US4261652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compounds and materials and devices containing them
Assignee: UK Secretary of State for Defence
•
Filing: 1979-08-01
•
Granted: 1981-04-14
•
Expires: 1999-08-01
Abstract
Abstract A novel liquid crystal compound has the molecular structure: ##STR1## where R is an alkyl group, which may contain up to 18 carbon atoms and which may be normal or branched and may contain a chiral center, ##STR2## is a bicyclo (2.2.2) octane ring, --X-- is and Y is a cyano group CN or R 1 or OR 1 where R 1 has the same definition as R. The compound may be used in mixtures with other liquid crystal compounds in the same or other families and the compound or mixtures may be used in known liquid crystal devices, eg the twisted nematic and cholesteric-to-nematic phase change devices, depending on its properties.
Inventors
- 👤 George W. Gray
- 👤 Stephen M. Kelly
- 👤 Damien G. McDonnell
- 👤 Alan Mosley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:37
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/32; C09K19/321
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
56 words
A liquid crystal compound having a molecular structure where R is an alkyl group; ##STR25## is a bicyclo-[2.2.2]-octane ring; X is a 1,4 phenylene group ##STR26## a 4,4' biphenylyl group ##STR27## or a 2,6 naphthyl group ##STR28## Y is a cyano group, an alkyl group or an alkoxy group; and n is 0, 1 or 2.
Claim 2
Dependent Claim
56 words
A liquid crystal compound having a molecular structure where R is an alkyl group; ##STR25## is a bicyclo-[2.2.2]-octane ring; X is a 1,4 phenylene group ##STR26## a 4,4' biphenylyl group ##STR27## or a 2,6 naphthyl group ##STR28## Y is a cyano group, an alkyl group or an alkoxy group; and n is 0, 1 or 2.
Claim 3
Dependent Claim
30 words
A liquid crystal compound as claimed in claim 1 and wherein n is 0, Y is CN and R is an n-alkyl group having from one to ten carbon atoms.
Claim 4
Dependent Claim
35 words
A liquid crystal compound as claimed in claim 1 and wherein n is 0, Y is CN and R is an alkyl group having from three to ten carbon atoms and containing a chiral centre.
Claim 5
Dependent Claim
30 words
A liquid crystal compound as claimed in claim 1 and wherein n is 1, Y is CN and R is an n-alkyl group having from one to ten carbon atoms.
Claim 6
Dependent Claim
35 words
A liquid crystal compound as claimed in claim 1 and wherein n is 1, Y is CN and R is an alkyl group having from three to ten carbon atoms and containing a chiral centre.
Claim 7
Dependent Claim
30 words
A liquid crystal compound as claimed in claim 1 and wherein n is 2, Y is CN and R is an n-alkyl group having from one to ten carbon atoms.
Claim 8
Dependent Claim
35 words
A liquid crystal compound as claimed in claim 1 and wherein n is 2, Y is CN and R is an alkyl group having from three to ten carbon atoms and containing a chiral centre.
Claim 9
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR29##
Claim 10
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR30##
Claim 11
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR31##
Claim 12
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR32##
Claim 13
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR33##
Claim 14
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR34##
Claim 15
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR35##
Claim 16
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR36##
Claim 17
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR37##
Claim 18
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR38##
Claim 19
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR39##
Claim 20
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR40##
Claim 21
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR41##
Claim 22
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR42##
Claim 23
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR43##
Claim 24
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR44##
Claim 25
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR45##
Claim 26
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR46##
Claim 27
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR47##
Claim 28
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR48##
Claim 29
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR49##
Claim 30
Dependent Claim
15 words
A liquid crystal compound as claimed in claim 1 and wherein the compound is ##STR50##
Claim 31
Dependent Claim
22 words
A liquid crystal material comprising a mixture of compounds at least one of which is a compound as claimed in claim 1.
Claim 32
Dependent Claim
22 words
A liquid crystal material comprising a mixture of compounds wherein the mixture includes at least two compounds as claimed in claim 1.
Claim 33
Dependent Claim
35 words
A liquid crystal material as claimed in claim 30 and wherein the mixture includes also at least one compound of the form ##STR51## where R' 1 is an alkyl or alkoxy group, n'=0 or 1.
Claim 34
Dependent Claim
64 words
A liquid crystal electro-optic device comprising two adjacent dielectric substrates at least one of which is optically transparent, a layer of liquid crystal material between the substrates and electrodes on the inner surfaces of the substrates to allow an electric field to be applied across the material, characterised in that the liquid crystal material comprises at least one compound as claimed in claim 1.
Claim 35
Dependent Claim
17 words
A device as claimed in claim 33 and wherein the device is a twisted nematic effect device.
Claim 36
Dependent Claim
18 words
A device as claimed in claim 33 and wherein the device is a cholesteric-to-nematic phase change effect device.
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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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |