US4222888A
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US
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Liquid crystal materials containing a diphenylethane nucleus
Assignee: Thales SA
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Filing: 1979-05-03
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Granted: 1980-09-16
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Expires: 1999-05-03
Abstract
Abstract Novel mesomorphic substances, constituting, in certain temperature ranges, nematic or smectic liquid crystals which are compounds of the formula: ##STR1## wherein R 1 is an alkoxy group containing 1 to 10 atoms of carbon; R 2 is an alkyl group containing 1 to 10 atoms of carbon; X is Br or CN.
Inventors
- 👤 Jean-Claude Dubois
- 👤 Tinh H. Nguyen
- 👤 Annie Zann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:32
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2014
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
Liquid crystal materials of the formula: ##STR21## wherein R 1 represents an alkoxy group having n carbon atoms (n being an integer from 1 to 10), R 2 represents an alkyl group having m carbon atoms (m being an integer from 1 to 10) and X represents bromine or the cyanide group.
Claim 2
Dependent Claim
52 words
Liquid crystal materials of the formula: ##STR21## wherein R 1 represents an alkoxy group having n carbon atoms (n being an integer from 1 to 10), R 2 represents an alkyl group having m carbon atoms (m being an integer from 1 to 10) and X represents bromine or the cyanide group.
Claim 3
Dependent Claim
22 words
Liquid crystal materials according to claim 1, wherein: R 1 =C 8 H 17 O R 2 =C 5 H 11 X=Br.
Claim 4
Dependent Claim
22 words
Liquid crystal materials according to claim 1, wherein: R 1 =C 8 H 17 O R 2 =C 5 H 11 X=CN.
Claim 5
Dependent Claim
20 words
A liquid crystal mixture which comprises a material of the formula of claim 1 and the para-methoxybenzoate of parapentyl phenol.
Claim 6
Dependent Claim
19 words
A liquid crystal mixture according to claim 4 wherein said material represents 10 percent in moles of said mixture.
References Cited (Backward Citations)
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Cited
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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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |