US3698449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of liquid crystal devices
Assignee: RCA Corp
•
Filing: 1971-06-23
•
Granted: 1972-10-17
•
Expires: 1991-06-23
Abstract
Abstract To provide a uniform composition of the liquid crystal material throughout the device, the interior surfaces of the device are coated or contacted, prior to filling with the liquid crystal material, with certain additive materials normally contained in the liquid crystal material to improve the device performance.
Inventors
- 👤 Howard Sorkin
- 👤 Richard Ira Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:57
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/582; G02F1/1341
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
33 words
The method as in claim 1 wherein said pre-contacting step comprises flowing a medium containing a preselected proportion of said additive material through said container to thoroughly flush said container with said medium.
Claim 2
Dependent Claim
36 words
The method as in claim 2 wherein said flowing step comprises using a medium in which said proportion of additive material therein is greater than the proportion of said additive material in said liquid crystal material.
Claim 3
Independent Claim
84 words
A method of fabricating a liquid crystal device comprising a container and a filling including a mixture of a liquid crystal and an additive material, said additive material tending to be taken up by the walls of said container and thereby depleted from said mixture, said method comprising: flushing said container with additive material; and then filling said container with said mixture; said flushing step serving to prevent depletion of said additive material from said mixture placed in said container by said filling step.
References Cited (Backward Citations)
US2433177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |