US5013479A
Expired / Lapsed
US
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Optically active ether derivatives, preparation process therefor, liquid crystal materials and an optical switching element
Assignee: Hitachi Ltd
•
Filing: 1990-04-18
•
Granted: 1991-05-07
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Expires: 2010-04-18
Abstract
Abstract Disclosed are herein optically active ether derivatives represented by the formula (I): ##STR1## (wherein X represents --COO-- or --OCO--; A represents an alkyl or alkoxyl group having 3 to 15 carbon atoms; R represents an alkyl or alkyloxyalkyl group having 1 to 20 carbon atoms; l and m each represents a number of 1 to 2; and * indicates an asymmetric carbon atom), preparation processes therefor, liquid crystal materials containing such ether derivatives as active ingredient, and an optical switching element using said liquid crystal materials as liquid crystal element.
Inventors
- 👤 Masayoshi Minai
- 👤 Takayuki Higashii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:07
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
Optically active ether derivatives represented by the formula (I): ##STR52## wherein X represents --COO-- or --OCO--; A represents an alkyl or alkoxyl group having 6 to 15 carbon atoms; R represents an alkyl or alkoxyalkyl group having 1 to 20 carbon atoms; l and m each represents the number of 1 to 2 provided that the sum of l and m is 2 or 3; and * indicates an asymmetric carbon atom.
Claim 2
Dependent Claim
72 words
Optically active ether derivatives represented by the formula (I): ##STR52## wherein X represents --COO-- or --OCO--; A represents an alkyl or alkoxyl group having 6 to 15 carbon atoms; R represents an alkyl or alkoxyalkyl group having 1 to 20 carbon atoms; l and m each represents the number of 1 to 2 provided that the sum of l and m is 2 or 3; and * indicates an asymmetric carbon atom.
Claim 3
Dependent Claim
12 words
Optically active ether derivatives according to claim 1, wherein X is --COO--.
Claim 4
Dependent Claim
17 words
The optically active ether derivatives according to claim 2, where l is 2 and m is 1.
Claim 5
Dependent Claim
13 words
The optically active ether derivatives according to claim 1, wherein X is --OCO--.
Claim 6
Dependent Claim
16 words
The optically active ether derivatives according to claim 1, wherein R is an optically active group.
Claim 7
Dependent Claim
88 words
A liquid crystal composition having at least two components at least one of which is an optically active ether derivative represented by the formula (I): ##STR53## wherein X represents --COO-- or --OCO--; A represents an alkyl or alkoxyl group having 6 to 15 carbon atoms; R represents an alkyl or alkoxyalkyl group having 1 to 20 carbon atoms; l and m each represents the number of 1 to 2, provided that the sum of l and m is 2 or 3; and * indicates an asymmetric carbon atom.
Claim 8
Dependent Claim
88 words
A liquid crystal composition having at least two components at least one of which is an optically active ether derivative represented by the formula (I): ##STR53## wherein X represents --COO-- or --OCO--; A represents an alkyl or alkoxyl group having 6 to 15 carbon atoms; R represents an alkyl or alkoxyalkyl group having 1 to 20 carbon atoms; l and m each represents the number of 1 to 2, provided that the sum of l and m is 2 or 3; and * indicates an asymmetric carbon atom.
Claim 9
Dependent Claim
25 words
The liquid crystal composition according to claim 6, wherein R in the formula (I) representing the optically active ether derivative is an optically active group.
Claim 10
Dependent Claim
18 words
A light switching element employing a liquid crystal composition according to claim 6 as a liquid crystal material.
Claim 11
Dependent Claim
24 words
The light switching element according to claim 8, wherein R in the formula (I) representing optically active ether derivative is an optically active group.
References Cited (Backward Citations)
US4564694A
Cited
JPS59219251A
Cited
JPS60149547A
Cited
JPS60149548A
Cited
JPS6143A
Cited
US4834907A
Cited
JPS6122051A
Cited
US4556727A
Cited
EP0175591A2
Cited
JPS61165350A
Cited
JPS6246A
Cited
US4911861A
Cited
JPS61210056A
Cited
US4882085A
Cited
US4812259A
Cited
WO1987005018A2
Cited
WO1987005012A2
Cited
JPS62198647A
Cited
EP0255219A2
Cited
EP0270244A1
Cited
JPS63172788A
Cited
JPH0663633A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
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