Patent US4880560A successfully refreshed from Google Patents.
US4880560A
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Lactic acid derivative, liquid crystal composition containing same and liquid crystal device
Assignee: Canon Inc
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Filing: 1989-01-03
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Granted: 1989-11-14
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Expires: 2009-01-03
Abstract
Abstract An optically active lactic acid derivative represented by the following formula (Ia) or (Ib): ##STR1## wherein R is a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 1-16 carbon atoms, R 1 is an alkyl group having 4-16 carbon atoms, m and n are respectively 1 or 2, k is 0 or 1, and C* is an asymmetric carbon atom. A liquid crystal composition containing the lactic acid derivative and a liquid crystal device using the liquid crystal composition are also disclosed.
Inventors
- 👤 Kazuo Yoshinaga
- 👤 Kazuharu Katagiri
- 👤 Kenji Shinjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:42
CPC Classifications
C; C07; C07C; C07C65/00; C07C65/21; C07C65/24; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/062; C09K19/08; C09K19/10; C09K19/12; C09K19/126; C09K2019/0425; C09K2019/0437; C09K2019/121; C09K2019/122
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
35 words
An optically active lactic acid derivative represented by the formula (Ia): ##STR15## wherein R is a linear alkyl group having 1-16 carbon atoms, n is 1 or 2, and C* is an asymmetric carbon atom.
Claim 2
Dependent Claim
35 words
An optically active lactic acid derivative represented by the formula (Ia): ##STR15## wherein R is a linear alkyl group having 1-16 carbon atoms, n is 1 or 2, and C* is an asymmetric carbon atom.
Claim 3
Dependent Claim
20 words
A lactic acid derivative according to claim 1, wherein said R is a linear alkyl group having 2-14 carbon atoms.
Claim 4
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR16##
Claim 5
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR17##
Claim 6
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR18##
Claim 7
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR19##
Claim 8
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR20##
Claim 9
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR21##
Claim 10
Dependent Claim
44 words
A liquid crystal composition containing at least one species of optically active lactic acid derivative represented by the formula (Ia): ##STR22## wherein R is a linear alkyl group having 1-16 carbon atoms, n is 1 or 2, and C* is an asymmetric carbon atom.
Claim 11
Dependent Claim
44 words
A liquid crystal composition containing at least one species of optically active lactic acid derivative represented by the formula (Ia): ##STR22## wherein R is a linear alkyl group having 1-16 carbon atoms, n is 1 or 2, and C* is an asymmetric carbon atom.
Claim 12
Dependent Claim
27 words
A liquid crystal composition according to claim 9, which comprises a mixture of a lactic acid derivative represented by the formula (Ia) and a nematic liquid crystal.
Claim 13
Dependent Claim
21 words
A liquid crystal composition according to claim 10, which contains the lactic acid derivative in a proportion of 0.1-80 wt. %.
Claim 14
Dependent Claim
26 words
A liquid crystal composition according to claim 10, which contains the lactic acid derivative in a proportion of 0.1-50 wt. % and shows a nematic phase.
Claim 15
Dependent Claim
33 words
A liquid crystal composition according to claim 9, which comprises a mixture of a lactic acid derivative represented by the formula (Ia) and a smectic liquid crystal, and shows a chiral smectic phase.
Claim 16
Dependent Claim
21 words
A liquid crystal composition according to claim 13, which contains the lactic acid derivative in a proportion of 0.1-80 wt. %.
Claim 17
Dependent Claim
20 words
A liquid crystal composition according to claim 13, wherein said smectic liquid crystal is a compound having an ester unit.
Claim 18
Dependent Claim
20 words
A liquid crystal composition according to claim 13, wherein said smectic liquid crystal is a compound having a biphenylcarboxylate unit.
Claim 19
Dependent Claim
20 words
A liquid crystal composition according to claim 13, wherein said smectic liquid crystal is a compound having an azoxybenzene unit.
Claim 20
Dependent Claim
20 words
A liquid crystal composition according to claim 13, wherein said smectic liquid crystal is a compound having a pyrimidine ring.
Claim 21
Dependent Claim
20 words
A liquid crystal composition according to claim 13, wherein said smectic liquid crystal is a compound having a phenylbenzoate unit.
Claim 22
Dependent Claim
34 words
A liquid crystal composition according to claim 9, which comprises a mixture of a lactic acid derivative represented by the formula (Ia) and a chiral smectic liquid crystal, and shows a chiral smectic phase.
Claim 23
Dependent Claim
21 words
A liquid crystal composition according to claim 20, which contains the lactic acid derivative in a proportion of 0.1-80 wt. %.
References Cited (Backward Citations)
US4065489A
Cited
US4158011A
Cited
US4564694A
Cited
US4613209A
Cited
US4556727A
Cited
US4775223A
Cited
US4705874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |