Patent US4053431A successfully refreshed from Google Patents.
US4053431A
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Liquid crystalline biphenyls
Assignee: Hoffmann La Roche Inc
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Filing: 1975-12-22
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Granted: 1977-10-11
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Expires: 1995-12-22
Abstract
Abstract Liquid crystalline compounds of the formula ##STR1## wherein R is as hereinafter set forth, WHICH ARE USEFUL AS DIELECTRICS IN ELECTRO-OPTICAL DEVICES, ARE DESCRIBED.
Inventors
- 👤 Hanspeter Scherrer
- 👤 Arthur Boller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:48
CPC Classifications
C; C07; C07C; C07C255/00; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/126; C09K19/42; C09K19/44
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
30 words
An electro-optical cell containing a dielectric which consists essentially of a compound of the formula ##STR13## wherein R is straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof.
Claim 2
Dependent Claim
30 words
An electro-optical cell containing a dielectric which consists essentially of a compound of the formula ##STR13## wherein R is straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof.
Claim 3
Dependent Claim
80 words
A nematic composition which comprises a compound of the formula ##STR14## wherein R is straight-chain alkyl of 3 to 8 carbon atoms or straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR15## wherein R 1 is straight-chain alkyl of 2 to 8 carbon atoms, straight-chain alkoxy of 4 to 7 carbon atoms, straight-chain alkanoyloxy of 2 to 8 carbon atoms or straight-chain alkylcarbonate of 2 to 11 carbon atoms.
Claim 4
Dependent Claim
80 words
A nematic composition which comprises a compound of the formula ##STR14## wherein R is straight-chain alkyl of 3 to 8 carbon atoms or straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR15## wherein R 1 is straight-chain alkyl of 2 to 8 carbon atoms, straight-chain alkoxy of 4 to 7 carbon atoms, straight-chain alkanoyloxy of 2 to 8 carbon atoms or straight-chain alkylcarbonate of 2 to 11 carbon atoms.
Claim 5
Dependent Claim
64 words
A nematic composition which comprises a compound of the formula ##STR16## wherein R is straight-chain alkyl of 3 to 8 carbon atoms or straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR17## wherein R 2 is straight-chain alkyl of 4 to 7 carbon atoms or straight-chain alkylcarbonate of 2 to 12 carbon atoms.
Claim 6
Dependent Claim
64 words
A nematic composition which comprises a compound of the formula ##STR16## wherein R is straight-chain alkyl of 3 to 8 carbon atoms or straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR17## wherein R 2 is straight-chain alkyl of 4 to 7 carbon atoms or straight-chain alkylcarbonate of 2 to 12 carbon atoms.
Claim 7
Dependent Claim
72 words
A nematic composition which comprises a compound of the formula ##STR18## wherein R is straight-chain alkyl of 3 to 8 carbon atoms or straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR19## wherein R 3 is straight-chain alkyl of 4 to 8 carbon atoms, straight-chain alkoxy of 5 to 8 carbon atoms or straight-chain alkylcarbonate of 3 to 11 carbon atoms.
Claim 8
Dependent Claim
72 words
A nematic composition which comprises a compound of the formula ##STR18## wherein R is straight-chain alkyl of 3 to 8 carbon atoms or straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR19## wherein R 3 is straight-chain alkyl of 4 to 8 carbon atoms, straight-chain alkoxy of 5 to 8 carbon atoms or straight-chain alkylcarbonate of 3 to 11 carbon atoms.
Claim 9
Dependent Claim
43 words
A nematic composition which comprises a compound of the formula ##STR20## wherein R is straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR21## wherein R 4 is straight-chain alkyl or straight-chain alkoxy.
Claim 10
Dependent Claim
43 words
A nematic composition which comprises a compound of the formula ##STR20## wherein R is straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR21## wherein R 4 is straight-chain alkyl or straight-chain alkoxy.
Claim 11
Dependent Claim
18 words
The nematic composition in accordance with claim 5, which comprises 4'-cyano-4-biphenylyl pentyl carbonate, 4'-cyano-4-biphenylyl heptyl carbonate and 4'-n-hexyl-4-cyanobiphenyl.
Claim 12
Dependent Claim
18 words
The nematic composition in accordance with claim 4, which comprises 4'-cyano-4-biphenylyl heptyl carbonate and p-n-heptylbenzoic acid p'-cyanophenyl ester.
Claim 13
Dependent Claim
18 words
The nematic composition in accordance with claim 5, which comprises 4'-cyano-4-biphenylyl pentyl carbonate, 4'-cyano-4-biphenylyl octyl carbonate and 4'-n-hexyl-4-cyanobiphenyl.
Claim 14
Dependent Claim
18 words
The nematic composition in accordance with claim 5, which comprises 4'-cyano-4-biphenylyl pentyl carbonate, 4'-cyano-4-biphenylyl octyl carbonate and 4'-n-heptyl-4-cyanobiphenyl.
Claim 15
Dependent Claim
17 words
The nematic composition in accordance with claim 5, which comprises 4'-cyano-4-biphenylyl octyl carbonate, 4'-cyano-4-biphenylyl hexanoate and 4'-n-heptyl-4-cyanobiphenyl.
Claim 16
Dependent Claim
18 words
The nematic composition in accordance with claim 4, which comprises 4'-cyano-4-biphenylyl octyl carbonate, p-[(p-cyanophenoxy)carbonyl]phenyl n-heptyl carbonate and 4'-n-heptyl-4-cyanobiphenyl.
Claim 17
Dependent Claim
17 words
The nematic composition in accordance with claim 2, which comprises 4'-cyano-4-biphenylyl octyl carbonate, 4'-cyano-4-biphenylyl hexanoate and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 18
Dependent Claim
18 words
The nematic composition in accordance with claim 2, which comprises 4'-cyano-4-biphenylyl octyl carbonate, 4'-cyano-4-biphenylyl pentyl carbonate and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
Claim 19
Dependent Claim
17 words
The nematic composition in accordance with claim 2, which comprises 4'-cyano-4-biphenylyl octyl carbonate, 4'-cyano-4-biphenylyl valerate and p-[(p-n-propylbenzyliden)amino]benzonitrile.
Claim 20
Dependent Claim
31 words
An electro-optical cell containing a dielectric which consists essentially of a nematic compound of the formula ##STR22## wherein R is straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof.
Claim 21
Dependent Claim
31 words
An electro-optical cell containing a dielectric which consists essentially of a nematic compound of the formula ##STR22## wherein R is straight-chain alkoxy of 3 to 10 carbon atoms, or mixtures thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |