Patent US4852977A successfully refreshed from Google Patents.
US4852977A
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19 -hydroxy carboxylic acid derivatives suitable for use in liquid crystal materials and devices
Assignee: Qinetiq Ltd
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Filing: 1985-11-08
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Granted: 1989-08-01
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Expires: 2005-11-08
Abstract
Abstract Novel lactic acid derivatives which may be used as a component of a ferroelectric smectic liquid crystal mixture, which derivatives have the general formula: ##STR1## in which R 1 is alkyl or alkoxy and R 2 is alkyl. Liquid crystalline compositions containing these compounds are also described.
Inventors
- 👤 Lawrence K. M. Chan
- 👤 David Coates
- 👤 Peter A. Gemmell
- 👤 George W. Gray
- 👤 David Lacey
- 👤 Kenneth J. Toyne
- 👤 Daniel J. S. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:07
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/12; C09K19/126; C09K19/2028; C09K19/22; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068; C09K19/32; C09K19/42; C09K19/50; C09K19/586
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
A lactic acid derivative, useful as a host or dopant in a ferroelectric smectic liquid crystal mixture, having the formula: ##STR194## wherein R 1 is C 1 -C 20 alkyl or C 1 -C 20 alkoxy and R 2 is C 1 -C 20 alkyl, the total number of carbon atoms in R 1 plus R 2 being at most 25.
Claim 2
Dependent Claim
61 words
A lactic acid derivative, useful as a host or dopant in a ferroelectric smectic liquid crystal mixture, having the formula: ##STR194## wherein R 1 is C 1 -C 20 alkyl or C 1 -C 20 alkoxy and R 2 is C 1 -C 20 alkyl, the total number of carbon atoms in R 1 plus R 2 being at most 25.
Claim 3
Dependent Claim
32 words
A lactic acid derivative according to claim 1, wherein R 1 is n-alkyl or n-alkoxy containing 5 to 12 carbon atoms, and R 2 is n-alkyl containing 1 to 5 carbon atoms.
Claim 4
Dependent Claim
23 words
A lactic acid derivative according to claim 1, wherein R 1 is n-octyl or n-octyloxy and R 2 is methyl, ethyl or n-butyl.
Claim 5
Dependent Claim
12 words
A lactic acid derivative according to claim 1 in a racemic form.
Claim 6
Dependent Claim
65 words
A liquid crystal composition consisting of a mixture of at least two compounds at least one of which is a compound of the formula: ##STR195## wherein R 1 is C 1 -C 20 alkyl or C 1 -C 20 alkoxy and R 2 is C 1 -C 20 alkyl, the total number of carbon atoms in R 1 plus R 2 being at most 25.
Claim 7
Dependent Claim
65 words
A liquid crystal composition consisting of a mixture of at least two compounds at least one of which is a compound of the formula: ##STR195## wherein R 1 is C 1 -C 20 alkyl or C 1 -C 20 alkoxy and R 2 is C 1 -C 20 alkyl, the total number of carbon atoms in R 1 plus R 2 being at most 25.
Claim 8
Dependent Claim
24 words
A liquid crystal composition according to claim 5, wherein the compound functions as a dopant to induce a ferroelectric phase in a smectic host.
Claim 9
Dependent Claim
101 words
An electro-optic device which consists of two substrates, at least one of which is optically transparent, electrodes on the inner surfaces of the substrates and a layer of a liquid crystalline material sandwiched between the substrates, wherein the liquid crystalline material is a mixture of at least two compounds at least one of which is a compound of the formula: ##STR196## wherein R 1 is C 1 -C 20 alkyl or C 1 -C 20 alkoxy and R 2 is C 1 -C 20 alkyl, the total number of carbon atoms in R 1 plus R 2 being at most 25.
Claim 10
Dependent Claim
101 words
An electro-optic device which consists of two substrates, at least one of which is optically transparent, electrodes on the inner surfaces of the substrates and a layer of a liquid crystalline material sandwiched between the substrates, wherein the liquid crystalline material is a mixture of at least two compounds at least one of which is a compound of the formula: ##STR196## wherein R 1 is C 1 -C 20 alkyl or C 1 -C 20 alkoxy and R 2 is C 1 -C 20 alkyl, the total number of carbon atoms in R 1 plus R 2 being at most 25.
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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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |