US4814523A
Expired / Lapsed
US
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Nematic liquid crystal compound of four ring systems
Assignee: DIC Corp
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Filing: 1988-05-18
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Granted: 1989-03-21
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Expires: 2008-05-18
Abstract
Abstract A tetracyclic nematic liquid crystal compound of the following formula: ##STR1## wherein R represents a straight-chained alkyl group carrying one to seven carbon atoms; and ##STR2## has a trans (equatorial-equatorial) configuration; is disclosed. This compound has a high N-I transition temperature and a low S-N transition temperature and is highly useful as an electro-optical display material.
Inventors
- 👤 Yasuyuki Tanaka
- 👤 Haruyoshi Takatsu
- 👤 Kiyohumi Takeuchi
- 👤 Yuji Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:20
CPC Classifications
C; C07; C07C; C07C25/00; C07C25/18; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
27 words
A compound of the general formula: ##STR19## wherein R represents a straight-chained alkyl group carrying one to seven carbon atoms; and ##STR20## has a trans (equatorial-equatorial configuration.
Claim 2
Dependent Claim
27 words
A compound of the general formula: ##STR19## wherein R represents a straight-chained alkyl group carrying one to seven carbon atoms; and ##STR20## has a trans (equatorial-equatorial configuration.
Claim 3
Dependent Claim
10 words
The compound of claim 1 represented by the formula: ##STR21##
Claim 4
Dependent Claim
10 words
The compound of claim 1 represented by the formula ##STR22##
References Cited (Backward Citations)
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US4415470A
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US4545922A
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US4439340A
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US4477369A
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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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |