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

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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 09:48

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

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.

References Cited (Backward Citations)

US3947375A Cited

US3974087A Cited

US4137192A Cited

US4083797A Cited

US4143947A Cited

US4130502A Cited

US4128497A Cited

US4154697A Cited

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

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