US4228030A
Expired / Lapsed
US
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Liquid crystal compositions
Assignee: Amespace Inc
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Filing: 1979-02-28
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Granted: 1980-10-14
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Expires: 1999-02-28
Abstract
Abstract Novel liquid crystal compositions having extended temperature ranges, without sacrifice of stability, are provided by mixing 10-25%, by weight, of a terphenyl liquid crystal material with 75-90%, by weight, of a four-component liquid crystal composition of cyclohexanes.
Inventors
- 👤 Herbert S. Cole, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:54
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A liquid crystal composition with a solid-to-nematic transition temperature of at most 0° C. and a nematic-to-isotropic transition temperature of at least 85° C. consisting of: about 85% to about 100%, by weight, of a liquid crystal host composition consisting of about 83% to about 90%, by weight, of a 4-part liquid crystal mixture consisting of about 21% to about 24% by weight of trans-4-n-Propyl-(4-cyanophenyl)-cyclohexane, having a chemical formula ##STR8## about 32% to about 36%, by weight, of trans-4-n-Pentyl-(4-cyanophenyl)-cyclohexane, having a chemical formula ##STR9## about 22% to about 25%, by weight, of trans-4-n-Heptyl-(4-cyanophenyl)-cyclohexane, having a chemical formula ##STR10## and about 15% to about 25%, by weight, of trans-4-n-Pentyl-(4'-cyanobiphenyl-4)-cyclohexane, having a chemical formula ##STR11## about 10% to about 17%, by weight, of 4-n-Pentyl-4"-cyano-p-terphenyl, having the chemical formula ##STR12## about 0% to about 5%, by weight, of an optically-active material dissolved in said host composition; and; about 0% to about 10%, by weight, of a dichroic dye dissolved in said host composition.
Claim 2
Dependent Claim
160 words
A liquid crystal composition with a solid-to-nematic transition temperature of at most 0° C. and a nematic-to-isotropic transition temperature of at least 85° C. consisting of: about 85% to about 100%, by weight, of a liquid crystal host composition consisting of about 83% to about 90%, by weight, of a 4-part liquid crystal mixture consisting of about 21% to about 24% by weight of trans-4-n-Propyl-(4-cyanophenyl)-cyclohexane, having a chemical formula ##STR8## about 32% to about 36%, by weight, of trans-4-n-Pentyl-(4-cyanophenyl)-cyclohexane, having a chemical formula ##STR9## about 22% to about 25%, by weight, of trans-4-n-Heptyl-(4-cyanophenyl)-cyclohexane, having a chemical formula ##STR10## and about 15% to about 25%, by weight, of trans-4-n-Pentyl-(4'-cyanobiphenyl-4)-cyclohexane, having a chemical formula ##STR11## about 10% to about 17%, by weight, of 4-n-Pentyl-4"-cyano-p-terphenyl, having the chemical formula ##STR12## about 0% to about 5%, by weight, of an optically-active material dissolved in said host composition; and; about 0% to about 10%, by weight, of a dichroic dye dissolved in said host composition.
Claim 3
Dependent Claim
53 words
The liquid crystal composition of claim 1, wherein the liquid crystal host composition has about 90%, by weight, of the 4-part liquid crystal mixture, with about 24%, 36%, 25% and 15%, respectively, of said 4-part mixture being the respective first through fourth constituents thereof; and about 10%, by weight, of the terphenyl constituent.
Claim 4
Dependent Claim
53 words
The liquid crystal composition of claim 1, wherein the liquid crystal host composition has about 83%, by weight, of the 4-part liquid crystal mixture, with about 24%, 36%, 25% and 15%, respectively, of said 4-part mixture being the respective first through fourth constituents thereof; and about 17%, by weight, of the terphenyl constituent.
Claim 5
Dependent Claim
53 words
The liquid crystal composition of claim 1, wherein the liquid crystal host composition has about 85%, by weight, of the 4-part liquid crystal mixture, with about 21%, 32%, 22% and 25%, respectively, of said 4-part mixture being the respective first through fourth constituents thereof; and about 15%, by weight, of the terphenyl constituent.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |