US3827780A
Expired / Lapsed
US
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Stable anil-type nematic liquid crystals
Assignee: Temple University
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Filing: 1971-10-14
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Granted: 1974-08-06
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Expires: 1991-10-14
Abstract
Abstract Stable anil-type nematic liquid crystals are provided of the formula WHEREIN R1 and R2 are each an alkyl, alkoxy, alkylester, aryl, aryloxy, arylester, aralkyl, carboxylic acid, halogen, nitro, cyano group or the like. The liquid crystals of this invention, because of the excellent stability, are especially useful in light valves, optical display devices and similar applications which involve the modulation of light.
Inventors
- 👤 M Labes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:06
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
The compound according to claim 1 wherein said R1 and R2 are selected from the group consisting of alkyl, alkoxy or alkylester having 1-7 carbon atoms; carboxylic acid; halogen; nitro and cyano.
Claim 2
Dependent Claim
9 words
The compound according to claim 1 of the formula
Claim 3
Dependent Claim
63 words
An electro-optical device comprising two electrodes, one of which is transparent and between which is disposed a nematic liquid crystal film wherein said nematic liquid crystal film is subjected to an electric field to cause rearrangement of the nematic liquid crystals to effect dynamic light scattering, and wherein also said nematic liquid crystal film is composed of the compound recited in claim 1.
References Cited (Backward Citations)
US3597044A
Cited
US3625591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |