Patent US4018507A successfully refreshed from Google Patents.
US4018507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device, composition therefor, and method for preparing the composition
Assignee: American Microsystems Holding Corp
•
Filing: 1974-09-05
•
Granted: 1977-04-19
•
Expires: 1994-09-05
Abstract
Abstract A nematic liquid crystal composition comprises a fluorinated Schiff base of the general formula, X--Ph--HC=N--Ph--F, where X is an alkyl, acyl, acyloxy or alkoxy group having from 1 to 10 carbon atoms, and a p-alkoxy benzylidene-p-alkyl aniline, if desired with a small amount of a p-alkoxy benzylidene-p-cyanoaniline. An electro-optical device comprises a container for a layer of the liquid crystal composition described, a layer of such composition therein, and means to supply a current across all or a selected or predetermined area of such layer to cause alignment of the liquid crystals. Methods of making the fluorinated Schiff base, the liquid crystal composition and the device are provided.
Inventors
- 👤 N.V. Vijaya Raghavan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:26
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
81 words
An electro-optical light-modulating device containing a nematic liquid crystal composition comprising an admixture of 90% to 60% by weight of (A) p-methoxy benzylidene-p-butyl aniline, and 10% to 40% by weight of (B) at least one fluorinated Schiff base having the general formula X -- Ph -- HC = N--Ph -- F, wherein X is an alkoxy group having from 1 to 10 carbon atoms, Ph is phenylene and F is fluorine, and means for applying an electric field to said admixture.
Claim 2
Dependent Claim
81 words
An electro-optical light-modulating device containing a nematic liquid crystal composition comprising an admixture of 90% to 60% by weight of (A) p-methoxy benzylidene-p-butyl aniline, and 10% to 40% by weight of (B) at least one fluorinated Schiff base having the general formula X -- Ph -- HC = N--Ph -- F, wherein X is an alkoxy group having from 1 to 10 carbon atoms, Ph is phenylene and F is fluorine, and means for applying an electric field to said admixture.
Claim 3
Dependent Claim
14 words
A device as in claim 1 wherein said fluorinated Schiff base is p-ethoxy benzylidene-p-fluoroaniline.
Claim 4
Dependent Claim
14 words
A device as in claim 1 wherein said fluorinated Schiff base is p-butoxy benzylidene-p-fluoroaniline.
Claim 5
Dependent Claim
25 words
An electro-optical light-modulating device containing a nematic liquid crystal composition comprising an admixture of 90% to 60% p-methoxy benzylidene-p-n-butylaniline and 10% to 40% p-ethoxy benzylidene-p-fluoroaniline.
Claim 6
Dependent Claim
25 words
An electro-optical light-modulating device containing a nematic liquid crystal composition comprising an admixture of 90% to 60% p-methoxy benzylidene-p-n-butylaniline and 10% to 40% p-ethoxy benzylidene-p-fluoroaniline.
Claim 7
Dependent Claim
25 words
An electro-optical light-modulating device containing a nematic liquid crystal composition comprising an admixture of 90% to 60% p-methoxy benzylidene-p-n-butylaniline and 10% to 40% p-butoxy benzylidene-p-fluoroaniline.
Claim 8
Dependent Claim
25 words
An electro-optical light-modulating device containing a nematic liquid crystal composition comprising an admixture of 90% to 60% p-methoxy benzylidene-p-n-butylaniline and 10% to 40% p-butoxy benzylidene-p-fluoroaniline.
Claim 9
Dependent Claim
27 words
A device as in claim 1 wherein said admixture comprises 0.96 gram p-methoxy benzylidene-p-n-butylaniline, 0.25 gram p-butoxy benzylidene-p-fluoroaniline, 0.12 gram p-ethoxy benzylidene-p-cyanoaniline and 0.107 gram p-ethoxy benzylidene-p-methoxyaniline.
Claim 10
Dependent Claim
30 words
A device as in claim 1 wherein said admixture contains about 4 parts by weight of said (A) compound and about 1 part by weight of said fluorinated Schiff base.
Claim 11
Dependent Claim
64 words
A nematic liquid crystal composition comprising an admixture of 90% to 60% by weight of (A) p-methoxy-benzylidene-p-butyl aniline and 10% to 40% by weight of (B) at least one fluorinated Schiff base having the general formula X--Ph -- HC = N -- Ph --F, where X is an alkoxy group having from 1 to 10 carbon atoms, Ph is phenylene, and F is fluorine.
Claim 12
Dependent Claim
64 words
A nematic liquid crystal composition comprising an admixture of 90% to 60% by weight of (A) p-methoxy-benzylidene-p-butyl aniline and 10% to 40% by weight of (B) at least one fluorinated Schiff base having the general formula X--Ph -- HC = N -- Ph --F, where X is an alkoxy group having from 1 to 10 carbon atoms, Ph is phenylene, and F is fluorine.
Claim 13
Dependent Claim
13 words
A composition as in claim 8 wherein said fluorinated Schiff base is p-ethoxybenzylidene-p-fluoroaniline.
Claim 14
Dependent Claim
13 words
A composition as in claim 8 wherein said fluorinated Schiff base is p-butoxybenzylidene-p-fluoroaniline.
Claim 15
Dependent Claim
18 words
A nematic liquid crystal composition comprising an admixture of 90% to 60% p-methoxybenzylidene-p-n-butylaniline and 10% to 40% p-ethoxybenzylidene-p-fluoraniline.
Claim 16
Dependent Claim
18 words
A nematic liquid crystal composition comprising an admixture of 90% to 60% p-methoxybenzylidene-p-n-butylaniline and 10% to 40% p-ethoxybenzylidene-p-fluoraniline.
Claim 17
Dependent Claim
18 words
A nematic liquid crystal composition comprising an admixture of 90% to 60% p-methoxybenzylidene-p-n-butylaniline and 10% to 40% p-butoxybenzylidene-p-fluoroaniline.
Claim 18
Dependent Claim
18 words
A nematic liquid crystal composition comprising an admixture of 90% to 60% p-methoxybenzylidene-p-n-butylaniline and 10% to 40% p-butoxybenzylidene-p-fluoroaniline.
Claim 19
Dependent Claim
23 words
A composition as in claim 8 wherein said admixture comprises 0.96 gram p-methoxybenzylidene-p-n-butylaniline, 0.12 gram p-ethoxybenzylidene-p-cyanoaniline, 0.107 gram p-ethoxybenzylidene-p-methoxyaniline and 0.25 gram p-butoxybenzylidene-p-fluoroaniline.
Claim 20
Dependent Claim
19 words
A composition as in claim 8 wherein said admixture contains from 15% to 40% of said fluorinated Schiff base.
Claim 21
Dependent Claim
14 words
A composition as in claim 14 containing about 25% of said fluorinated Schiff base.
Claim 22
Dependent Claim
77 words
Method of preparing a liquid crystal composition comprising admixing 90% to 60% by weight of p-methoxy-benzylidene-p-butylaniline and 10% to 40% by weight of at least one fluorinated Schiff base of the formula X -- Ph -- HC = N -- Ph -- F, where X is an alkoxy group having from 1 to 10 carbon atoms, Ph is phenylene and F is fluorine, heating said admixture until the solution becomes clear and then cooling to room temperature.
Claim 23
Dependent Claim
77 words
Method of preparing a liquid crystal composition comprising admixing 90% to 60% by weight of p-methoxy-benzylidene-p-butylaniline and 10% to 40% by weight of at least one fluorinated Schiff base of the formula X -- Ph -- HC = N -- Ph -- F, where X is an alkoxy group having from 1 to 10 carbon atoms, Ph is phenylene and F is fluorine, heating said admixture until the solution becomes clear and then cooling to room temperature.
References Cited (Backward Citations)
US3880767A
Cited
US3853785A
Cited
US3872140A
Cited
US3795436A
Cited
US3796479A
Cited
US3815972A
Cited
DE2365226A1
Cited
JPS49130882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |