Patent US3885128A successfully refreshed from Google Patents.
US3885128A
Expired / Lapsed
US
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Glass-ceramic plate heating unit cast-in heat spreader
Assignee: General Electric Co
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Filing: 1974-07-01
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Granted: 1975-05-20
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Expires: 1994-07-01
Abstract
Abstract A glass-ceramic plate surface heating unit has a high thermal conductivity layer such as aluminum or copper cast in a recess formed on the underside of the plate, a metal sheathed electrical resistance heating element with an underlying reinforcing member is cast into the high conductivity layer, so that the said layer serves both as a mechanical and thermal coupling means between the heating element and the plate as well as a heat spreader means across the plate. The underside of the plate is shown with a plurality of cavities so as to increase the area of contact between the high conductivity layer and the glass-ceramic plate.
Inventors
- 👤 Raymond L Dills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:54
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/10; F24C15/102; F24C15/105; H; H05; H05B; H05B3/00; H05B3/68; H05B3/74; H05B3/748
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A surface heating unit comprising a glass-ceramic plate having recess means formed on the underside thereof, the recess means substantially covering a large area of the plate and being substantially filled with a metal casting of high thermal conductivity such as aluminum or copper that is formed in place, a metal sheathed electrical resistance heating element with a reinforcing member of open framework fastened across the underside of the heating element, the heating element and reinforcing member being partially embedded in the said metal casting, whereby the metal casting serves as both a mechanical and thermal coupling means between the heating element and the glass-ceraMic plate as well as the heat spreader means across the plate.
Claim 2
Dependent Claim
116 words
A surface heating unit comprising a glass-ceramic plate having recess means formed on the underside thereof, the recess means substantially covering a large area of the plate and being substantially filled with a metal casting of high thermal conductivity such as aluminum or copper that is formed in place, a metal sheathed electrical resistance heating element with a reinforcing member of open framework fastened across the underside of the heating element, the heating element and reinforcing member being partially embedded in the said metal casting, whereby the metal casting serves as both a mechanical and thermal coupling means between the heating element and the glass-ceraMic plate as well as the heat spreader means across the plate.
Claim 3
Dependent Claim
51 words
A glass-ceramic plate as recited in claim 1 wherein the said recess means on the underside of the glass-ceramic plate is formed with a plurality of cavities that are also filled with the metal casting so as to increase the area of contact between the glass-ceramic plate and the metal casting.
Claim 4
Dependent Claim
90 words
A surface heating unit as recited in claim 1 wherein there is a reflector pan positioned beneath the glass-ceramic plate and having a peripheral edge near the top portion of the pan on which the said reinforcing member is seated, and fastening means joining the reflector pan to the reinforcing member, the area of the glass-ceramic plate in contact with the metal casting being provided with a textured surface having a plurality of cavities for increasing the area of contact between these two parts and hence the thermal coupling action.
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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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |