US4900472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2,5-diphenyl pyrimidine compounds and liquid crystal compositions
Assignee: JNC Corp
•
Filing: 1988-10-20
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Granted: 1990-02-13
•
Expires: 2008-10-20
Abstract
Abstract The present invention provides optically active compounds represented by the following general formula: ##STR1## liquid crystal compositions containing the compounds, and electro optical elements using the above compositions. The compounds of the present invention are optically active compounds having characteristics suited for a ferroelectric liquid crystal composition, especially having enough spontaneous polarization to realize quick response.
Inventors
- 👤 Kazutoshi Miyazawa
- 👤 Makoto Ushioda
- 👤 Hiromichi Inoue
- 👤 Shinichi Saito
- 👤 Kouji Ohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:04
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/32; C07D239/34; C07D239/26; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3463
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
An optically active compound represented by the formula: ##STR35## wherein R 1 is alkyl or alkoxy having 4-12 carbon atoms, R 2 is alkyl, acyl or alkoxyacyl having 4-8 carbon atoms, ##STR36## and * indicates an asymmetric carbon atom.
Claim 2
Dependent Claim
39 words
An optically active compound represented by the formula: ##STR35## wherein R 1 is alkyl or alkoxy having 4-12 carbon atoms, R 2 is alkyl, acyl or alkoxyacyl having 4-8 carbon atoms, ##STR36## and * indicates an asymmetric carbon atom.
Claim 3
Dependent Claim
18 words
An optically active compound as claimed in claim 1, wherein R 1 is alkyl having 4-12 carbon atoms.
Claim 4
Dependent Claim
18 words
An optically active compound as claimed in claim 1, wherein R 2 is alkyl having 4-8 carbon atoms.
Claim 5
Dependent Claim
18 words
An optically active compound as claimed in claim 1, wherein R 2 is acyl having 4-8 carbon atoms.
Claim 6
Dependent Claim
18 words
An optically active compound as claimed in claim 1, wherein R 2 is alkoxyacyl having 4-8 carbon atoms.
Claim 7
Dependent Claim
14 words
An optically active compound as claimed in claim 2, wherein R 2 is hexyl.
Claim 8
Dependent Claim
19 words
An optically active compound as claimed in claim 2, wherein R 2 is --COC 4 H 9 or ##STR37##
Claim 9
Dependent Claim
14 words
An optically active compound as claimed in claim 2, wherein R 2 is ##STR38##
Claim 10
Dependent Claim
25 words
A liquid crystal composition comprising at least two components, at least one of which is an optically active compound as set forth in claim 2.
Claim 11
Dependent Claim
14 words
A liquid crystal composition as claimed in claim 9, exhibiting a chiral smectic phase.
Claim 12
Dependent Claim
14 words
A liquid crystal composition as claimed in claim 9, exhibiting a chiral nematic phase.
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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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |