US4058477A
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Liquid crystal Schiffs bases
Assignee: Hoffmann La Roche Inc
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Filing: 1975-09-08
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Granted: 1977-11-15
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Expires: 1995-09-08
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
2026-10-25 13:16
CPC Classifications
C; C07; C07C; C07C255/00; C07C45/00; C07C45/51; C07C45/511; C07C45/513; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; C09K19/42; C09K19/48; C09K19/20; C09K19/2007; C09K2019/2035
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
25 words
A nematic composition which comprises two or more compounds of the formula ##STR11## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, isohexyl, n-hexyl, n-heptyl or n-octyl.
Claim 2
Dependent Claim
25 words
A nematic composition which comprises two or more compounds of the formula ##STR11## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, isohexyl, n-hexyl, n-heptyl or n-octyl.
Claim 3
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-ethylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 4
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-propylbenzyliden)amion]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 5
Dependent Claim
22 words
A nematic composition in accordance with claim 1, which comprises a mixture of one part of p-[(p-n-propylbenzyliden)amino]-benzonitrile and two parts of p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 6
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-butylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 7
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-pentylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 8
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-heptylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 9
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-octylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 10
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-propylbenzyliden)amino]benzonitrile and p-[(p-n-heptylbenzyliden)amino]benzonitrile.
Claim 11
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-butylbenzyliden)amino]benzonitrile and p-[(p-n-heptylbenzyliden)amino]benzonitrile.
Claim 12
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-pentylbenzyliden)amino]benzonitrile and p-[(p-n-heptylbenzyliden)amino]benzonitrile.
Claim 13
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-propylbenzyliden)amino]benzonitrile and p-[(p-n-octylbenzyliden)amino]benzonitrile.
Claim 14
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-butylbenzyliden)amino]benzonitrile and p-[(p-n-octylbenzyliden)amino]benzonitrile.
Claim 15
Dependent Claim
16 words
A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-pentylbenzyliden)amino]benzonitrile and p-[(p-n-octylbenzyliden)amino]benzonitrile.
Claim 16
Dependent Claim
37 words
A nematic composition which comprises a Schiffs' base of the formula ##STR12## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl, or mixtures thereof and one or more nematic compounds having a positive anisotropy.
Claim 17
Dependent Claim
37 words
A nematic composition which comprises a Schiffs' base of the formula ##STR12## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl, or mixtures thereof and one or more nematic compounds having a positive anisotropy.
Claim 18
Dependent Claim
46 words
A nematic composition which comprises a compound of the formula ##STR13## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl, or mixtures thereof, and a compound of the formula ##STR14## wherein R 1 is straight-chain lower alkyl of 4 to 7 carbon atoms.
Claim 19
Dependent Claim
46 words
A nematic composition which comprises a compound of the formula ##STR13## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl, or mixtures thereof, and a compound of the formula ##STR14## wherein R 1 is straight-chain lower alkyl of 4 to 7 carbon atoms.
Claim 20
Dependent Claim
56 words
A nematic composition which comprises a compound of the formula ##STR15## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl, or mixtures thereof, and a compound of the formula ##STR16## wherein R 2 is straight-chain lower alkyl of 4 to 7 carbon atoms or straight-chain lower alkanoyl of 2 to 8 carbon atoms.
Claim 21
Dependent Claim
56 words
A nematic composition which comprises a compound of the formula ##STR15## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl, or mixtures thereof, and a compound of the formula ##STR16## wherein R 2 is straight-chain lower alkyl of 4 to 7 carbon atoms or straight-chain lower alkanoyl of 2 to 8 carbon atoms.
Claim 22
Dependent Claim
56 words
A nematic composition which comprises a compound of the formula ##STR17## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl, or mixtures thereof, and a compound of the formula ##STR18## wherein R 2 is straight-chain lower alkyl of 4 to 8 carbon atoms or straight-chain lower alkoxy of 5 to 8 carbon atoms.
Claim 23
Dependent Claim
56 words
A nematic composition which comprises a compound of the formula ##STR17## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl, or mixtures thereof, and a compound of the formula ##STR18## wherein R 2 is straight-chain lower alkyl of 4 to 8 carbon atoms or straight-chain lower alkoxy of 5 to 8 carbon atoms.
Claim 24
Dependent Claim
16 words
A nematic composition in accordance with claim 16, wherein the compound of formula I is p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 25
Dependent Claim
16 words
A nematic composition in accordance with claim 17, wherein the compound of formula I is p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 26
Dependent Claim
16 words
A nematic composition in accordance with claim 18, wherein the compound of formula I is p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 27
Dependent Claim
39 words
A dielectric for electro-optical purposes, which comprises a nematic Schiffs' base of the formula ##STR19## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, isohexyl, n-hexyl, n-heptyl or n-octyl, or mixtures thereof and one or more nematic compounds having positive anisotropy.
Claim 28
Dependent Claim
39 words
A dielectric for electro-optical purposes, which comprises a nematic Schiffs' base of the formula ##STR19## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, isohexyl, n-hexyl, n-heptyl or n-octyl, 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 |