US4058478A
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Liquid crystal esters
Assignee: Hoffmann La Roche Inc
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Filing: 1975-08-20
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Granted: 1977-11-15
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Expires: 1995-08-20
Abstract
Abstract Liquid crystal substances or compounds of the formula <IMAGE> I wherein R is as hereinafter set forth, AS WELL AS COMPOSITIONS AND ELECTRO-OPTICAL APPARATUSES CONTAINING THEM ARE DESCRIBED.
Inventors
- 👤 Arthur Boller
- 👤 Hanspeter Scherrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:51
CPC Classifications
C; C07; C07C; C07C255/00; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/42; C09K19/46; C09K2019/2035
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
25 words
A nematic composition which comprises two or more compounds of the formula ##STR12## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms.
Claim 2
Dependent Claim
25 words
A nematic composition which comprises two or more compounds of the formula ##STR12## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms.
Claim 3
Dependent Claim
22 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-n-heptylbenzoic acid p'-cyanophenyl ester and p-n-butylbenzoic acid p'-cyanophenyl ester.
Claim 4
Dependent Claim
22 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-n-heptylbenzoic acid p'-cyanophenyl ester and p-n-pentylbenzoic acid p'-cyanophenyl ester.
Claim 5
Dependent Claim
22 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-n-octylbenzoic acid p'-cyanophenyl ester and p-n-butylbenzoic acid p'-cyanophenyl ester.
Claim 6
Dependent Claim
22 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-n-octylbenzoic acid p'-cyanophenyl ester and p-n-hexylbenzoic acid p'-cyanophenyl ester.
Claim 7
Dependent Claim
22 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-n-hexylbenzoic acid p'-cyanophenyl ester and p-n-butylbenzoic acid p'-cyanophenyl ester.
Claim 8
Dependent Claim
36 words
A nematic composition which comprises an ester of the formula ##STR13## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof and one or more nematic compounds having a positive anisotropy.
Claim 9
Dependent Claim
36 words
A nematic composition which comprises an ester of the formula ##STR13## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof and one or more nematic compounds having a positive anisotropy.
Claim 10
Dependent Claim
64 words
A nematic composition which comprises an ester of the formula ##STR14## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof, and a Schiffs' base of the formula ##STR15## wherein R' is straight-chain lower alkyl of 2 to 8 carbon atoms, straight-chain lower alkoxy of 4 to 7 atoms, or straight-chain lower alkanoyloxy of 2 to 8 carbon atoms.
Claim 11
Dependent Claim
64 words
A nematic composition which comprises an ester of the formula ##STR14## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof, and a Schiffs' base of the formula ##STR15## wherein R' is straight-chain lower alkyl of 2 to 8 carbon atoms, straight-chain lower alkoxy of 4 to 7 atoms, or straight-chain lower alkanoyloxy of 2 to 8 carbon atoms.
Claim 12
Dependent Claim
27 words
A dielectric for electro-optical purposes which comprises two or more compounds ##STR16## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof.
Claim 13
Dependent Claim
27 words
A dielectric for electro-optical purposes which comprises two or more compounds ##STR16## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof.
Claim 14
Dependent Claim
38 words
A dielectric for electro-optical purposes, which comprises a nematic ester of the formula ##STR17## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof and one or more nematic compounds having positive anisotropy.
Claim 15
Dependent Claim
38 words
A dielectric for electro-optical purposes, which comprises a nematic ester of the formula ##STR17## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof and one or more nematic compounds having positive anisotropy.
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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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |