Patent US4829154A successfully refreshed from Google Patents.
US4829154A
Expired / Lapsed
US
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Planar heater for liquid crystal element
Assignee: Stanley Electric Co Ltd
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Filing: 1987-10-15
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Granted: 1989-05-09
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Expires: 2007-10-15
Abstract
Abstract A planar heater for a liquid crystal element comprises a thin metal plate having a relatively high specific resistance such as stainless, nichrome, nickelchrome iron alloy, etc. The thin metal plate is subjected to etching-working to form a mesh-like heat generating body, opposite ends of which are provided with terminal portions for connection into an elecrtrical circuit.
Inventors
- 👤 Toru Teshima
- 👤 Kazuo Ariga
- 👤 Mitsunari Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:28
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133382; H; H05; H05B; H05B3/00; H05B3/84
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 words
A planar heater directly affixed to one major face of an electro-luminescent element characterized in that a very thin highly flexible metal plate having a relatively high specific resistance is subjected to etch-working to form a mesh-like heat generating body, opposite ends of which are provided with terminal portions for connection into an electrical circuit the mesh-like body being sufficiently rigid that it is self-supporting, whereby a supporting insulating substrate is unnecessary.
Claim 2
Dependent Claim
72 words
A planar heater directly affixed to one major face of an electro-luminescent element characterized in that a very thin highly flexible metal plate having a relatively high specific resistance is subjected to etch-working to form a mesh-like heat generating body, opposite ends of which are provided with terminal portions for connection into an electrical circuit the mesh-like body being sufficiently rigid that it is self-supporting, whereby a supporting insulating substrate is unnecessary.
Claim 3
Dependent Claim
23 words
The planar heater of claim 1 wherein the thickness of the metal plate is in the range of 30 μ to 40 μ.
References Cited (Backward Citations)
US2641675A
Cited
GB773772A
Cited
GB732710A
Cited
US3177341A
Cited
US3204084A
Cited
US4052588A
Cited
US4392013A
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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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |