Patent US4752413A successfully refreshed from Google Patents.
US4752413A
Expired / Lapsed
US
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2-(alkyloxycarbonyloxyphenyl)-5-alkylpyridine and composition containing same
Assignee: JNC Corp
•
Filing: 1987-05-26
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Granted: 1988-06-21
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Expires: 2007-05-26
Abstract
Abstract A novel liquid crystal compound exhibiting smectic phases and useful for display elements and a chiral smectic liquid crystal composition containing the compound are provided, which compound is expressed by the formula ##STR1## wherein R 1 and R 2 each represent an alkyl group of 1 to 20 carbon atoms and X represents H atom or F atom, and which composition comprises at least one kind of the compounds of the formula (I) and an optically active compound.
Inventors
- 👤 Hiromichi Inoue
- 👤 Takashi Inukai
- 👤 Kouji Ohno
- 👤 Shinichi Saito
- 👤 Kazutoshi Miyazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:01
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/28; C07D213/30; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/3444
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
34 words
A liquid crystal compound expressed by the formula ##STR10## wherein R 1 and R 2 each represent an alkyl group of 1 to 20 carbon atoms and X represents hydrogen atom or fluorine atom.
Claim 2
Dependent Claim
34 words
A liquid crystal compound expressed by the formula ##STR10## wherein R 1 and R 2 each represent an alkyl group of 1 to 20 carbon atoms and X represents hydrogen atom or fluorine atom.
Claim 3
Dependent Claim
34 words
A liquid crystal compound according to claim 1 wherein R 1 represents an alkyl group of 6-12 carbon atoms and R 2 represents an alkyl group of 1-12 carbon atoms in said formula (I).
Claim 4
Dependent Claim
28 words
A chiral smectic liquid crystal composition comprising at least one kind of the liquid crystal compounds of said formula (I) of claim 1 and an optically active compound.
Claim 5
Dependent Claim
23 words
A chiral smectic liquid crystal composition according to claim 3 wherein the chiral smectic phase of the composition is chiral smectic C phase.
Claim 6
Dependent Claim
22 words
A chiral smectic liquid crystal composition according to claim 3 wherein said optically active compound is an optically active liquid crystal compound.
Claim 7
Dependent Claim
22 words
A chiral smectic liquid crystal composition according to claim 5 wherein said optically active compound is a chiral smectic liquid crystal compound.
Claim 8
Dependent Claim
15 words
A ferroelectric light switching element containing a chiral smectic liquid crystal composition of claim 3.
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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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |