US4405211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compositions with pleochroic anthraquinone dyes
Assignee: UK Secretary of State for Defence
•
Filing: 1981-07-27
•
Granted: 1983-09-20
•
Expires: 2001-07-27
Abstract
Abstract A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a formula: ##STR1## wherein: R represents a group selected from optionally substituted alkyl and optionally substituted monocyclic aryl; Q represents a group selected from halo, OH, --NO 2 , alkyl, aryl and --NR 1 R 2 , wherein each of R 1 and R 2 independently represents a group selected from H, alkyl and aryl; x represents an integer from 1 to 4; and y represents an integer from 0 to 4; x+y being in the inclusive range 2 to 4; provided that when x+y=2, x=1 and y=1.
Inventors
- 👤 Kenneth J. Harrison
- 👤 Edward P. Raynes
- 👤 Frances C. Saunders
- 👤 David J. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:26
CPC Classifications
C; C09; C09K; C09K19/00; C09B; C09B1/00; C09B1/56; C09B1/58; C09K19/04; C09K19/06; C09K19/52; C09K19/60; C09K19/603
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
96 words
A material suitable for a guest-host liquid crystal device comprising a solution of a liquid crystal material and a pleochroic dye, wherein the pleochroic dye comprises at least one compound having a formula: wherein: R represents a group selected from alkyl and aryl; each of A, B and C independently represents a group selected from H, --SR and --NR 2 R 2 groups, wherein R 1 and R 2 are independently selected from H, alkyl and aryl; provided that at least one of A, B and C is other than H and that if two of
Claim 2
Dependent Claim
96 words
A material suitable for a guest-host liquid crystal device comprising a solution of a liquid crystal material and a pleochroic dye, wherein the pleochroic dye comprises at least one compound having a formula: wherein: R represents a group selected from alkyl and aryl; each of A, B and C independently represents a group selected from H, --SR and --NR 2 R 2 groups, wherein R 1 and R 2 are independently selected from H, alkyl and aryl; provided that at least one of A, B and C is other than H and that if two of
Claim 3
Dependent Claim
14 words
A material as claimed in claim 1 in which the group R represents a
Claim 4
Dependent Claim
14 words
A material as claimed in claim 2 in which the group R represents a
Claim 5
Dependent Claim
54 words
A material as claimed in claim 1 in which the group R represents a phenyl group substituted in the para or meta position relative to the anthraquinone nucleus by a group selected from lower alkyl, lower alkoxy, halo, NO 2 , OH and NR 1 R 2 where NR 1 R 2 is as
Claim 6
Dependent Claim
30 words
A material as claimed in claim 1 in which the group NR 1 R 2 is NHR 1 , where R 1 is selected from H, monocyclic aryl and alkyl
Claim 7
Dependent Claim
17 words
A material as claimed in claim 5 in which B is NHR 1 , where R 1
Claim 8
Dependent Claim
31 words
A material as claimed in claim 1 in which of the three groups A, B and C, two are --SR groups and the third is hydrogen, R being as defined in
Claim 9
Dependent Claim
30 words
A material as claimed in claim 1 in which of the three groups A, B and C, one is hydrogen and the other two are --NR 1 R 2 groups,
Claim 10
Dependent Claim
16 words
A material as claimed in claim 1 in which of the three groups A, B and
Claim 11
Dependent Claim
16 words
A material as claimed in claim 1 in which the three groups A, B and C
Claim 12
Dependent Claim
32 words
A material as claimed in claim 1 in which the three groups A, B and C are NR 1 R 2 groups, R 1 and R 2 being as defined in claim
Claim 13
Dependent Claim
30 words
A material as claimed in claim 1 in which the three groups A, B and C are respectively --SR, NR 1 R 2 and NR 1 R 2 groups; R,
Claim 14
Dependent Claim
31 words
A material as claimed in claim 1 in which the three groups A, B and C are respectively --NR 1 R 2 , --SR and --NR 1 R 2 ; R,
Claim 15
Dependent Claim
30 words
A material as claimed in claim 1 in which the three groups A, B and C are respectively --NR 1 R 2 , --NR 1 R 2 and --SR; R,
Claim 16
Dependent Claim
30 words
A material as claimed in claim 1 in which the three groups A, B and C are respectively --SR, --SR and --NR 1 R 2 ; R, R 1 and
Claim 17
Dependent Claim
31 words
A material as claimed in claim 1 in which the three groups A, B and C are respectively --SR, --NR 1 R 2 and --SR; R, R 1 and R 2
Claim 18
Dependent Claim
32 words
A material as claimed in claim 1 in which the three groups A, B and C are respectively --NR 1 R 2 , --SR and --SR; R, R 1 and R 2
Claim 19
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR18##
Claim 20
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR19##
Claim 21
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR20##
Claim 22
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR21##
Claim 23
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR22##
Claim 24
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR23##
Claim 25
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR24##
Claim 26
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR25##
Claim 27
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR26##
Claim 28
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR27##
Claim 29
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR28##
Claim 30
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR29##
Claim 31
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR30##
Claim 32
Dependent Claim
18 words
A material as claimed in claim 1 in which the compound of Formula (I) has the formula: ##STR31##
Claim 33
Dependent Claim
33 words
A material as claimed in claim 1 in which the pleochroic dye comprises a mixture of dyes at least one of which is a compound of Formula (I) as defined in claim 1.
Claim 34
Dependent Claim
32 words
A material as claimed in claim 32 in which the pleochroic dye includes a mixture of a blue dye and an orange dye, the orange dye being a compound of Formula (I).
Claim 35
Dependent Claim
28 words
A material as claimed in claim 33 in which the mixture also includes a yellow dye or a red dye or both and comprises a neutral colored mixture.
Claim 36
Dependent Claim
39 words
A material as claimed in claim 32 in which the pleochroic dye comprises a neutral colored mixture of a yellow dye, a red dye and a blue dye at least one of which is a compound of Formula (I).
Claim 37
Dependent Claim
18 words
A material as claimed in claim 1 in which the liquid crystal material comprises mainly 4-n-alkyl-or alkoxy-4'-cyanobiphenyl compounds.
Claim 38
Dependent Claim
17 words
A material as claimed in claim 1 in which the liquid crystal material comprises mainly 1-(4'-cyanophenyl)-4-n-alkyl-cyclohexane compounds.
Claim 39
Dependent Claim
36 words
A material as claimed in claim 1 in which the liquid crystal material is suitable for a cholesteric to nematic phase change effect device and comprises a nematic liquid crystal material together with a chiral agent.
Claim 40
Dependent Claim
36 words
A material as claimed in claim 36 in which the liquid crystal material is suitable for a cholesteric to nematic phase change effect device and comprises a nematic liquid crystal material together with a chiral agent.
Claim 41
Dependent Claim
36 words
A material as claimed in claim 37 in which the liquid crystal material is suitable for a cholesteric to nematic phase change effect device and comprises a nematic liquid crystal material together with a chiral agent.
Claim 42
Dependent Claim
54 words
A liquid crystal electro-optical device including two electrically insulating substrates at least one of which is optically transparent, electrodes on the inner surfaces of the substrates and a film of dielectric material contained between the substrates, wherein the improvement comprises the dielectric material being a dyed liquid crystal material as claimed in claim 1.
Claim 43
Dependent Claim
22 words
A liquid crystal device as claimed in claim 41 in which the device is a cholesteric to nematic phase change effect device.
Claim 44
Dependent Claim
18 words
A liquid crystal device as claimed in claim 41 in which the device is a Freedericksz effect device.
Claim 45
Dependent Claim
19 words
A liquid crystal device as claimed in claim 41 in which the device is a twisted nematic effect device.
References Cited (Backward Citations)
US4032219A
Cited
EP0002104A1
Cited
DE2920730A1
Cited
GB2037803A
Cited
US4299720A
Cited
US4273929A
Cited
US4232949A
Cited
US4232950A
Cited
DE3009974A1
Cited
US4304683A
Cited
JPS55127485A
Cited
DE3028593A1
Cited
EP0026004A1
Cited
EP0025809A1
Cited
DE3036853A1
Cited
DE3038372A1
Cited
GB2069518A
Cited
US4363743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |