Patent US4508428A successfully refreshed from Google Patents.
US4508428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink projections on the polarizer of an electro-optic display
Assignee: Canon Inc
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Filing: 1982-02-04
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Granted: 1985-04-02
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Expires: 2002-02-04
Abstract
Abstract An electro-optic device comprising a polarizing plate or a polarizing film is characterized in that said electro-optic device is provided with a plurality of projections on at least one of the surface of the polarizing plate or the polarizing film opposing to a substrate, and the surface of the substrate opposing to the polarizing plate or film.
Inventors
- 👤 Yuji Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133528
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
An electro-optic device comprising: (a) a liquid crystal cell including first and second substrates, each having an electrode, defining a gap therebetween, the periphery of said gap being sealed with a sealing member, and said gap is filled with a liquid crystal material; (b) a first polarizing means placed at the front side of said first substrate; and (c) a second polarizing means placed at the back side of said second substrate, characterized in that a printing ink layer is formed between said first substrate and said first polarizing means at least within an effective display region of said liquid crystal cell.
Claim 2
Dependent Claim
102 words
An electro-optic device comprising: (a) a liquid crystal cell including first and second substrates, each having an electrode, defining a gap therebetween, the periphery of said gap being sealed with a sealing member, and said gap is filled with a liquid crystal material; (b) a first polarizing means placed at the front side of said first substrate; and (c) a second polarizing means placed at the back side of said second substrate, characterized in that a printing ink layer is formed between said first substrate and said first polarizing means at least within an effective display region of said liquid crystal cell.
Claim 3
Dependent Claim
26 words
An electro-optic device according to claim 1, wherein said liquid crystal material is a nematic liquid crystal having a positive dielectric anisotropy and a twisted alignment.
Claim 4
Dependent Claim
26 words
An electro-optic device according to claim 1, wherein said liquid crystal material is a nematic liquid crystal having a negative dielectric anisotropy and a twisted alignment.
Claim 5
Dependent Claim
15 words
An electro-optic device according to claim 1, wherein said liquid crystal contains a dichroic dye.
Claim 6
Dependent Claim
37 words
The electro-optic device according to claim 1 wherein said printing ink layer is formed in a pattern of a character, a letter, a numeral or a mark within said effective display region of the liquid crystal cell.
Claim 7
Dependent Claim
20 words
The electro-optic device according to claim 1, wherein a diffusion-reflector is disposed at the back of said second polarizing plate.
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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) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |