US4527862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display keyboard
Assignee: Canon Inc
•
Filing: 1983-12-01
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Granted: 1985-07-09
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Expires: 2003-12-01
Abstract
Abstract A liquid crystal display keyboard has a keyboard which is arranged on a liquid crystal display and has upper and lower conductive films each having transparent electrodes arranged in spaced and facing relation to each other. An elastic member is arranged on the upper transparent conductive film.
Inventors
- 👤 Kazuhiro Arakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:57
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/0412; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/13338; G06F3/047
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
A liquid crystal display keyboard including a keyboard having upper and lower transparent conductive films each having transparent electrodes said keyboard being arranged on a liquid crystal display in a spaced and facing relation, characterized in that an elastic member is arranged on said upper transparent conductive film.
Claim 2
Dependent Claim
48 words
A liquid crystal display keyboard including a keyboard having upper and lower transparent conductive films each having transparent electrodes said keyboard being arranged on a liquid crystal display in a spaced and facing relation, characterized in that an elastic member is arranged on said upper transparent conductive film.
Claim 3
Dependent Claim
36 words
A liquid crystal display keyboard according to claim 1, wherein the elastic member is an elastic film and is bonded together with a protecting film therefore to an upper surface of said upper transparent conductive film.
Claim 4
Dependent Claim
43 words
A liquid crystal display keyboard according to claim 1, wherein a transparent film is bonded by an adhesive material to an upper surface of said upper transparent conductive film and a hardened layer is formed on an upper surface of said transparent film.
Claim 5
Dependent Claim
49 words
A liquid crystal display keyboard comprising: a liquid crystal display; a pair of transparent electrodes arranged on said liquid crystal display; a flexible transparent film for holding one of said pair of transparent electrodes; and a second transparent film bonded by an adhesive material to said flexible transparent film.
Claim 6
Dependent Claim
49 words
A liquid crystal display keyboard comprising: a liquid crystal display; a pair of transparent electrodes arranged on said liquid crystal display; a flexible transparent film for holding one of said pair of transparent electrodes; and a second transparent film bonded by an adhesive material to said flexible transparent film.
Claim 7
Dependent Claim
20 words
A liquid crystal display keyboard according to claim 4, wherein said second transparent film has a hardened layer formed thereon.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |