US4556745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compounds
Assignee: Qinetiq Ltd
•
Filing: 1984-03-26
•
Granted: 1985-12-03
•
Expires: 2004-03-26
Abstract
Abstract A liquid crystal composition includes at least one compound of Formula (I) as follows: A--CH.sub.2.CH.sub.2 --B Formula (I) where A and B are substituted ring structures which include terminal alkyl groups, A being selected from: ##STR1## where R' 1 is an alkyl group R 1 , an alkoxy group R 1 O, an alkylcarbonyloxy group R 1 CO.O or an alkoxycarbonyloxy group R 1 OCO.O; ##STR2## where R 1 is an alkyl group; or ##STR3## where R 1 is an alkyl group; and B being selected from: ##STR4## where R' 2 is an alkyl group R 2 , an alkoxy group OR 2 , an alkylcarbonyloxy group OCO.R 2 or an alkoxycarbonyloxy group OCO.OR' 2 ; and X is hydrogen or a cyano group or a methyl group or a halogen; ##STR5## where R 2 is an alkyl group; or ##STR6## where R 2 is an alkyl group; ##STR7## being a trans-1,4-disubstituted cyclohexane ring and ##STR8## a 1,4-disubstituted bicyclo(2,2,2)octane ring.
Inventors
- 👤 Neil Carr
- 👤 George W. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:55
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A compound suitable for use in liquid crystal material and having the formula: A--CH.sub.2.CH.sub.2 --B Formula (I) where A and B are substituted ring structures, A being: ##STR79## where R 1 is an alkyl group; and B being selected from: ##STR80## where R' 2 is an alkyl group R 2 , an alkoxy group OR 2 , an alkylcarbonyloxy group OCO.R 2 or an alkoxycarbonyloxy group OCO.OR 2 ; and X is hydrogen or a cyano group or a methyl group or a halogen; ##STR81## where R 2 is an alkyl group; or ##STR82## where R 2 is an alkyl group; ##STR83## being a 1,4-disubstituted bicyclo(2,2,2)octane ring.
Claim 2
Dependent Claim
107 words
A compound suitable for use in liquid crystal material and having the formula: A--CH.sub.2.CH.sub.2 --B Formula (I) where A and B are substituted ring structures, A being: ##STR79## where R 1 is an alkyl group; and B being selected from: ##STR80## where R' 2 is an alkyl group R 2 , an alkoxy group OR 2 , an alkylcarbonyloxy group OCO.R 2 or an alkoxycarbonyloxy group OCO.OR 2 ; and X is hydrogen or a cyano group or a methyl group or a halogen; ##STR81## where R 2 is an alkyl group; or ##STR82## where R 2 is an alkyl group; ##STR83## being a 1,4-disubstituted bicyclo(2,2,2)octane ring.
Claim 3
Dependent Claim
23 words
A compound as claimed in claim 1 and wherein the alkyl groups R 1 and R 2 have up to 18 carbon atoms.
Claim 4
Dependent Claim
23 words
A compound as claimed in claim 1 and wherein the alkyl groups R 1 and R 2 have ten or less carbon atoms.
Claim 5
Dependent Claim
20 words
A compound as claimed in claim 3 and wherein the alkyl groups R 1 and R 2 are n-alkyl groups.
Claim 6
Dependent Claim
33 words
A compound as claimed in claim 1 and which has the formula: ##STR84## wherein each R is, independently, n-alkyl having 1 to 10 carbon atoms and X is selected from H and F.
Claim 7
Dependent Claim
34 words
A compound as claimed in claim 1 and which has the formula: ##STR85## where each R is, independently, n-alkyl having from 1 to 10 carbon atoms and X is selected from H and F.
Claim 8
Dependent Claim
13 words
A compound as claimed in claim 5 and which has the formula: ##STR86##
Claim 9
Dependent Claim
13 words
A compound as claimed in claim 5 and which has the formula: ##STR87##
Claim 10
Dependent Claim
13 words
A compound as claimed in claim 5 and which has the formula: ##STR88##
Claim 11
Dependent Claim
13 words
A compound as claimed in claim 5 and which has the formula: ##STR89##
Claim 12
Dependent Claim
13 words
A compound as claimed in claim 6 and which has the formula: ##STR90##
Claim 13
Dependent Claim
13 words
A compound as claimed in claim 6 and which has the formula: ##STR91##
Claim 14
Dependent Claim
13 words
A compound as claimed in claim 6 and which has the formula: ##STR92##
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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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |