Patent US2114257A successfully refreshed from Google Patents.
US4065489A
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Biphenyl esters and liquid crystalline mixtures comprising them
Assignee: Merck Patent GmbH
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Filing: 1975-10-21
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Granted: 1977-12-27
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Expires: 1995-10-21
Abstract
Abstract Biphenyl esters of the formula ##STR1## wherein X is --CO--O-- or --O--CO-- and R 1 and R 2 each are alkyl or alkoxy of 1 - 8 carbon atoms, enlarge significantly the temperature range of the nematic phase of liquid-crystalline compositions without adversely affecting other properties.
Inventors
- 👤 Rolf Steinstrasser
- 👤 Fernando Del Pino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:13
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C07; C07C; C07C51/00; C07C51/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
28 words
A biphenyl ester of the formula ##STR9## wherein X is --CO--O-- or --0--CO-- and R 1 and R 2 each are alkyl or alkoxy of 1-8 carbon atoms.
Claim 2
Dependent Claim
28 words
A biphenyl ester of the formula ##STR9## wherein X is --CO--O-- or --0--CO-- and R 1 and R 2 each are alkyl or alkoxy of 1-8 carbon atoms.
Claim 3
Dependent Claim
10 words
A biphenyl ester of claim 1 wherein X is --CO--O--.
Claim 4
Dependent Claim
10 words
A biphenyl ester of claim 1 wherein X is --O--CO--.
Claim 5
Dependent Claim
18 words
A biphenyl ester of claim 1 wherein at least one of R 1 and R 2 is alkyl.
Claim 6
Dependent Claim
15 words
A biphenyl ester of claim 4 wherein both R 1 and R 2 are alkyl.
Claim 7
Dependent Claim
29 words
A biphenyl ester of claim 5 wherein one of R 1 and R 2 is straight-chain alkyl of 1-7 carbon atoms and the other is alkyl of 3-8 atoms.
Claim 8
Dependent Claim
22 words
A biphenyl ester of claim 1 wherein one of R 1 and R 2 is alkyl and the other is straight-chain alkoxy.
Claim 9
Dependent Claim
15 words
A biphenyl ester of claim 7 wherein alkyl is straight-chain alkyl of 3-8 carbon atoms.
Claim 10
Dependent Claim
15 words
A biphenyl ester of claim 7 wherein the straight-chain alkoxy is of 1-6 carbon atoms.
Claim 11
Dependent Claim
9 words
A compound of claim 1, 4-(4-n-pentylphenyl)-benzoic acid 4'-n-pentylphenyl ester.
Claim 12
Dependent Claim
9 words
A compound of claim 1, 4-(4-n-pentylphenyl)-benzoic acid 4'-n-butylphenyl ester.
Claim 13
Dependent Claim
9 words
A compound of claim 1, 4-(4-n-pentylphenyl)-benzoic acid 4'-methoxyphenyl ester.
Claim 14
Dependent Claim
9 words
A compound of claim 1, 4-n-hexyloxybenzoic acid 4'-(4-pentylphenyl)-phenyl ester.
Claim 15
Dependent Claim
9 words
A compound of claim 1, 4-(4-n-pentylphenyl)-benzoic acid 4'-n-propylphenyl ester.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |