Patent US4921728A successfully refreshed from Google Patents.
US4921728A
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Process of making a liquid crystal element
Assignee: Ricoh Co Ltd
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Filing: 1989-08-28
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Granted: 1990-05-01
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Expires: 2009-08-28
Abstract
Abstract A liquid crystal element comprising opposed substrates, a liquid crystal nipped between said opposed substrates, and an aligning film formed on the surface of at least one of said substrates to effect substantially horizontal alignment of the liquid crystal molecules relative to said surface, which liquid crystal element is characterized by the fact that the molecules forming said aligning film are substantially aligned in themselves.
Inventors
- 👤 Yasuyuki Takiguchi
- 👤 Akihiko Kanemoto
- 👤 Kiyohiro Uehara
- 👤 Yoshio Imai
- 👤 Taro Hino
- 👤 Mitsumasa Iwamoto
- 👤 Masaaki Kakimoto
- 👤 Masaaki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:21
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
156 words
In a process of producing a liquid crystal element comprising opposed substrates, a liquid crystal nipped between said opposed substrates, and an aligning film formed on the surface of at least one of said substrates to effect substantially horizontal alignment of the liquid crystal molecules relative to said surface, the improvements which comprise forming said aligning film by (a) the Langmuir-Brodgett's technique, comprising transferring said amphipathic substance spread on a subphase onto said substrate surface, whereby a monomolecular or multimolecular layer of said amphipathic substance is directly formed as said aligning film on said substrate surface or (b) the Langmuir-Brodgett's technique, comprising transferring an amphipathic substance spread on a subphase onto said substrate surface, whereby a monomolecular or multimolecular layer of said amphipathic substance is formed on said substrate surface, followed by converting in situ of said amphipathic substance forming the resulting monomolecular or multimolecular layer thereof to the corresponding nonamphipathic substance as said aligning film.
Claim 2
Dependent Claim
156 words
In a process of producing a liquid crystal element comprising opposed substrates, a liquid crystal nipped between said opposed substrates, and an aligning film formed on the surface of at least one of said substrates to effect substantially horizontal alignment of the liquid crystal molecules relative to said surface, the improvements which comprise forming said aligning film by (a) the Langmuir-Brodgett's technique, comprising transferring said amphipathic substance spread on a subphase onto said substrate surface, whereby a monomolecular or multimolecular layer of said amphipathic substance is directly formed as said aligning film on said substrate surface or (b) the Langmuir-Brodgett's technique, comprising transferring an amphipathic substance spread on a subphase onto said substrate surface, whereby a monomolecular or multimolecular layer of said amphipathic substance is formed on said substrate surface, followed by converting in situ of said amphipathic substance forming the resulting monomolecular or multimolecular layer thereof to the corresponding nonamphipathic substance as said aligning film.
Claim 3
Dependent Claim
41 words
The improvements according to claim 1, wherein said monomolecular or multimolecular layer of a nonamphipathic substance as said aligning film is a monomolecular or multimolecular polyimide layer and the corresponding precursor amphipathic substance for the polyimide is an amphipathic polyimide precursor.
Claim 4
Dependent Claim
16 words
The improvements according to claim 1, wherein said aligning film is made of a macromolecular substance.
Claim 5
Dependent Claim
18 words
The process according to any one of claims 1-3, wherein said liquid crystal is a ferroelectric liquid crystal.
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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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |