US4022934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for inducing perpendicular alignment of a nematic liquid crystal on a coated substrate
Assignee: Victor Company of Japan Ltd
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Filing: 1975-04-21
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Granted: 1977-05-10
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Expires: 1995-04-21
Abstract
Abstract A method for aligning nematic liquid crystals on a coated substrate is disclosed. The method involves a pretreatment of the coated substrate with a mixture of a long chain alcohol and an amine at elevated temperatures. Liquid crystals applied to substrates treated by this process undergo orientation such that their directors are aligned perpendicular to the surface of the coated substrates.
Inventors
- 👤 Leroy J. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133719; C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/56; C09K2323/00; C09K2323/02; C09K2323/021
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A method of inducing the perpendicular or homeotropic alignment of liquid crystals on surfaces coated with an oxide of silica comprising cleaning the surfaces of said device via conventional means, treating the surface of said device with a mixture of an aliphatic alcohol taken from the group whose formula is CH 3 (CH 2 ) n CH 2 OH where n is at least 2 and an amine at at a temperature of at least 60° C., washing said treated surface with an inert organic solvent and placing said surface in contact with the liquid crystals.
Claim 2
Independent Claim
96 words
A method of inducing the perpendicular or homeotropic alignment of liquid crystals on surfaces coated with an oxide of silica comprising cleaning the surfaces of said device via conventional means, treating the surface of said device with a mixture of an aliphatic alcohol taken from the group whose formula is CH 3 (CH 2 ) n CH 2 OH where n is at least 2 and an amine at at a temperature of at least 60° C., washing said treated surface with an inert organic solvent and placing said surface in contact with the liquid crystals.
Claim 3
Dependent Claim
46 words
The method of claim 1 wherein said alcohol-amine mixture is comprised of approximately equal weight quantities of an aliphatic alcohol, whose formula is CH 3 (CH 2 ) n CH 2 OH where n is equal to or greater than 10, and a primary aliphatic amine.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein said amine is a secondary aliphatic amine.
Claim 5
Dependent Claim
12 words
The method of claim 2 wherein said amine is a tertiary amine.
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein said liquid crystals contain a conductive dopant.
Claim 7
Dependent Claim
14 words
The method of claim 1 wherein said surface is coated with SiO 2 .
Claim 8
Dependent Claim
61 words
The method of claim 1 wherein the surface of said device are coated with a thin layer of silicon dioxide, said alcohol is an aliphatic alcohol taken from the group whose formula is CH 3 (CH 2 ) n CH 2 OH where n is equal to or greater than 2, said amine is hexylamine and said liquid crystal is N-(p-methoxybenzylidine)-p-n-butylaniline.
Claim 9
Dependent Claim
18 words
The method of claim 6 wherein said surfaces are coated with indium-tin oxide and overcoated with silicon dioxide.
References Cited (Backward Citations)
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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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |