US3932298A
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Nematic liquid crystals with charge-transfer acceptors as dopants
Assignee: Temple University
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Filing: 1973-07-19
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Granted: 1976-01-13
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Expires: 1993-07-19
Abstract
Abstract Nematic liquid crystal compositions including a relatively small amount of a charge-transfer acceptor dopant exhibit substantially different voltage-transmission characteristics in dynamic scattering as compared to undoped nematic liquids. Nematic compositions based on azoxy compounds and dopants of the cyano or halo tetra substituted quinone types are preferred.
Inventors
- 👤 Mortimer M. Labes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:46
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13743; G02F1/1375; C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/582
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
A nematic liquid crystal composition consisting essentially of (a) a nematic liquid selected from the group consisting of azoxy, azo, ethylenic and acetylenic linked dibenzenes, substituted at the para positions with substituents selected from the group consisting of lower alkyls and lower alkoxies and (b) a nonionic charge-transfer acceptor dopant selected from the group consisting of a tetra halo-p-benzoquinone, chloranil, 2,3-dichloro-5,6-dicyano-p-benzoquinone, and 7,7,8,8-tetracyanoquinodimethane.
Claim 2
Dependent Claim
63 words
A nematic liquid crystal composition consisting essentially of (a) a nematic liquid selected from the group consisting of azoxy, azo, ethylenic and acetylenic linked dibenzenes, substituted at the para positions with substituents selected from the group consisting of lower alkyls and lower alkoxies and (b) a nonionic charge-transfer acceptor dopant selected from the group consisting of a tetra halo-p-benzoquinone, chloranil, 2,3-dichloro-5,6-dicyano-p-benzoquinone, and 7,7,8,8-tetracyanoquinodimethane.
Claim 3
Dependent Claim
13 words
A composition, as recited in claim 1, wherein said nematic liquid is p,p'-di-n-butylazoxybenzene.
Claim 4
Dependent Claim
13 words
A composition, as recited in claim 1, wherein said nematic liquid is p,p'-di-n-pentylazoxybenzene.
Claim 5
Dependent Claim
13 words
A composition, as recited in claim 1, wherein said nematic liquid is p-methoxy-p'-n-butylazoxybenzene.
Claim 6
Dependent Claim
22 words
A composition, as recited in claim 1, wherein said nematic liquid is a binary mixture of p,p' lower dialkoxy or alkylalkoxy azoxybenzenes.
Claim 7
Dependent Claim
19 words
A composition, as recited in claim 1, wherein said dopant comprises less than 0.1%, by weight, of said composition.
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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |