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Patent US3584198A successfully refreshed from Google Patents.
US3584198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible electric surface heater
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1969-02-25
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Granted: 1971-06-08
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Expires: 1989-02-25
Abstract
Abstract A flexible electric surface heater comprises at least two flexible and heatproof plastic films and an electrically heat generating metal foil formed in a zigzag form between said plastic films through a thermoplastic resin as a filler. An excess heat detecting electrode is embedded also between the plastic films along the zigzag metal foil so as to oppose thereto with a fixed distance through the filler, and is connected to a protective device for interrupting power supply when extraordinary heat is detected at the electrode. The surface heater is continuously manufactured by laminating the metal foil on one of the plastic, forming the zigzag heater line as well as the electrode by means of an etching process, and further laminating another plastic film.
Inventors
- 👤 Kazuo Doi
- 👤 Ryuzo Kato
- 👤 Tadashi Matsumoto
- 👤 Fujio Niizuma
- 👤 Shigenori Kugumiya
- 👤 Yasuo Tanaka
- 👤 Motoharu Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:15
CPC Classifications
B; B32; B32B; B32B37/00; B32B37/14; B32B37/15; B32B37/153; F; F24; F24D; F24D13/00; F24D13/02; H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/28; H05B3/286; H05B3/34; H05B3/36; H05B2203/00; H05B2203/002; H05B2203/004; H05B2203/014; H05B2203/017; H05B2203/026; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
A flexible, crack resistant electric surface heater comprising the combination of a metal foil heat generating element, terminals for connecting said heat generating element to an electrical source of energy at least two insulating plastic films disposed on opposite sides of and surrounding said heat generating element, said heat generating element being continuously bonded to said insulating elements by an adhesive bonding agent, said heating element is formed in a zigzag pattern and said bonding agent is a thermoplastic resin which is utilized as a filler element to completely surround said heat generating element, completely filling the empty spaces created by said heat generating element being formed in a zigzag pattern, and completely filling any cavities existing in the surface of said heating element so that there are substantially no voids or airspaces within the enclosure created by said insulating elements and said metal foil heat generating element and said plastic insulating elements being constructed of materials having substantially identical thermal coefficients of expansion, said thermal coefficients of expansion are within the range of 2.0 X 10/* C. to 4.0 X 10/* C.
Claim 2
Dependent Claim
183 words
A flexible, crack resistant electric surface heater comprising the combination of a metal foil heat generating element, terminals for connecting said heat generating element to an electrical source of energy at least two insulating plastic films disposed on opposite sides of and surrounding said heat generating element, said heat generating element being continuously bonded to said insulating elements by an adhesive bonding agent, said heating element is formed in a zigzag pattern and said bonding agent is a thermoplastic resin which is utilized as a filler element to completely surround said heat generating element, completely filling the empty spaces created by said heat generating element being formed in a zigzag pattern, and completely filling any cavities existing in the surface of said heating element so that there are substantially no voids or airspaces within the enclosure created by said insulating elements and said metal foil heat generating element and said plastic insulating elements being constructed of materials having substantially identical thermal coefficients of expansion, said thermal coefficients of expansion are within the range of 2.0 X 10/* C. to 4.0 X 10/* C.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |