US4147655A
Expired / Lapsed
US
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Liquid crystals with improved properties and devices using such liquid crystals
Assignee: Thales SA
•
Filing: 1978-01-09
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Granted: 1979-04-03
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Expires: 1998-01-09
Abstract
Abstract Novel mesomorphic substances, constituting, in certain temperature ranges, nematic or smectic liquid crystals, are compounds of the formula ##STR1## wherein Y is H or CN; R is alkyl or alkoxy of 1 to 10 carbon atoms; R' is alkyl of 1 to 10 carbon atoms or ##STR2## and X is Br, Cl or CN.
Inventors
- 👤 Jean-Claude Dubois
- 👤 Huu T. Nguyen
- 👤 Annie Zann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:06
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C07; C07C; C07C37/00; C07C37/001; C07C37/002; C09K19/2014
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
A liquid crystal compound of the formula: ##STR28## wherein: R is --OC n H 2n+1 or supressing C n H 2n+1 and n is an integer from 1 to 10; R' is alkyl of 1 to 10 carbon atoms.
Claim 2
Dependent Claim
39 words
A liquid crystal compound of the formula: ##STR28## wherein: R is --OC n H 2n+1 or supressing C n H 2n+1 and n is an integer from 1 to 10; R' is alkyl of 1 to 10 carbon atoms.
Claim 3
Dependent Claim
21 words
A compound of claim 1, wherein n is from 1 to 8 and R' is of 3 to 5 carbon atoms.
Claim 4
Dependent Claim
10 words
A mixture containing at least two compounds of claim 1.
Claim 5
Dependent Claim
11 words
The mixture of claim 3, containing the following molar composition: ##STR29##
Claim 6
Dependent Claim
13 words
The mixture of claim 3, characterized in containg the following molar composition: ##STR30##
References Cited (Backward Citations)
US3767289A
Cited
US4002670A
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US3876286A
Cited
DE2338542A1
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US4011008A
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US3951846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |