US4064919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of filling dynamic scattering liquid crystal devices
Assignee: RCA Corp
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Filing: 1976-11-22
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Granted: 1977-12-27
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Expires: 1996-11-22
Abstract
Abstract A dynamic scattering liquid crystal cell can be filled from a single fill port by evacuating the cell, filling with a solution of an ionic dopant in a volatile solvent, evaporating the solvent and refilling under vacuum with the dynamic scattering liquid crystal composition. Ion hang-up is avoided and only a single volume of the liquid crystal composition is required to fill the cell.
Inventors
- 👤 Herman Abraham Stern
- 👤 Howard Sorkin
- 👤 Henry Claude Schindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:56
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1341; G02B; G02B21/00; G02B21/24; G02B21/241; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A method of filling a dynamic scattering liquid crystal cell comprising a layer of a liquid crystal composition having negative dielectric anisotropy containing an ionic dopant between two electrodes, said cell having a single fill port, which comprises the steps of: evacuating said cell, immersing said cell in a solution of an ionic dopant in a volatile solvent to fill the cell with said solution, evaporating the volatile solvent leaving a film of said dopant on the inside walls of the cell, evacuating said cell, and immersing said cell in a dynamic scattering liquid crystal composition containing an ionic dopant to fill the cell.
Claim 2
Independent Claim
104 words
A method of filling a dynamic scattering liquid crystal cell comprising a layer of a liquid crystal composition having negative dielectric anisotropy containing an ionic dopant between two electrodes, said cell having a single fill port, which comprises the steps of: evacuating said cell, immersing said cell in a solution of an ionic dopant in a volatile solvent to fill the cell with said solution, evaporating the volatile solvent leaving a film of said dopant on the inside walls of the cell, evacuating said cell, and immersing said cell in a dynamic scattering liquid crystal composition containing an ionic dopant to fill the cell.
Claim 3
Dependent Claim
29 words
A method according to claim 1 wherein the doped liquid crystal composition has a resistivity of from about 1 × 10 8 to about 5 × 10 10 ohm-cm.
Claim 4
Dependent Claim
21 words
A method according to claim 1 wherein the liquid crystal composition additionally contains an effective amount of a homeotropic aligning agent.
References Cited (Backward Citations)
US3698449A
Cited
US3938242A
Cited
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 |