Patent US5037576A successfully refreshed from Google Patents.
US5037576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compounds, mixtures and devices
Assignee: Qinetiq Ltd
•
Filing: 1987-09-30
•
Granted: 1991-08-06
•
Expires: 2007-09-30
Abstract
Abstract Compounds for use in ferroelectric smectic liquid crystal mixtures of general formula (I), where R 1 is alkyl, Y is COO or OOC, m, n and p are 0 or 1 provided m+n is 2 or less and when Y is OOC, p is 0, X is a mesogenic group, especially 4 1 -alkyl- or alkyl-biphenyl or bicyclohexyl. Methods for preparation of these compounds are given, and ferroelectric smectic liquid crystal mixtures containing them are described.
Inventors
- 👤 George W. Gray
- 👤 David Lacey
- 👤 Kenneth J. Toyne
- 👤 Richard M. Scrowston
- 👤 Adam Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:27
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/2028; C09K19/30; C09K19/3001; C09K19/3003
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
71 words
A compound having a formula: ##STR74## where R 1 is methyl, Y is COO or OOC, m, n and p are independently 0 or 1, provided that (m+n+p) is no more than 2, and when Y is OOC then p is 0, and wherein x is selected from: ##STR75## where R is C 1-12 alkyl or alkoxy and (F) indicates that the phenyl ring indicated may carry a lateral fluorine substituent.
Claim 2
Dependent Claim
71 words
A compound having a formula: ##STR74## where R 1 is methyl, Y is COO or OOC, m, n and p are independently 0 or 1, provided that (m+n+p) is no more than 2, and when Y is OOC then p is 0, and wherein x is selected from: ##STR75## where R is C 1-12 alkyl or alkoxy and (F) indicates that the phenyl ring indicated may carry a lateral fluorine substituent.
Claim 3
Dependent Claim
16 words
A compound according to claim 1 having a formula: ##STR76## where p is 0 or 1.
Claim 4
Dependent Claim
21 words
A compound according to claim 2 having a formula: ##STR77## where R is C 3 to C 10 n-alkyl or n-alkoxy.
Claim 5
Dependent Claim
21 words
A compound according to claim 2 having a formula: ##STR78## where R is C 3 to C 10 n-alkyl or n-alkoxy.
Claim 6
Dependent Claim
21 words
A compound according to claim 2 having a formula: ##STR79## where R is C 3 to C 10 n-alkyl or n-alkoxy.
Claim 7
Dependent Claim
21 words
A compound according to claim 2 having a formula: ##STR80## where R is C 3 to C 10 n-alkyl or n-alkoxy.
Claim 8
Dependent Claim
10 words
A compound according to claim 1 having a formula: ##STR81##
Claim 9
Dependent Claim
21 words
A compound according to claim 7 having a formula: ##STR82## where R is C 3 to C 10 n-alkyl or n-alkoxy.
Claim 10
Dependent Claim
10 words
A compound according to claim 1 having a formula: ##STR83##
Claim 11
Dependent Claim
21 words
A compound according to claim 9 having a formula: ##STR84## where R is C 3 to C 10 n-alkyl or n-alkoxy.
Claim 12
Dependent Claim
21 words
A compound according to claim 1 having a formula: ##STR85## where R is C 3 to C 10 n-alkyl or n-alkoxy.
Claim 13
Dependent Claim
21 words
A compound according to claim 11 having a formula: ##STR86## where R is C 3 to C 10 n-alkyl or n-alkoxy.
Claim 14
Dependent Claim
86 words
A ferroelectric smectic liquid crystal material being a mixture of compounds, characterised in that at least one of the said compounds is a compound of formula I below: ##STR87## where R 1 is alkyl, Y is selected from --COO-- or --OOC--; m, n and p are independently 0 or 1, provided that (m+n+p) is no more than 2, and when Y is OOC then p is 0; and x is selected from ##STR88## the compound of formula I being in an optically active or racemic form.
Claim 15
Dependent Claim
86 words
A ferroelectric smectic liquid crystal material being a mixture of compounds, characterised in that at least one of the said compounds is a compound of formula I below: ##STR87## where R 1 is alkyl, Y is selected from --COO-- or --OOC--; m, n and p are independently 0 or 1, provided that (m+n+p) is no more than 2, and when Y is OOC then p is 0; and x is selected from ##STR88## the compound of formula I being in an optically active or racemic form.
Claim 16
Dependent Claim
36 words
A ferroelectric smectic liquid crystal material being a mixture of compounds, characterised in that at least one of the said compounds is a compound as claimed in claim 1 in an optically active or racemic form.
Claim 17
Dependent Claim
49 words
A material according to claim 14, characterised that in addition to the compound as claimed in any one of claims 1 to 12 it also contains at least one compound of formula: ##STR89## where R A and R B are independently C 1 to C 12 n-alkyl or n-alkoxy.
Claim 18
Dependent Claim
18 words
An electro-optical display device characterised in that it uses a liquid crystal material as claimed in claim 13.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |