5 which contains in addition at least one optically active compound, the mixture having a ferroelectric smectic phase.
Claim 11
Dependent Claim
20 words
A liquid crystal material as claimed in claim 9, wherein the optically active compound is a derivative of lactic acid.
Claim 12
Dependent Claim
23 words
A liquid crystal material as claimed in claim 9, wherein the optically active compound is an ester of an optically active secondary alcohol.
Claim 13
Dependent Claim
17 words
A liquid crystal electro optical device which incorporates a liquid crystal material as claimed in claim 5.
Claim 14
Dependent Claim
17 words
A liquid crystal electro optical device which incorporates a liquid crystal material as claimed in claim 9.
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |