US4147651A
Expired / Lapsed
US
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Biphenyl based liquid crystal compositions
Assignee: WALTER E HELLER WESTERN Inc
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Filing: 1974-09-03
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Granted: 1979-04-03
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Expires: 1994-09-03
Abstract
Abstract Nematic liquid crystal compositions containing 4'-substituted-4-cyanobiphenyl and 4, 4'-disubstituted phenyl benzoate liquid crystal compositions which can be actuated at low voltages, e.g., under 3.5 Vrms in a 12.5 micron thick twisted nematic liquid crystal display.
Inventors
- 👤 Chan S. Oh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:00
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
Nematic liquid crystals having biphenyl liquid crystal dominant electro-optic characteristics and a wide nematic phase temperature range including ambient temperature actuatable in a 12.5 micron thick twisted nematic liquid crystal display cell by an actuation voltage of less than about 3.5 Vrms comprising one or more compounds selected from 4'-substituted-4-cyanobiphenyl liquid crystals having the formula ##STR35## wherein r is a 1 to 9 carbon alkyl or alkoxy group, blended with one or more compatible 4,4'-disubstituted phenyl benzoate liquid crystals selected from the group consisting of: compounds having the formula ##STR36## wherein one of R and R' is methoxy and R the other of and R' is 1 to 7 carbon atom alkyl or alkoxy groups; and compounds having the formula ##STR37## wherein R and R' are 1 to 7 carbon alkyl groups, a or b being chlorine, and the other of a or b being hydrogen.
Claim 2
Dependent Claim
146 words
Nematic liquid crystals having biphenyl liquid crystal dominant electro-optic characteristics and a wide nematic phase temperature range including ambient temperature actuatable in a 12.5 micron thick twisted nematic liquid crystal display cell by an actuation voltage of less than about 3.5 Vrms comprising one or more compounds selected from 4'-substituted-4-cyanobiphenyl liquid crystals having the formula ##STR35## wherein r is a 1 to 9 carbon alkyl or alkoxy group, blended with one or more compatible 4,4'-disubstituted phenyl benzoate liquid crystals selected from the group consisting of: compounds having the formula ##STR36## wherein one of R and R' is methoxy and R the other of and R' is 1 to 7 carbon atom alkyl or alkoxy groups; and compounds having the formula ##STR37## wherein R and R' are 1 to 7 carbon alkyl groups, a or b being chlorine, and the other of a or b being hydrogen.
Claim 3
Dependent Claim
27 words
Liquid crystals as defined in claim 1 wherein said 4'-substituted-4-cyanobiphenyl liquid crystals comprise from about 10 percent to about 80 mole percent of the liquid crystal composition.
Claim 4
Dependent Claim
12 words
liquid crystals as defined in claim 1 wherein the 4'-substituted-4-cyanobiphenyl is 4-cyano-4'-n-pentylbiphenyl.
Claim 5
Dependent Claim
15 words
Liquid crystals as defined in claim 1 wherein the 4,4'-disubstituted phenyl benzoate ester is 4'-n-pentylphenyl-3-chloro-4-(4'-n-pentylbenzoyloxy)benzoate.
Claim 6
Dependent Claim
30 words
Liquid crystals as defined in claim 1 further comprising at least one compound having a formula ##STR38## wherein R is a 1 to 9 carbon atom alkyl or alkoxy group.
Claim 7
Dependent Claim
27 words
Liquid crystals as defined in claim 5 wherein said 4'-substituted-4-cyanobiphenyl liquid crystals comprise from about 10 percent to about 80 mole percent of the liquid crystal composition.
Claim 8
Dependent Claim
27 words
Liquid crystals as defined in claim 5 comprising a positive dielectric anisotropy constituent which includes said 4'-substituted-4-cyanobiphenyl and up to about 60 mole percent of said cyanoester.
Claim 9
Dependent Claim
12 words
Liquid crystals as defined in claim 5 wherein the 4'-substituted-4-cyanobiphenyl is 4-cyano-4'-n-pentylbiphenyl.
Claim 10
Dependent Claim
15 words
Liquid crystals as defined in claim 5 wherein the 4,4'-disubstituted phenyl benzoate ester is 4'-n-pentylphenyl-3-chloro-4-(4'-n-pentylbenzoyloxy)benzoate.
Claim 11
Dependent Claim
24 words
Liquid crystals as defined in claim 9 wherein said compound having the formula ##STR39## is selected from a group consisting of 4'-cyanophenyl-4-n-heptylbenzoate and 4'-cyanophenyl-4-n-butylbenzoate.
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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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |