US3728008A
Expired / Lapsed
US
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Liquid crystal display
Assignee: Olivetti SpA
•
Filing: 1971-12-01
•
Granted: 1973-04-17
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Expires: 1991-12-01
Abstract
Abstract A silane derivative is chemisorbed on the interior surfaces of the substrates of a liquid crystal display to eliminate cloudiness of the display and to increase contrast.
Inventors
- 👤 F Allan
- 👤 P Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134336; C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/56; G02F1/1337; G02F1/133711; G02F1/133719; C09K2323/00; C09K2323/06; G02F1/1339; G02F1/13392; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
26 words
The liquid crystal material of claim 1 in which said silane derivative has the chemical structure Si-Rn, where R is an organofunctional group containing an alkyl.
Claim 2
Dependent Claim
20 words
A liquid crystal display according to claim 1 further comprising a dielectric layer between said electrode and said hydrophobic film.
Claim 3
Dependent Claim
16 words
The liquid crystal display of claim 3 wherein said dielectric layer comprises an oxide of silicon.
Claim 4
Independent Claim
66 words
The method of preparing a liquid crystal display comprising the steps of: chemisorbing a film of a silane derivative to a surface of each of a pair of substrates having electrodes deposited over a portion of a surface thereof for rendering said surface hydrophobic; and confining a layer of liquid crystal material bebetween said substrates with said chemisorbed films in contact with said liquid crystal material.
Claim 5
Dependent Claim
68 words
The method of claim 5 wherein the step of chemisorbing a film of a silane derivative on the surface of said substrates includes the steps of immersing said substrates in an aqueous solution of a silane derivative having the chemical structure RnSiX4 n, where R is an alkyl, and X designates a hydrolyzable group attached to the silane derivative, washing said substrate with water, and drying said substrate.
Claim 6
Dependent Claim
52 words
The method of claim 5 wherein the step of chemisorbing a silane derivative on the surface of said substrate includes the step of immersing said substrate in the vapor of a silane derivative having the structure Rn-SiX4 n, where R is an alkyl and X designates a hydrolyzable group with the silicon.
Claim 7
Dependent Claim
62 words
The method of claim 5 wherein the step of chemisorbing a film of a silane derivative on the surface of said substrates includes the steps of immersing said substrates in a solution of a silane derivative having the chemical structure RnSiX4 n, where R is an alkyl, and X designates a hydrolyzable group attached to the silane derivative, and drying said substrates.
Claim 8
Dependent Claim
32 words
The method of claim 5 further including the step of depositing a layer of a dielectric material on said substrate, said silane derivative being chemisorbed to the surface of said dielectric layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |