Patent USRE28806E successfully refreshed from Google Patents.
USRE28806E
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Liquid crystal compositions
Assignee: Xerox Corp
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Filing: 1975-06-03
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Granted: 1976-05-11
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Expires: 1995-06-03
Abstract
Abstract Liquid crystalline compositions having the optical properties of the cholesteric mesophase are disclosed. The compositions comprise at least one nematic liquid crystalline material and at least one potentially cholesteric material which has a molecular structure which is similar to that of a nematic liquid crystal. Uses of the novel compositions are also described.
Inventors
- 👤 Franklin D. Saeva
- 👤 Richard L. Schank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:30
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C07; C07C; C07C291/00; C07C291/02; C07C291/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A liquid crystalline composition having the optical properties of the cholesteric liquid crystalline mesophase consisting essentially of: at least one nematic liquid crystalline material and at least one non-mesomorphic optically active material which is reprsented by the general formula selected from the group consisting of W--Ar--Z, .Iadd.and .Iaddend. .[.W--Z, and.]. W--Ar--X = Y--Ar--Z where X and Y are radicals chosen from the group consisting of .[.X = CH 2 , Y = NH.]. .[.X = Y = CH 2 .]. X = Y = CH X = CH, Y = N X = Y = N X = N, Y = N → O X = CH, Y = N → O .[.(X = Y) = C = C.]. where W and Z can be the same or different and are chosen from the group consisting of NH 2 and alkenyl, alkynyl, alkoxy, alkyl, ester, carbonate and aldehyde radicals having up to and including nine carbon atoms, and where Ar is chosen from the group consisting of ##SPC2##
Claim 2
Dependent Claim
168 words
A liquid crystalline composition having the optical properties of the cholesteric liquid crystalline mesophase consisting essentially of: at least one nematic liquid crystalline material and at least one non-mesomorphic optically active material which is reprsented by the general formula selected from the group consisting of W--Ar--Z, .Iadd.and .Iaddend. .[.W--Z, and.]. W--Ar--X = Y--Ar--Z where X and Y are radicals chosen from the group consisting of .[.X = CH 2 , Y = NH.]. .[.X = Y = CH 2 .]. X = Y = CH X = CH, Y = N X = Y = N X = N, Y = N → O X = CH, Y = N → O .[.(X = Y) = C = C.]. where W and Z can be the same or different and are chosen from the group consisting of NH 2 and alkenyl, alkynyl, alkoxy, alkyl, ester, carbonate and aldehyde radicals having up to and including nine carbon atoms, and where Ar is chosen from the group consisting of ##SPC2##
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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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |