Patent US4027950A successfully refreshed from Google Patents.
US4027950A
Expired / Lapsed
US
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Electro-optical display device
Assignee: Panasonic Holdings Corp
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Filing: 1974-08-16
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Granted: 1977-06-07
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Expires: 1994-08-16
Abstract
Abstract A non-liquid crystal organic compound having positive dielectric anisotropy is mixed with a nematic liquid crystal composition having negative dielectric anisotropy to obtain a nematic liquid crystal composition having positive dielectric anisotropy, which is used as an electro-optical element. Thus, the present invention aims at development of new use of the materials.
Inventors
- 👤 Akio Moriyama
- 👤 Masakazu Fukai
- 👤 Hiroshi Tatsuta
- 👤 Hiroaki Takahashi
- 👤 Hiroshi Esaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:23
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/582
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
An electro-optical display device comprising i. two electrode plates, at least one of which is transparent, ii. a nematic liquid crystal composition interposed between said plates, wherein said composition has positive dielectric anisotropy and consists essentially of a nematic liquid crystal material with negative dielectric anisotropy and at least one non-liquid crystal compound selected from the group consisting of ##STR7## ##STR8## iii. means for applying an electric field across said composition.
Claim 2
Dependent Claim
71 words
An electro-optical display device comprising i. two electrode plates, at least one of which is transparent, ii. a nematic liquid crystal composition interposed between said plates, wherein said composition has positive dielectric anisotropy and consists essentially of a nematic liquid crystal material with negative dielectric anisotropy and at least one non-liquid crystal compound selected from the group consisting of ##STR7## ##STR8## iii. means for applying an electric field across said composition.
Claim 3
Dependent Claim
21 words
The electro-optical display device according to claim 1, wherein said non-liquid crystal compound is selected from the group consisting of ##STR9##
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |