Patent US4912443A successfully refreshed from Google Patents.
US3567906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planar surface heater with integral fasteners for heating element
Assignee: General Electric Co
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Filing: 1969-04-14
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Granted: 1971-03-02
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Expires: 1989-04-14
Abstract
Abstract A heated cooktop having a top glass-ceramic plate with one or more electrical resistance heating units adjacent the underside thereof to form one or more heated areas of the plate upon which a cooking utensil could be positioned for heating or cooking purposes. A heating unit has a base plate upon which are supported a first lower layer of resilient insulation material, a second layer of semirigid insulating board, and a closely wound, sinuous, electrical resistance heating wire of flattened cross section where the resistance wire is provided on its underside with fastening spikes that are embedded in the top of the insulating board. The top of the resistance wire is in heat transfer relationship with the glass-ceramic plate. The top plate is seated on a supporting surface independently of the heating units. One embodiment incorporates a strip of elastic material under the peripheral edge of the top plate and in contact with the supporting surface to prevent direct contact between the top plate and supporting surface, while sealing the joint therebetween from the accumulation of liquids and soil.
Inventors
- 👤 Bohdan Hurko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:06
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/74; H05B3/748
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
A surface heater comprising a heated panEl of glass-ceramic material, thermal insulating means in strip form for supporting the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a first lower layer of resilient insulating material carried by the bottom plate, a second upper layer of semirigid insulating board carried by the said resilient layer, and an electrical resistance heating element supported on the top surface of the insulating board and having terminal portions for making electrical connection thereto, means for fastening the heating element to the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit from terminal to terminal, the lower layer of resilient insulating material being slightly compressed to bias the heating element into good contact with the underside of the glass-ceramic panel.
Claim 2
Dependent Claim
165 words
A surface heater comprising a heated panEl of glass-ceramic material, thermal insulating means in strip form for supporting the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a first lower layer of resilient insulating material carried by the bottom plate, a second upper layer of semirigid insulating board carried by the said resilient layer, and an electrical resistance heating element supported on the top surface of the insulating board and having terminal portions for making electrical connection thereto, means for fastening the heating element to the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit from terminal to terminal, the lower layer of resilient insulating material being slightly compressed to bias the heating element into good contact with the underside of the glass-ceramic panel.
Claim 3
Dependent Claim
31 words
A surface heater as recited in claim 1 wherein the said fastening means for the heating element includes spikes integral with the underside of the element which penetrate the insulating board.
Claim 4
Dependent Claim
44 words
A surface heater as recited in claim 1 wherein the said connecting means between the ends of adjacent bands of the heating element comprise staples that are permanently attached between adjacent bands of the heating element and have spikes embedded into the insulating board.
Claim 5
Dependent Claim
170 words
A surface heater comprising a heated panel of glass-ceramic material, thermal insulating means in strip form adapted to support the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a layer of semirigid insulating board carried by said bottom plate, an electrical resistance heating element supported on the top surface of the insulating board and having terminal portions for making electrical connections thereto, means for fastening the heating element to the insulating board including spikes integral with the underside of the heating element which penetrate the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit between said terminal portions, and resilient means carried by said bottom supporting plate for biasing the insulating board and its supported heating element upward into good thermal contact with the underside of the glass-ceramic panel.
Claim 6
Dependent Claim
170 words
A surface heater comprising a heated panel of glass-ceramic material, thermal insulating means in strip form adapted to support the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a layer of semirigid insulating board carried by said bottom plate, an electrical resistance heating element supported on the top surface of the insulating board and having terminal portions for making electrical connections thereto, means for fastening the heating element to the insulating board including spikes integral with the underside of the heating element which penetrate the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit between said terminal portions, and resilient means carried by said bottom supporting plate for biasing the insulating board and its supported heating element upward into good thermal contact with the underside of the glass-ceramic panel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |