US4490277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mesomorphic material with low optical anisotropy and process for producing same
Assignee: Individual
•
Filing: 1981-05-29
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Granted: 1984-12-25
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Expires: 2001-05-29
Abstract
Abstract A mesomorphic material contains at least one compound "A" ensuring a positive dielectric anisotropy of the material and a compound "B" ensuring a lowered value of optical anisotropy of the material; the content of compound A is within the range of from 4.9 to 30.0% by weight, the content of compound B is within the range of from 70 to 95.1% by weight. The material of the invention has a dielectric anisotropy of from +1 to +10 and the value of optical anisotropy--within the range of from 0.04 to 0.1.
Inventors
- 👤 Mikhail F. Grebenkin
- 👤 Alexandr V. Ivashenko
- 👤 Ljudmila A. Karamysheva
- 👤 Lev M. Blinov
- 👤 Evgeny I. Kovshev
- 👤 Nikolai M. Shtykov
- 👤 Viktor V. Titov
- 👤 Vadim M. Shoshin
- 👤 Irina F. Agafonova
- 👤 Mikhail I. Barnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:10
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/44; C09K19/06; C09K19/32; C09K19/322; C09K19/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A mesomorphic material with a low value of optical anisotropy which comprises at least one aromatic nitrile selected from the class of aromatic nitriles represented by compounds of the general formula R(O).sub.m --X--CN where m=0 or 1, R is alkyl with 4 to 7 carbon atoms, and X is ##STR5## said aromatic nitrile being present in an amount ranging from 4.9 to 19.3% by weight, and a mixture of 4-n-butyltranscyclohexane carboxylic acid and 4-n-hexyltranscyclohexane carboxylic acid, said mixture being present in an amount ranging from 80.7% to 95.1% by weight and the molar ratio between said carboxylic acids in said mixture being 1:1.
Claim 2
Dependent Claim
103 words
A mesomorphic material with a low value of optical anisotropy which comprises at least one aromatic nitrile selected from the class of aromatic nitriles represented by compounds of the general formula R(O).sub.m --X--CN where m=0 or 1, R is alkyl with 4 to 7 carbon atoms, and X is ##STR5## said aromatic nitrile being present in an amount ranging from 4.9 to 19.3% by weight, and a mixture of 4-n-butyltranscyclohexane carboxylic acid and 4-n-hexyltranscyclohexane carboxylic acid, said mixture being present in an amount ranging from 80.7% to 95.1% by weight and the molar ratio between said carboxylic acids in said mixture being 1:1.
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |