Patent US1012700A successfully refreshed from Google Patents.
US4098301A
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Method to provide homogeneous liquid crystal cells containing a dyestuff
Assignee: RCA Corp
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Filing: 1976-12-23
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Granted: 1978-07-04
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Expires: 1996-12-23
Abstract
Abstract Filled liquid crystal cells containing a soluble, pleochroic dyestuff are treated by heating above the nematic to isotropic liquid transition temperature until the cells appear uniformly colored.
Inventors
- 👤 Allen Bloom
- 👤 Howard Sorkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:50
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; G02F1/133; G02F1/1333; G02F1/1341
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
A method of improving the homogeneity of liquid crystal cells containing mixtures of a liquid crystal composition and a soluble, pleochroic dyestuff filled under vacuum through a single port which comprises heating a filled cell to a temperature above the nematic to isotropic transition temperature of the liquid crystal mixture until a uniform color is obtained throughout the cell.
Claim 2
Independent Claim
59 words
A method of improving the homogeneity of liquid crystal cells containing mixtures of a liquid crystal composition and a soluble, pleochroic dyestuff filled under vacuum through a single port which comprises heating a filled cell to a temperature above the nematic to isotropic transition temperature of the liquid crystal mixture until a uniform color is obtained throughout the cell.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the liquid crystal composition has positive dielectric anisotropy.
Claim 4
Dependent Claim
15 words
A method according to claim 1 wherein the liquid crystal composition has negative dielectric anisotropy.
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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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |