US4802740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal alignment layer containing polyvinyl-alcohol and titanium-alkoxide
Assignee: Canon Inc
•
Filing: 1986-02-11
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Granted: 1989-02-07
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Expires: 2006-02-11
Abstract
Abstract A liquid crystal device comprising an alignment-controlling film formed by applying an aqueous solution containing one part by weight of polyvinyl alcohol and 2 to 4 parts by weight of titanium alkoxide to a substrate surface, followed by heating.
Inventors
- 👤 Yoshio Hotta
- 👤 Kenji Ohnuma
- 👤 Akihiko Komura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:02
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A liquid crystal device, which comprises an alignment-controlling film formed by applying on a substrate a water solution comprising polyvinyl alcohol and titanium alkoxide, followed by heating, said titanium alkoxide being contained in a proportion of more than 2 parts by weight and not more than 4 parts by weight per part by weight of polyvinyl alcohol.
Claim 2
Dependent Claim
57 words
A liquid crystal device, which comprises an alignment-controlling film formed by applying on a substrate a water solution comprising polyvinyl alcohol and titanium alkoxide, followed by heating, said titanium alkoxide being contained in a proportion of more than 2 parts by weight and not more than 4 parts by weight per part by weight of polyvinyl alcohol.
Claim 3
Dependent Claim
21 words
A liquid crystal device according to claim 1, wherein the polyvinyl alcohol has a degree of polymerization of 1,000 to 3,000.
Claim 4
Dependent Claim
21 words
A liquid crystal device according to claim 1, wherein the polyvinyl alcohol has a degree of saponification of 98 to 100%.
Claim 5
Dependent Claim
27 words
A liquid crystal device according to claim 1, wherein the polyvinyl alcohol is reactive polyvinyl alcohol having a functional group on a part of the main chain.
Claim 6
Dependent Claim
16 words
A liquid crystal device according to claim 4, wherein the functional group is a carboxyl group.
Claim 7
Dependent Claim
17 words
A liquid crystal device according to claim 1, wherein the titanium alkoxide is di-isopropoxy-bis(acetylacetonate)titanium, di-n-butoxy-bis-(triethanolaminate)titanium, or dihydroxy-bis-(lactato)titanium.
Claim 8
Dependent Claim
20 words
A liquid crystal device according to claim 1, wherein the alignment-controlling film has a thickness of 800 to 2,000 Å.
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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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |