Patent US4424371A successfully refreshed from Google Patents.
US4424371A
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3-Chloro-4-cyanophenyl 4'-substituted benzoates
Assignee: MERECK PATENT FRANKFURTER STRASSE 250 6100 DARMSTADT A Co OF GERMANY GmbH
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Filing: 1982-09-23
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Granted: 1984-01-03
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Expires: 2002-09-23
Abstract
Abstract Disclosed are compounds of the formula: ##STR1## wherein R is an alkyl group having 1 to 8 carbon atoms and X is a dioxane, cyclohexane, or benzene ring. The compounds of the invention are suitable as liquid crystal materials in electrooptical displays. Specifically, when added to nematic liquid crystals, these compounds provide an increase in the positive dielectric anisotropy of the liquid crystal composition.
Inventors
- 👤 Ying-Yen Hsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:54
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068; C09K19/10; C09K19/20; C09K19/2007; C09K19/34; C09K19/3402; C09K2019/3422
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
A compound of the formula: ##STR24## wherein R is an alkyl group having 1 to 8 carbon atoms.
Claim 2
Dependent Claim
18 words
A compound of the formula: ##STR24## wherein R is an alkyl group having 1 to 8 carbon atoms.
Claim 3
Dependent Claim
24 words
A nematic liquid crystal compound for electrooptic displays having the formula: ##STR25## wherein R is an alkyl group having 1 to 7 carbon atoms.
Claim 4
Dependent Claim
24 words
A nematic liquid crystal compound for electrooptic displays having the formula: ##STR25## wherein R is an alkyl group having 1 to 7 carbon atoms.
Claim 5
Dependent Claim
37 words
The compound of claim 1 or 2 wherein R is selected from the group consisting of C 2 H 5 , C 3 H 7 , C 4 H 9 , and C 7 H 15 .
Claim 6
Dependent Claim
15 words
The compound of claims 1 or 2 wherein R is C 5 H 11 .
Claim 7
Dependent Claim
26 words
The compound of claim 1 or 2 wherein R is selected from the group consisting of C 5 H 13 and C 8 H 17 .
References Cited (Backward Citations)
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Cited
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US4229315A
Cited
US4348324A
Cited
US4200580A
Cited
US4344856A
Cited
US4313878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |