Patent US4230596A successfully refreshed from Google Patents.
US4230596A
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US
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Family of liquid crystals of the disubstitute diester type
Assignee: Thales SA
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Filing: 1978-08-14
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Granted: 1980-10-28
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Expires: 1998-08-14
Abstract
Abstract A family of organic compounds having at least one mesomorphic phase of nematic type and, in respect of some compounds, one or more smetic phases. The liquid crystals according to the invention satisfy general formula: ##STR1## in which R 1 is an alkyl or alkoxy group having n carbon atoms (n being an integer of 1 to 10) X designates the bromine or the cyano group, Y is a methyl group.
Inventors
- 👤 Alain Beguin
- 👤 Jean-Claude Dubois
- 👤 Annie Zann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:13
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; C07C45/00; C07C45/45; C07C45/46; C07C49/00; C07C49/76; C07C49/82; C07C49/825; C07C51/00; C07C51/347; C07C51/363
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A liquid crystal compound of the formula ##STR19## in which R 1 designates an alkyl group or alkoxy group having n carbon atoms, n being an integer of 1 to 10; R 2 designates an alkyl group having m carbon atoms, m being an integer of 1 to 10; X designates bromine or the cyano group; Y designates the methyl group.
Claim 2
Dependent Claim
61 words
A liquid crystal compound of the formula ##STR19## in which R 1 designates an alkyl group or alkoxy group having n carbon atoms, n being an integer of 1 to 10; R 2 designates an alkyl group having m carbon atoms, m being an integer of 1 to 10; X designates bromine or the cyano group; Y designates the methyl group.
Claim 3
Dependent Claim
34 words
A liquid crystal compound of claim 1, wherein R 1 is C 7 H 15 O; R 2 is C 5 H 11 ; X is Br and Y is C H 3 .
Claim 4
Dependent Claim
34 words
A liquid crystal compound of claim 1, wherein R 1 is C 8 H 17 O; R 2 is C 5 H 11 ; X is Br and Y is C H 3 .
Claim 5
Dependent Claim
34 words
A liquid crystal compound of claim 1, wherein R 1 is C 8 H 17 ; R 2 is C 5 H 11 ; X is Br and Y is C H 3 .
Claim 6
Dependent Claim
35 words
A liquid crystal compound of claim 1, wherein R 1 is C 7 H 15 O; R 2 is C 5 H 11 ; X is C N and Y is C H 3 .
Claim 7
Dependent Claim
36 words
A liquid crystal compound of claim 1, in which R 1 is C 8 H 17 O; R 2 is C 5 H 11 ; X is C N and Y is C H 3 .
Claim 8
Dependent Claim
35 words
A liquid crystal compound of claim 1, wherein R 1 is C 8 H 17 ; R 2 is C 5 H 11 ; X is C N and Y is C H 3 .
Claim 9
Dependent Claim
12 words
A mixture comprising a liquid crystal compound of claim 1, with p-pentylphenol-p-methoxybenzoate.
Claim 10
Dependent Claim
16 words
A mixture as claimed in claim 8, comprising 5 to 15% of said liquid crystal compound.
Claim 11
Dependent Claim
11 words
An electro-optical device comprising a liquid crystal compound of claim 1.
References Cited (Backward Citations)
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US3971824A
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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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |