US4110243A
Expired / Lapsed
US
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Alkylphenyl 3-cyano or fluoro-4-alkyloxybenzoates and mesomorphic mixtures thereof
Assignee: Thales SA
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Filing: 1976-04-27
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Granted: 1978-08-29
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Expires: 1996-04-27
Abstract
Abstract An organic compound having a high negative dielectric anisotropy is capable, by mixing with a nematic liquid crystal, of improving the dynamic scattering effect of the liquid crystal. The organic compounds have the formula: ##STR1## in which R is either a fluoro or a nitrile radical and wherein R 1 and R 2 are alkyl radicals. An excellent dynamic scattering effect is obtained by mixing the new organic compound even in a low proportion with a nematic liquid crystal.
Inventors
- 👤 Marie A. Abert-Mellah
- 👤 Jean Claude Dubois
- 👤 Annie Zann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:11
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
40 words
A compound of the formula: ##STR13## in which R is a fluoro or a nitrile radical, and wherein R 1 and R 2 are alkyl radicals (C n H 2n+1 ) with n being an integer of 1 to 9.
Claim 2
Dependent Claim
40 words
A compound of the formula: ##STR13## in which R is a fluoro or a nitrile radical, and wherein R 1 and R 2 are alkyl radicals (C n H 2n+1 ) with n being an integer of 1 to 9.
Claim 3
Dependent Claim
85 words
A mesomorphic mixture comprising (a) an organic compound of the formula: ##STR14## wherein R is a fluoro or a nitrile radical, and wherein R 1 and R 2 are alkyl radicals (C n H 2n+1 ) with n being an integer of 1 to 9; and (b) a liquid nematic crystal; wherein said organic compound (a) is present in an amount effective for improving the scattering effect of said liquid nematic crystal in said mesomorphic mixture; and wherein said liquid nematic crystal is 4'-pentylphenyl 4-methoxybenzoate.
Claim 4
Dependent Claim
85 words
A mesomorphic mixture comprising (a) an organic compound of the formula: ##STR14## wherein R is a fluoro or a nitrile radical, and wherein R 1 and R 2 are alkyl radicals (C n H 2n+1 ) with n being an integer of 1 to 9; and (b) a liquid nematic crystal; wherein said organic compound (a) is present in an amount effective for improving the scattering effect of said liquid nematic crystal in said mesomorphic mixture; and wherein said liquid nematic crystal is 4'-pentylphenyl 4-methoxybenzoate.
Claim 5
Dependent Claim
30 words
The mixture as claimed in claim 2, wherein R 2 = c 5 h 11 r 1 = ch 3 or C 4 H 9 or C 8 H 17
Claim 6
Dependent Claim
30 words
The mixture as claimed in claim 2, wherein R 2 = c 7 h 15 r 1 = ch 3 or C 4 H 9 or C 8 H 17
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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |