Patent US4630897A successfully refreshed from Google Patents.
US4630897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compounds
Assignee: Qinetiq Ltd
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Filing: 1985-02-04
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Granted: 1986-12-23
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Expires: 2005-02-04
Abstract
Abstract A novel liquid crystal compound has a formula: ##STR1## where: ##STR2## is a trans-2,5-disubstituted-1,3-dioxan ring or a 2,5-disubstituted-1,3-pyrimidine ring ##STR3## is a 1,4-disubstituted benzene ring optionally containing one or more F, Cl or CH 3 groups as lateral substituents; R 1 is an alkyl group; and X is a terminal group selected from H, CN, Cl, F and R 2 where R 2 is selected from alkyl R 3 , alkoxy OR 3 , alkylcarbonyloxy OCOR 3 and alkoxycarbonyloxy OCOOR 3 .
Inventors
- 👤 Beatrice M. Andrews
- 👤 Neil Carr
- 👤 George W. Gray
- 👤 Christine Hogg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:14
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C07D313/00; C07D313/02; C07D313/06; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3402; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3469; C09K2019/3422
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
A dioxan compound having the formula: ##STR67## where R 1 represents an alkyl group.
Claim 2
Dependent Claim
14 words
A dioxan compound having the formula: ##STR67## where R 1 represents an alkyl group.
Claim 3
Dependent Claim
21 words
A dioxan compound as claimed in claim 1 where R 1 represents an n-alkyl group having 1 to 9 carbon atoms.
Claim 4
Dependent Claim
87 words
A liquid crystal device of the type that uses a nematic liquid crystal material, including two dielectric substrates at least one of which is optically transparent, a layer of liquid crystal material sandwiched between the substrates, and electrodes on the inner surfaces of the substrates to enable an electric field to be applied across the layer of liquid crystal material to provide an electro-optic effect therein, the improvement in which the liquid crystal is a material which includes at least one compound as claimed in claim 1.
Claim 5
Dependent Claim
87 words
A liquid crystal device of the type that uses a nematic liquid crystal material, including two dielectric substrates at least one of which is optically transparent, a layer of liquid crystal material sandwiched between the substrates, and electrodes on the inner surfaces of the substrates to enable an electric field to be applied across the layer of liquid crystal material to provide an electro-optic effect therein, the improvement in which the liquid crystal is a material which includes at least one compound as claimed in claim 2.
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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) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |