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Patent US4073742A successfully refreshed from Google Patents.
US4073742A
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Cyano-substituted biphenyl compounds and liquid crystalline dielectrics containing the same
Assignee: Merck Patent GmbH
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Filing: 1977-03-25
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Granted: 1978-02-14
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Expires: 1997-03-25
Abstract
Abstract Biphenyl derivatives of the formula: ##STR1## wherein X is --CO--O-- or --O--CO--, R 1 and R 4 are alkyl of 1 to 10 carbon atoms, and one of R 2 and R 3 is CN and the other is H, are useful for lowering the dielectric anisotropy of liquid crystalline dielectrics.
Inventors
- 👤 Dietrich Erdmann
- 👤 Rudolf Eidenschink
- 👤 Joachim Krause
- 👤 Ludwig Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:01
CPC Classifications
C; C07; C07C; C07C255/00; C07C327/00; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
A biphenyl compound of the formula ##STR7## wherein X is --CO--O or --O--CO, R 1 and R 4 are alkyl of 1-10 carbon atoms, and wherein R 2 is CN and R 3 is hydrogen when X is --O--CO and R 3 is CN and R 2 is hydrogen when X is --CO--O.
Claim 2
Dependent Claim
53 words
A biphenyl compound of the formula ##STR7## wherein X is --CO--O or --O--CO, R 1 and R 4 are alkyl of 1-10 carbon atoms, and wherein R 2 is CN and R 3 is hydrogen when X is --O--CO and R 3 is CN and R 2 is hydrogen when X is --CO--O.
Claim 3
Dependent Claim
9 words
A compound of claim 1, of the formula ##STR8##
Claim 4
Dependent Claim
9 words
A compound of claim 1, of the formula ##STR9##
Claim 5
Dependent Claim
40 words
A compound of claim 1, selected from the group consisting of: 4-n-propylbiphenyl-(4')-carboxylic acid (2-cyano-4-n-pentylphenyl) ester, 4-n-propylbiphenyl-(4')-carboxylic acid (2-cyano-4-n-heptylphenyl) ester, 4-n-pentylbiphenyl-(4')-carboxylic acid (2-cyano-4-n-butylphenyl) ester, 4-n-pentylbiphenyl-(4')-carboxylic acid (2-cyano-4-n-pentylphenyl) ester, 4-n-pentylbiphenyl-(4')-carboxylic acid (2-cyano-4-n-heptylphenyl) ester, 4-n-pentylbiphenyl-(4')-carboxylic acid (2-cyano-4-n-nonylphenyl) ester, and 4-n-heptylbiphenyl-(4')-carboxylic acid (2-cyano-4-n-heptylphenyl) ester.
Claim 6
Dependent Claim
44 words
A compound of claim 1, selected from the group consisting of: 4-n-pentylbenzoic acid 3-cyano-4'-n-butylbiphenylyl-(4)! ester, 4-n-pentylbenzoic acid 3-cyano-4'-n-pentylbiphenylyl-(4)! ester, 4-n-pentylbenzoic acid 3-cyano-4'-n-hexylbiphenylyl-(4)! ester, 4-n-pentylbenzoic acid 3-cyano-4'-n-heptylbiphenylyl-(4)! ester, 4-n-hexylbenzoic acid 3-cyano-4'-n-butylbiphenylyl-(4)! ester, 4-n-hexylbenzoic acid 3-cyano-4'-n-pentylbiphenylyl-(4)! ester, 4-n-hexylbenzoic acid 3-cyano-4'-n-hexylbiphenylyl-(4)! ester, and 4-n-butylbenzoic acid 3-cyano-4'-(2-methylpentyl)biphenylyl-(4)! ester.
Claim 7
Dependent Claim
42 words
In a liquid crystalline dielectric composition having a negative dielectric anisotropy and comprising at least one liquid crystalline compound free of --CN, --NC and NO 2 radicals, the improvement wherein the composition contains 0.5-40% by weight of a compound of claim 1.
Claim 8
Dependent Claim
42 words
In a liquid crystalline dielectric composition having a negative dielectric anisotropy and comprising at least one liquid crystalline compound free of --CN, --NC and NO 2 radicals, the improvement wherein the composition contains 1-35% by weight of a compound of claim 1.
Claim 9
Dependent Claim
42 words
In a liquid crystalline dielectric composition having a negative dielectric anisotropy and comprising at least one liquid crystalline compound free of --CN, --NC and NO 2 radicals, the improvement wherein the composition contains 5-30% by weight of a compound of claim 1.
Claim 10
Dependent Claim
42 words
In a liquid crystalline dielectric composition having a negative dielectric anisotropy and comprising at least one liquid crystalline compound free of --CN, --NC and NO 2 radicals, the improvement wherein the composition contains 0.5-40% by weight of a compound of claim 2.
Claim 11
Dependent Claim
42 words
In a liquid crystalline dielectric composition having a negative dielectric anisotropy and comprising at least one liquid crystalline compound free of --CN, --NC and NO 2 radicals, the improvement wherein the composition contains 0.5-40% by weight of a compound of claim 3.
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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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |