US3597591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonded flexible heater structure with an electric semiconductive layer sealed therein
Assignee: Delta Control Inc
•
Filing: 1969-09-25
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Granted: 1971-08-03
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Expires: 1989-09-25
Abstract
Abstract A bonded aluminum-semiconductive heater structure and process for preparing the same wherein a flexible, planar, semiconductive heating element, enclosed within chemically etched insulating layers of a perfluorocarbon copolymer, is bonded to the surface of an aluminum article through a similar copolymer film both surfaces of which have been rendered adherable by exposure to the action of an electrical discharge.
Inventors
- 👤 David L Van Derlip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:53
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/36; H05B2203/00; H05B2203/011; H05B2203/013; H05B2203/016; H05B2203/017; H05B2203/028; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/254
Claims Analysis
Total Claims: 0
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |