US4696549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compounds containing a fluorobiphenylyl group and their use in liquid crystal material and devices
Assignee: Qinetiq Ltd
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Filing: 1985-12-05
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Granted: 1987-09-29
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Expires: 2005-12-05
Abstract
Abstract Novel terphenyls having a relatively high clearing point and which are suitable for use in liquid crystal materials or in the preparation of compounds for use in such material are characterized by a formula: ##STR1## wherein: R 1 is selected from H, alkyl, alkoxy, alkylcarbonyl, alkylcarbonyloxy and alkoxycarbonyloxy; R 2 is selected from H, alkyl, alkoxy; X 1 is selected from H and fluorine; X 2 is selected from H and fluorine; and ##STR2## provided that one of X 1 and X 2 is fluorine. Compounds wherein ##STR3## are generally useful as liquid crystal compounds.
Inventors
- 👤 Lawrence Kam Ming Chan
- 👤 George W. Gray
- 👤 Kenneth J. Toyne
- 👤 David Lacey
- 👤 Rudolf Eidenschink
- 👤 Michael Romer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:53
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/35; C07C17/357; C07C25/00; C07C25/18; C07C35/00; C07C35/48; C07C35/50; C07C43/00; C07C43/02; C07C43/20; C07C43/225; C07C43/23; C07C49/00; C07C49/76; C07C49/80; C07C49/813; C07C49/84; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/30; C09K19/3001; C09K19/3003; C09K19/3098; C09K2019/121; C09K2019/123
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A liquid crystal device including two dielectric substrates at least one of which is optically transparent, a layer of liquid 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-optical effect therein, characterized in that the liquid material is a mixture of compounds at least one of which is a compound having the formula: ##STR43## wherein: R 1 is selected from alkyl, alkoxy, and alkylcarbonyl; R 2 is selected from alkyl and alkoxy; X 1 is selected from H and fluorine; X 2 is selected from H and fluorine; and ##STR44## provided that one of X 1 and X 2 is fluorine.
Claim 2
Dependent Claim
125 words
A liquid crystal device including two dielectric substrates at least one of which is optically transparent, a layer of liquid 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-optical effect therein, characterized in that the liquid material is a mixture of compounds at least one of which is a compound having the formula: ##STR43## wherein: R 1 is selected from alkyl, alkoxy, and alkylcarbonyl; R 2 is selected from alkyl and alkoxy; X 1 is selected from H and fluorine; X 2 is selected from H and fluorine; and ##STR44## provided that one of X 1 and X 2 is fluorine.
Claim 3
Dependent Claim
10 words
A device as claimed in claim 2 and wherein ##STR45##
Claim 4
Dependent Claim
14 words
A deivce as claimed in claim 2, wherein R 1 is alkyl or alkoxy.
Claim 5
Dependent Claim
18 words
A device as claimed in claim 3 and wherein X 1 is hydrogen and X 2 is fluorine.
Claim 6
Dependent Claim
36 words
A device as claimed in claim 4 and wherein R 1 is n-alkyl or n-alkoxy having from 1 to 12 carbon atoms and R 2 is n-alkyl or n-alkoxy having from 1 to 12 carbon atoms.
Claim 7
Dependent Claim
14 words
A device as claimed in claim 1 which is a twisted nematic effect device.
Claim 8
Dependent Claim
13 words
A device as claimed in claim 1 which is a Freedericksz effect device.
Claim 9
Dependent Claim
17 words
A device as claimed in claim 1 which is a chlolesteric to nematic phase change effect device.
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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) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |