US4923633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compounds containing two or more chiral centers
Assignee: Qinetiq Ltd
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Filing: 1987-11-30
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Granted: 1990-05-08
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Expires: 2007-11-30
Abstract
Abstract A compound suitable for use in a ferroelectric smectic liquid crystal composition having a structure which contains two chiral centers derived from alpha hydroxy carboxylic acid groups and having the formula: ##STR1## wherein R 1 is n-alkoxy containing 1-12 carbo atoms and R 2 is n-alkyl containing 1-12 carbon atoms. Methods of preparation and details of liquid crystal mixtures containing these compounds are described.
Inventors
- 👤 George W. Gray
- 👤 David Lacey
- 👤 Kenneth J. Toyne
- 👤 David Coates
- 👤 Adam Jackson
- 👤 Richard M. Scrowston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:37
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/2028; C09K19/12; C09K19/126; C09K19/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A compound suitable for use in a ferroelectric smectic liquid crystal composition having a structure which contains two chiral centers derived from alpha-hydroxy carboxylic acid groups and having the formula: ##STR87## wherein R 1 is n-alkoxy containing from 1 to 12 carbons atoms and R 2 is n-alkyl containing from 1 to 12 carbons atoms.
Claim 2
Dependent Claim
55 words
A compound suitable for use in a ferroelectric smectic liquid crystal composition having a structure which contains two chiral centers derived from alpha-hydroxy carboxylic acid groups and having the formula: ##STR87## wherein R 1 is n-alkoxy containing from 1 to 12 carbons atoms and R 2 is n-alkyl containing from 1 to 12 carbons atoms.
Claim 3
Dependent Claim
17 words
A compound as claimed in claim 1 wherein R 1 contains from 5 to 12 carbon atoms.
Claim 4
Dependent Claim
16 words
A compound as claimed in claim 14 wherein R 1 is n-C 8 H 17 O.
Claim 5
Dependent Claim
20 words
A compound as claimed in claim 1, 2 or 3 wherein R 2 contains from 1 to 5 carbon atoms.
Claim 6
Dependent Claim
12 words
A compound as claimed in claim 4 wherein R 2 is ethyl.
Claim 7
Dependent Claim
24 words
A ferroelectric liquid crystal composition which is a mixture of compounds at least one of which is a compound as claimed in claim 1.
References Cited (Backward Citations)
US4852977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |