US3774299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for production of panel heater
Assignee: Kureha Corp
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Filing: 1971-09-20
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Granted: 1973-11-27
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Expires: 1991-09-20
Abstract
Abstract A method of producing a panel heater element by the steps of mixing carbon fiber with natural or synthetic fibers, forming the mixture into a base sheet, heat-treating the base sheet to expel volatile matter therefrom, fitting electrodes to the sheet, placing an insulative thermoplastic resin film against both surfaces of the base sheet and hot-rolling the base sheet, and finally cold-rolling the resin-coated sheet.
Inventors
- 👤 M Sato
- 👤 H Makita
- 👤 N Toyota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:26
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146; B32B27/30; B32B27/304; B32B27/32; B32B27/34; B32B27/36; B32B2323/00; B32B2323/04; B32B2323/10; B32B2327/00; B32B2327/06; B32B2367/00; B32B2377/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
The method according to claim 1 further comprising applying an electro-conductive paint to a portion of the base sheet where an electrode is to be fitted prior to placing the thermoplastic resin film against the faces of said base sheet.
Claim 2
Dependent Claim
46 words
The method according to claim 1, further including the step of impregnating said base sheet with a thermosetting resin selected from the group consisting of phenol resin, diaryl phthalate resin, epoxy resin, and furfural resin immediately after the step (a) and prior to the step (b).
References Cited (Backward Citations)
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US3168617A
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US3367851A
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US3532570A
Cited
US3481802A
Cited
US3523844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |