US5207946A
Expired / Lapsed
US
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Liquid crystal compounds
Assignee: Showa Shell Sekiyu KK
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Filing: 1990-07-25
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Granted: 1993-05-04
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Expires: 2010-07-25
Abstract
Abstract A liquid crystal compound represented by formula (I): ##STR1## wherein R 1 represents an alkyl group having from 3 to 18 carbon atoms; R 2 represents an alkyl group having from 3 to 18 carbon atoms; X represents ##STR2## (A) and (B) each represents a group selected from the group consisting of ##STR3## and * indicates an optically active center.
Inventors
- 👤 Koichi Numazawa
- 👤 Noriko Yamakawa
- 👤 Yoshiichi Suzuki
- 👤 Ichiro Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:56
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/02; C09K19/0266; C07; C07C; C07C69/00; C07C69/017; C07C69/76; C07C69/84; C07C69/90; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
A liquid crystal compound represented by formula (III) ##STR22## wherein R 1 and R 2 represents an alkyl group having from 4 to 15 carbon atoms, (A) and (B) each represents a group selected from the group of ##STR23## and which compound is in an S * .sub.(3) phase.
Claim 2
Dependent Claim
49 words
A liquid crystal compound represented by formula (III) ##STR22## wherein R 1 and R 2 represents an alkyl group having from 4 to 15 carbon atoms, (A) and (B) each represents a group selected from the group of ##STR23## and which compound is in an S * .sub.(3) phase.
Claim 3
Dependent Claim
25 words
A liquid crystal compound as claimed in claim 1, wherein R 1 is a straight chain alkyl group having from 6 to 12 carbon atoms.
Claim 4
Dependent Claim
25 words
A liquid crystal compound as claimed in claim 1, wherein R 2 is a straight chain alkyl group having from 5 to 12 carbon atoms.
References Cited (Backward Citations)
WO1987007890A2
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US4917817A
Cited
US4918213A
Cited
US4921632A
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US4973738A
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JPH0240346A
Cited
JPH0245450A
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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) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |