US4472592A
Expired / Lapsed
US
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Nematic liquid crystalline compounds
Assignee: DIC Corp
•
Filing: 1983-06-27
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Granted: 1984-09-18
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Expires: 2003-06-27
Abstract
Abstract A nematic liquid crytalline compound selected from the group consisting of compounds represented by the general formula <IMAGE> compounds represented by the general formula <IMAGE> compounds represented by the general formula <IMAGE> and compounds represented by the general formula <IMAGE> wherein R and R', independently from each other, represent a linear alkyl group having 1 to 7 carbon atoms, and each cyclohexane ring is arranged in a trans(equatorial-equatorial) form. These compounds have higher nematic phaseisotropic liquid phase transition temperatures than conventional liquid crystalline compounds.
Inventors
- 👤 Haruyoshi Takatsu
- 👤 Hisato Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068; C07; C07C; C07C29/00; C07C29/132; C07C29/136; C07C29/143; C07C45/00; C07C45/45; C07C45/46; C07C49/00; C07C49/76; C07C49/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A nematic liquid crystalline compound selected from the group consisting of compounds represented by the general formula ##STR107## compounds represented by the general formula ##STR108## compounds represented by the general formula ##STR109## and compounds represented by the general formula ##STR110## wherein R and R', independently from each other, represent a linear alkyl group having 1 to 7 carbon atoms, and each cyclohexane ring is arranged in a trans(equatorial-equatorial) form.
Claim 2
Dependent Claim
69 words
A nematic liquid crystalline compound selected from the group consisting of compounds represented by the general formula ##STR107## compounds represented by the general formula ##STR108## compounds represented by the general formula ##STR109## and compounds represented by the general formula ##STR110## wherein R and R', independently from each other, represent a linear alkyl group having 1 to 7 carbon atoms, and each cyclohexane ring is arranged in a trans(equatorial-equatorial) form.
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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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |