US3941453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Birefringent compounds used in Kerr cells
Assignee: US Philips Corp
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Filing: 1974-11-13
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Granted: 1976-03-02
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Expires: 1994-11-13
Abstract
Abstract Molecules with a group X which attracts electrons and comprises π-electrons and conjugated therewith a group R which supplies electrons, of the formula R -- X in which X represents --COCF 3 , --COC 6 H 5 or --SO n CF 3 , n being 0 or 2, and R represents phenyl or (CH 3 ) 2 N, as electrooptically active liquid inter alia have the advantage that they are achromatic compared with nitrobenzene.
Inventors
- 👤 Uwe Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:36
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/76; C07C49/782; C07C49/784; C07C49/786; C07C49/80; G; G02; G02F; G02F1/00; G02F1/01; G02F1/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A Kerr cell, characterized in that its electro-optically active liquid consists of molecules with a group X which attracts electrons and comprises π -electrons and a group R which is conjugated therewith and supplies electrons, of the formula R--X in which X = --COCF 3 , --COC 6 H 5 or --SO n CF 3 , n being 0 or 2, and R = phenyl or (CH 3 ) 2 N.
Claim 2
Dependent Claim
71 words
A Kerr cell, characterized in that its electro-optically active liquid consists of molecules with a group X which attracts electrons and comprises π -electrons and a group R which is conjugated therewith and supplies electrons, of the formula R--X in which X = --COCF 3 , --COC 6 H 5 or --SO n CF 3 , n being 0 or 2, and R = phenyl or (CH 3 ) 2 N.
Claim 3
Dependent Claim
18 words
A Kerr cell as claimed in claim 1, characterized in that its electro-optically active liquid consists of N,N-dimethyltrifluoroacetamide.
Claim 4
Dependent Claim
18 words
A Kerr cell as claimed in claim 1, characterized in that its electro-optically active liquid consists of phenyltrifluoromethylsulphone.
Claim 5
Dependent Claim
18 words
A Kerr cell as claimed in claim 1, characterized in that its electro-optically active liquid consists of N,N-dimethyltrifluoromethylsulphonamide.
Claim 6
Dependent Claim
18 words
A Kerr cell as claimed in claim 1, characterized in that its electro-optically active liquid consists of N,N-diethyltrifluoroacetamide.
Claim 7
Dependent Claim
18 words
A Kerr cell as claimed in claim 1, characterized in that its electro-optically active liquid consists of N,N-diethylbenzamide.
Claim 8
Dependent Claim
18 words
A Kerr cell as claimed in claim 1, characterized in that its electro-optically active liquid consists of phenyltrifluoromethylsulphide.
Claim 9
Dependent Claim
28 words
A Kerr cell as claimed in claim 1, characterized in that its electro-optically active liquid consists of a mixture of at least two compounds of the formula R--X.
References Cited (Backward Citations)
US3408133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |