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US4698176A
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Heterocyclically substituted ethanes and their use in liquid crystal materials and devices
Assignee: Qinetiq Ltd
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Filing: 1986-09-29
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Granted: 1987-10-06
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Expires: 2006-09-29
Abstract
Abstract A heterocyclically substituted ethane having a formula: R.sub.1 -Cy-CH.sub.2.CH.sub.2 -A-R.sub.2 Formula 1 wherein A represents a heterocyclic ring selected from a trans 2,5 disubstituted 1,3 dioxan ring and a 2,5 disubstituted 1,3-pyrimidine ring; R 1 represents an alkyl group having from 1 to 15 carbon atoms and R 2 represents a group selected from hydrogen, alkyl having from 1 to 15 carbon atoms and alkoxy having from 1 to 15 carbon atoms provided that where A is a trans 2,5 disubstituted 1,3 dioxan ring R 2 is alkyl; and Cy represents a trans-1,4 disubstituted cyclohexane ring.
Inventors
- 👤 George W. Gray
- 👤 Beatrice M. Nicholas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:48
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C07C; C07C309/00; C07C31/00; C07C31/13; C07C31/133; C07C31/135; C07C31/1355; C07C47/00; C07C47/02; C07C47/105; C07C47/11; C07C53/00; C07C53/132; C07C53/134; C07D239/28; C07D239/32; C07D239/34; C07D319/00; C07D319/04; C07D319/06; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3402; C09K19/3441; C09K19/345; C09K19/3458; C09K2019/3422
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A heterocyclic compound having a formula: ##STR32## wherein ##STR33## represents a trans-1,4-disubstituted cyclohexyl ring; ##STR34## represents a 2,5 disubstituted 1,3 pyrimidine ring; R 1 represents an alkyl group having from 1 to 15 carbon atoms and R 2 represents a group selected from hydrogen, alkyl having from 1 to 15 carbon atoms and alkoxy having from 1 to 15 carbon atoms.
Claim 2
Dependent Claim
61 words
A heterocyclic compound having a formula: ##STR32## wherein ##STR33## represents a trans-1,4-disubstituted cyclohexyl ring; ##STR34## represents a 2,5 disubstituted 1,3 pyrimidine ring; R 1 represents an alkyl group having from 1 to 15 carbon atoms and R 2 represents a group selected from hydrogen, alkyl having from 1 to 15 carbon atoms and alkoxy having from 1 to 15 carbon atoms.
Claim 3
Dependent Claim
33 words
A compound as claimed in claim 1 wherein R 1 represents n-alkyl having from 1 to 10 carbon atoms and R 2 represents n-alkyl or n-alkoxy having from 1 to 10 carbon atoms.
Claim 4
Dependent Claim
13 words
A compound as claimed in claim 1 having a formula selected from: ##STR35##
Claim 5
Dependent Claim
26 words
A liquid crystal material which is a composition comprising a mixture of compounds at least one of which is a compound as claimed in claim 1.
Claim 6
Dependent Claim
71 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 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, wherein the liquid crystal material contains at least one compound 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 |
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| 3.5 Years (Year 4) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |