US4512636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compounds
Assignee: Qinetiq Ltd
•
Filing: 1983-06-07
•
Granted: 1985-04-23
•
Expires: 2003-06-07
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-imidine 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 02:54
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 pyrimidine compound having the formula: ##STR67## wherein R 1 represents an alkyl group.
Claim 2
Dependent Claim
14 words
A pyrimidine compound having the formula: ##STR67## wherein R 1 represents an alkyl group.
Claim 3
Dependent Claim
23 words
A pyrimidine compound as defined in claim 1 in which R 1 represents an n-alkyl group having from 1 to 9 carbon atoms.
Claim 4
Dependent Claim
83 words
A liquid crystal device including two dielectric substrates at least one of which is optically transparent, a layer of liquid crystal material sandwiched between the substrate 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 having the formula: ##STR68## wherein R 1 represents an alkyl group.
Claim 5
Dependent Claim
83 words
A liquid crystal device including two dielectric substrates at least one of which is optically transparent, a layer of liquid crystal material sandwiched between the substrate 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 having the formula: ##STR68## wherein R 1 represents an alkyl group.
References Cited (Backward Citations)
US4062798A
Cited
US4261651A
Cited
US4348324A
Cited
US4322354A
Cited
US4344856A
Cited
GB2067188A
Cited
US4298528A
Cited
US4398803A
Cited
GB2086385A
Cited
US4415470A
Cited
US4325830A
Cited
EP0056501A2
Cited
US4439015A
Cited
EP0058512A1
Cited
US4419264A
Cited
EP0072204A1
Cited
DE3233641A1
Cited
EP0084194A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |