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US4212762A
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Liquid crystal materials having a formula containing a diphenylethane nucleus
Assignee: Thales SA
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Filing: 1978-11-21
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Granted: 1980-07-15
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Expires: 1998-11-21
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 alkyl or alkoxy group containing 1 to 10 atoms of carbon; R 2 is Br, CN or an alkyl (or an alkoxy) group containing 1 to 10 atoms of carbon.
Inventors
- 👤 Jean-Claude Dubois
- 👤 Huu Tinh Nguyen
- 👤 Annie Zann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:12
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: 8
Claim 1
Independent Claim
58 words
Liquid crystal materials comprising at least one compound of the formula: ##STR20## wherein R 1 represents an alkyl or alkoxy group having n carbon atoms (n being an integer from 1 to 10), and R 2 represents an alkyl group having m carbon atoms (m being an integer from 1 to 10), or bromine or the cyanine group.
Claim 2
Dependent Claim
58 words
Liquid crystal materials comprising at least one compound of the formula: ##STR20## wherein R 1 represents an alkyl or alkoxy group having n carbon atoms (n being an integer from 1 to 10), and R 2 represents an alkyl group having m carbon atoms (m being an integer from 1 to 10), or bromine or the cyanine group.
Claim 3
Dependent Claim
42 words
Liquid crystal materials according to claim 1, wherein: R 1 =C 3 H 7 , C 5 H 11 , C 6 H 13 , C 7 H 15 or C 8 H 17 ; R 2 =C 5 H 11 .
Claim 4
Dependent Claim
36 words
Liquid crystal materials according to claim 1, wherein: R 1 =CH 3 O, C 4 H 9 O, C 7 H 15 O or C 8 H 17 O; R 2 =C 5 H 11 .
Claim 5
Dependent Claim
40 words
Liquid crystal materials according to claim 1, wherein: R 1 =C 3 H 7 , C 5 H 11 , C 6 H 13 , C 7 H 15 or C 8 H 17 ; R 2 =Br or CN.
Claim 6
Dependent Claim
39 words
Liquid crystal materials according to claim 1, wherein: R 1 =CH 3 O, C 2 H 5 O, C 4 H 9 O, C 7 H 15 O or C 8 H 17 O; R 2 =Br or CN.
Claim 7
Dependent Claim
20 words
Liquid crystal materials comprising at least one liquid crystal material according to claim 1, mixed with para-methoxybenzoate of parapentyl phenol.
Claim 8
Dependent Claim
20 words
Liquid crystal materials according to claim 6, wherein said materials represents 5 to 15 percent in moles of said mixture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |