Patent US4594465A successfully refreshed from Google Patents.
US4594465A
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Compounds containing a fluorobiphenylyl group
Assignee: Qinetiq Ltd
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Filing: 1984-07-19
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Granted: 1986-06-10
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Expires: 2004-07-19
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 characterised 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## is selected from ##STR3## and ##STR4## provided that one of X 1 and X 2 is fluroine. Compounds wherein ##STR5## is ##STR6## or ##STR7## are generally useful as liquid crystal compounds.
Inventors
- 👤 Lawrence Kam Ming Chan
- 👤 George W. Gray
- 👤 Kenneth J. Toyne
- 👤 David Lacey
- 👤 Rudolf Eidensschink
- 👤 Michael Romer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:16
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: 6
Claim 1
Independent Claim
63 words
A terphenyl having a formula: ##STR48## 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 ##STR49## is selected from ##STR50## ##STR51## and ##STR52## provided that one of X 1 and X 2 is fluorine.
Claim 2
Dependent Claim
63 words
A terphenyl having a formula: ##STR48## 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 ##STR49## is selected from ##STR50## ##STR51## and ##STR52## provided that one of X 1 and X 2 is fluorine.
Claim 3
Dependent Claim
10 words
A terphenyl as claimed in claim 1 and wherein ##STR53##
Claim 4
Dependent Claim
30 words
A terphenyl as claimed in claim 2 and wherein R 1 is H, alkyl or alkoxy provided that at least one of R 1 and R 2 is alkyl alkoxy.
Claim 5
Dependent Claim
18 words
A terphenyl as claimed in claim 3 and wherein X 1 is hydrogen and X 2 is fluorine.
Claim 6
Dependent Claim
36 words
A terphenyl 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.
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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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |