US4911863A
Expired / Lapsed
US
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Alkylbyphenyloxyacetic acid esters and their use in smectic liquid crystal materials
Assignee: Qinetiq Ltd
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Filing: 1987-02-22
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Granted: 1990-03-27
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Expires: 2007-02-22
Abstract
Abstract The invention relates to ferroelectric smectic liquid crystal mixtures and compounds. The invention also relates to electro-optical devices incorporating these mixtures.
Inventors
- 👤 Ian C. Sage
- 👤 John A. Jenner
- 👤 Hans A. Kurmeier
- 👤 Pauluth Detlef
- 👤 Claus Escher
- 👤 Eike Poetsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:31
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/612; C07C69/616; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C07C255/00; C07C69/66; C07C69/67; C07C69/675; C07C69/68; C07C69/74; C07C69/75; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/126; C09K19/20; C09K19/2007; C09K19/2021; C09K19/2028; C09K19/30; C09K19/3001; C09K19/3003; C09K19/34; C09K19/3402; C09K19/3441; C09K19/3444; C09K19/345; C09K19/3458; C09K19/3463; C09K19/3475; C09K2019/3422
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
A ferroelectric smectic liquid crystal material, being a mixture of compounds, wherein at least one of said compounds is a compound of formula: ##STR93## wherein R 1 is C 1 -C 12 straight chain or branched alkyl or alkoxy, R 2 is C 4 -C 12 chiral alkyl, and the phenyl rings may carry one lateral fluorine substituent, and at least one of said compounds is a compound which shows a smectic phase, the mixture having a composition: compound(s) of formula I: 1-50 wt % compound(s) showing a smectic phase: 50-99 wt %
Claim 2
Dependent Claim
93 words
A ferroelectric smectic liquid crystal material, being a mixture of compounds, wherein at least one of said compounds is a compound of formula: ##STR93## wherein R 1 is C 1 -C 12 straight chain or branched alkyl or alkoxy, R 2 is C 4 -C 12 chiral alkyl, and the phenyl rings may carry one lateral fluorine substituent, and at least one of said compounds is a compound which shows a smectic phase, the mixture having a composition: compound(s) of formula I: 1-50 wt % compound(s) showing a smectic phase: 50-99 wt %
Claim 3
Dependent Claim
11 words
A material according to claim 1 wherein R 2 is 1-methylheptyl.
Claim 4
Dependent Claim
17 words
A material according to claim 1 or 2 wherein R 1 is C 3 -C 12 n-alkyl.
Claim 5
Dependent Claim
26 words
A material according to claim 1 wherein R 2 is optically active 1-methylheptyl and R 1 is selected from the group consisting of n-decyl and n-nonyloxy.
Claim 6
Dependent Claim
36 words
A material according to claim 1 wherein at least one of the compounds shows a smectic phase has a formula: ##STR94## wherein R A and R B are independently C 1 -C 12 alkyl or alkoxy.
Claim 7
Dependent Claim
25 words
A material according to claim 5 wherein R A is n-alkyl or n-alkoxy and the fluorine is at the ring position adjacent to the --COO--link.
Claim 8
Dependent Claim
16 words
A liquid crystal electro-optic display device comprising a liqiud crystal material as claimed in claim 1.
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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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |