US4043935A
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US
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Liquid crystal composition having high dielectric anisotropy and display device incorporating same
Assignee: Suwa Seikosha KK
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Filing: 1974-07-03
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Granted: 1977-08-23
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Expires: 1994-07-03
Abstract
Abstract A liquid crystal display device comprising a cell which rotates the plane of polarized light utilizing a composition of high dielectric anisotropy. The composition is stable and is at most only slightly absorptive of light.
Inventors
- 👤 Sadao Kanbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:47
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/44
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
A liquid crystal display device including a liquid crystal cell, a nematic liquid crystal composition of positive dielectric anisotropy therein, said cell being constructed for operation in the Field-Effect Mode, said liquid crystal composition consisting of at least one biphenyl compound selected from the group consisting of 4-pentyl-4'-cyanobiphenyl, 4-hexyl-4'-cyanobiphenyl, 4-heptyl-4'-cyanobiphenyl and at least one ester compound selected from the group consisting of 4-cyanophenyl-4'-butylbenzoate, 4-cyanophenyl-4'-hexylbenzoate and 4-butyl-phenyl-4'-pentylbenzoate.
Claim 2
Dependent Claim
66 words
A liquid crystal display device including a liquid crystal cell, a nematic liquid crystal composition of positive dielectric anisotropy therein, said cell being constructed for operation in the Field-Effect Mode, said liquid crystal composition consisting of at least one biphenyl compound selected from the group consisting of 4-pentyl-4'-cyanobiphenyl, 4-hexyl-4'-cyanobiphenyl, 4-heptyl-4'-cyanobiphenyl and at least one ester compound selected from the group consisting of 4-cyanophenyl-4'-butylbenzoate, 4-cyanophenyl-4'-hexylbenzoate and 4-butyl-phenyl-4'-pentylbenzoate.
Claim 3
Dependent Claim
49 words
A liquid crystal display device including a liquid crystal cell, a nematic liquid crystal composition of positive dielectric anisotropy therein, said cell being constructed for operation in the Field-Effect-Mode said liquid crystal composition consisting of 40% of 4-methoxy-4'-butylazoxybenzene, 20% of 4-methoxy-4'-pentylazoxybenzene, 20% of 4pentyl-4' -cyanobiphenyl and 20% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 4
Dependent Claim
49 words
A liquid crystal display device including a liquid crystal cell, a nematic liquid crystal composition of positive dielectric anisotropy therein, said cell being constructed for operation in the Field-Effect-Mode said liquid crystal composition consisting of 40% of 4-methoxy-4'-butylazoxybenzene, 20% of 4-methoxy-4'-pentylazoxybenzene, 20% of 4pentyl-4' -cyanobiphenyl and 20% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 5
Dependent Claim
45 words
A liquid crystal display device including a liquid crystal cell, a nematic liquid crystal composition of positive dielectric anisotropy therein, said cell being constructed for operation in the Field-Effect-Mode said liquid crystal composition consisting of 20% of 4-methoxy-4'-butylazoxybenzene, 50% of 4-pentyl-4'-cyanobiphenyl and 30% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 6
Dependent Claim
45 words
A liquid crystal display device including a liquid crystal cell, a nematic liquid crystal composition of positive dielectric anisotropy therein, said cell being constructed for operation in the Field-Effect-Mode said liquid crystal composition consisting of 20% of 4-methoxy-4'-butylazoxybenzene, 50% of 4-pentyl-4'-cyanobiphenyl and 30% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 7
Dependent Claim
47 words
A liquid crystal display device including a liquid crystal cell, a nematic liquid crystal composition of positive dielectric anisotropy therein, said cell being constructed for operation in the Field-Effect-Mode said liquid crystal composition consisting of 30% of 4-pentyl-4'-cyanobiphenyl, 20% of 4-heptyl-4'-cyanobiphenyl, 30% 4-cyanophenyl-4'-butylbenzoate and 20% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 8
Dependent Claim
47 words
A liquid crystal display device including a liquid crystal cell, a nematic liquid crystal composition of positive dielectric anisotropy therein, said cell being constructed for operation in the Field-Effect-Mode said liquid crystal composition consisting of 30% of 4-pentyl-4'-cyanobiphenyl, 20% of 4-heptyl-4'-cyanobiphenyl, 30% 4-cyanophenyl-4'-butylbenzoate and 20% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 9
Dependent Claim
65 words
A nematic liquid crystal composition having a high positive dielectric anisotropy and suitable for use in a liquid crystal cell, said cell being constructed for operation in the Field-Effect-Mode, said liquid crystal composition consisting of at least one biphenyl compound selected from the group consisting of 4-pentyl-4'-cyanobiphenyl, 4-hexyl-4'-cyanophenyl, 4-heptyl-4'-cyanobiphenyl and at least one ester compound selected from the group consisting of 4-cyanophenyl-4'-butylbenzoate, 4-cyanophenyl-4'-hexylbenzoate and 4-butylphenyl-4'-pentylbenzoate.
Claim 10
Dependent Claim
65 words
A nematic liquid crystal composition having a high positive dielectric anisotropy and suitable for use in a liquid crystal cell, said cell being constructed for operation in the Field-Effect-Mode, said liquid crystal composition consisting of at least one biphenyl compound selected from the group consisting of 4-pentyl-4'-cyanobiphenyl, 4-hexyl-4'-cyanophenyl, 4-heptyl-4'-cyanobiphenyl and at least one ester compound selected from the group consisting of 4-cyanophenyl-4'-butylbenzoate, 4-cyanophenyl-4'-hexylbenzoate and 4-butylphenyl-4'-pentylbenzoate.
Claim 11
Dependent Claim
48 words
A nematic liquid crystal composition having a high positive dielectric anisotropy and suitable for use in a liquid crystal cell, said cell being constructed for operation in the Field-Effect-Mode, said liquid crystal composition consisting of 40% of 4-methoxy-4'-butyl-azoxybenzene, 20% of 4-methoxy-4'-pentylazoxybenzene, 20% of 4-pentyl-4'-cyanobiphenyl and 20% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 12
Dependent Claim
48 words
A nematic liquid crystal composition having a high positive dielectric anisotropy and suitable for use in a liquid crystal cell, said cell being constructed for operation in the Field-Effect-Mode, said liquid crystal composition consisting of 40% of 4-methoxy-4'-butyl-azoxybenzene, 20% of 4-methoxy-4'-pentylazoxybenzene, 20% of 4-pentyl-4'-cyanobiphenyl and 20% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 13
Dependent Claim
45 words
A nematic liquid crystal composition having a high positive dielectric anisotropy and suitable for use in a liquid crystal cell, said cell being constructed for operation in the Field-Effect-Mode, said liquid crystal composition consisting of 20% of 4-methoxy-4'-butylazoxybenzene, 50% of 4-pentyl-4'-cyanobiphenyl and 30% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 14
Dependent Claim
45 words
A nematic liquid crystal composition having a high positive dielectric anisotropy and suitable for use in a liquid crystal cell, said cell being constructed for operation in the Field-Effect-Mode, said liquid crystal composition consisting of 20% of 4-methoxy-4'-butylazoxybenzene, 50% of 4-pentyl-4'-cyanobiphenyl and 30% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 15
Dependent Claim
48 words
A nematic liquid crystal composition having a high positive dielectric anisotropy and suitable for use in a liquid crystal cell, said cell being constructed for operation in the Field-Effect-Mode, said liquid crystal composition consisting of 30% of 4-pentyl-4'-cyanobiphenyl, 20% of 4-heptyl-4'-cyanodiphenyl, 30% of 4-cyanophenyl-4'-butylbenzoate and 20% of 4-cyanophenyl-4'-hexylbenzoate.
Claim 16
Dependent Claim
48 words
A nematic liquid crystal composition having a high positive dielectric anisotropy and suitable for use in a liquid crystal cell, said cell being constructed for operation in the Field-Effect-Mode, said liquid crystal composition consisting of 30% of 4-pentyl-4'-cyanobiphenyl, 20% of 4-heptyl-4'-cyanodiphenyl, 30% of 4-cyanophenyl-4'-butylbenzoate and 20% of 4-cyanophenyl-4'-hexylbenzoate.
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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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |