Patent US4820878A successfully refreshed from Google Patents.
US4820878A
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Tolan-type nematic liquid crystalline compounds
Assignee: DIC Corp
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Filing: 1987-02-11
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Granted: 1989-04-11
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Expires: 2007-02-11
Abstract
Abstract A liquid crystalline compound of the general formula <IMAGE> (I) <IMAGE> <IMAGE> +TR <IMAGE> R and R', independently from each other, represent a linear alkyl group havng 1 to 10 carbon atoms, an alkoxymethylene group whose alkoxy moiety has 1 t 10 carbon atoms, a cyano group or a halogen atom, and n and m, independently from each other, represent 0 to 1.
Inventors
- 👤 Haruyoshi Takatsu
- 👤 Makoto Sasaki
- 👤 Yasuyuki Tanaka
- 👤 Hisato Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:44
CPC Classifications
C; C07; C07C; C07C255/00; C07C13/00; C07C13/28; C07C15/00; C07C15/40; C07C15/50; C07C15/54; C07C25/00; C07C25/24; C07C43/00; C07C43/02; C07C43/03; C07C43/14; C07C43/164; C07C43/166; C07C43/168; C07C45/00; C07C45/45; C07C45/46; C07D; C07D319/00; C07D319/04; C07D319/06; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/14; C09K19/18; C09K19/30; C09K19/3001; C09K19/3059; C09K19/34; C09K19/3402; C09K2019/3422
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A compound of the general formula ##STR143## wherein R and R', independently from each other, represent a linear alkyl group having 1 to 10 carbon atoms, and the cyclohexane ring has a trans(equatorial-equatorial) configuration.
Claim 2
Dependent Claim
34 words
A compound of the general formula ##STR143## wherein R and R', independently from each other, represent a linear alkyl group having 1 to 10 carbon atoms, and the cyclohexane ring has a trans(equatorial-equatorial) configuration.
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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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |