Patent US3960748A successfully refreshed from Google Patents.
US3960748A
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Nematic liquid crystal compositions
Assignee: Eastman Kodak Co
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Filing: 1973-11-12
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Granted: 1976-06-01
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Expires: 1993-11-12
Abstract
Abstract A nematic liquid crystal composition having a resistivity of about 1 × 10 8 to 1 × 10 10 ohm-cm and a broad mesophase comprising a mixture prepared by transiminization between at least one Schiff base compound of the formula ##SPC1## And at least one other Schiff base of the formula: ##SPC2## Wherein R, R 1 , R 2 and R 3 are alkyl radicals having 1 to 18 carbon atoms. Advantageously the Schiff bases I and II are subjected to transiminization at a molar ratio of about 5/1 to 1/5.
Inventors
- 👤 Bruce H. Klanderman
- 👤 Richard T. Klingbiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:21
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
In a nematic liquid crystal composition having a resistivity of about 1 × 10 8 to 1 × 10 10 ohm-cm, the improvement wherein said composition comprises predominantly by weight a mixture resulting from the transiminization reaction between at least one Schiff base of the formula: ##SPC8## and at least one Schiff base of the formula: ##SPC9## wherein R, R 1 , R.sup. 2 and R 3 are alkyl radicals having 1 to 18 carbon atoms.
Claim 2
Dependent Claim
76 words
In a nematic liquid crystal composition having a resistivity of about 1 × 10 8 to 1 × 10 10 ohm-cm, the improvement wherein said composition comprises predominantly by weight a mixture resulting from the transiminization reaction between at least one Schiff base of the formula: ##SPC8## and at least one Schiff base of the formula: ##SPC9## wherein R, R 1 , R.sup. 2 and R 3 are alkyl radicals having 1 to 18 carbon atoms.
Claim 3
Dependent Claim
28 words
A nematic liquid crystal composition according to claim 1 wherein Schiff bases I and II are subjected to transiminization at a molar ratio of about 5/1 to 1/5.
Claim 4
Dependent Claim
35 words
A nematic liquid crystal composition according to claim 1 wherein two different Schiff bases of formula I are subjected to transiminization with said at least one Schiff base of formula II in preparing said composition.
Claim 5
Dependent Claim
28 words
A nematic liquid crystal composition according to claim 1 wherein R, R 1 , R 2 and R 3 are alkyl radicals having 1 to 8 carbon atoms.
Claim 6
Dependent Claim
52 words
A nematic liquid crystal composition according to claim 1 wherein R is --CH 3 or --C 4 H 9 , R 1 is --C 3 H 7 or --C 2 H 5 , R 2 is C 4 H 9 and R 3 is --C 5 H 11 or --CH 3 .
Claim 7
Dependent Claim
16 words
A nematic liquid crystal composition according to claim 1 consisting essentially of a mixture of: ##SPC10##
Claim 8
Dependent Claim
16 words
A nematic liquid crystal composition according to claim 1 consisting essentially of a mixture of: ##SPC11##
References Cited (Backward Citations)
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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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |