US3826898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Border treatment of composite metal plate surface heating unit
Assignee: General Electric Co
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Filing: 1973-11-28
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Granted: 1974-07-30
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Expires: 1993-11-28
Abstract
Abstract A low thermal mass, solid plate surface heating unit having a top utensil-supporting surface of composite metal of high thermal conductivity and corrosion and oxidation resisting materials. A metal sheathed electrical resistance heating element is pressed against the underside of the composite plate by a back-up plate. There are two modifications of the manner of spacing the peripheral edge of the inner core of the composite metal plate back from the peripheral edge of the heating unit. In one modification, a margin of the inner core and the bottom skin are cut away so as to be set back from the peripheral edge of the top skin. In the second modification, the top and bottom skins of the composite plate are sealed over the edge of the inner core. Then the peripheral edge of the back-up plate is brought out beyond the peripheral edge of the composite plate and a trim strip is wrapped around the edge of the back-up plate and the edge of the top skin and sealed therebetween.
Inventors
- 👤 B Hurko
- 👤 R Dills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:48
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/10; F24C15/102; H; H05; H05B; H05B3/00; H05B3/68; H05B3/72
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
161 words
A low thermal mass, solid plate surface heating unit comprising a thin composite metal plate having a core of high thermal conductivity selected from the group comprising copper, silver, and aluminum, and an outer skin of rigid and oxidation and corrosion resisting material sealing the core and selected from the group comprising stainless steel, nickel, and chromium, a metal sheathed electrical resistance heating element held against the underside of the composite plate to serve as the heat source for the composite plate, a metal back-up plate beneath the heating element for holding the heating element against the composite plate, the periphery of the back-up plate extending outwardly beyond the extremity of the core of the composite plate by a wide margin so as to reduce the conduction of heat from the heating unit to its supporting surface, and a metal trim strip wrapped around the edge of the back-up plate and the top skin of the composite plate and sealed thereBetween.
Claim 2
Dependent Claim
161 words
A low thermal mass, solid plate surface heating unit comprising a thin composite metal plate having a core of high thermal conductivity selected from the group comprising copper, silver, and aluminum, and an outer skin of rigid and oxidation and corrosion resisting material sealing the core and selected from the group comprising stainless steel, nickel, and chromium, a metal sheathed electrical resistance heating element held against the underside of the composite plate to serve as the heat source for the composite plate, a metal back-up plate beneath the heating element for holding the heating element against the composite plate, the periphery of the back-up plate extending outwardly beyond the extremity of the core of the composite plate by a wide margin so as to reduce the conduction of heat from the heating unit to its supporting surface, and a metal trim strip wrapped around the edge of the back-up plate and the top skin of the composite plate and sealed thereBetween.
Claim 3
Dependent Claim
156 words
A low thermal mass, solid plate surface heating unit comprising a thin composite metal plate having a core of high thermal conductivity selected from the group comprising copper, silver, and aluminum, and an outer skin of rigid and oxidation and corrosion resisting material sealing the core and selected from the group comprising stainless steel, nickel, and chromium, a metal sheathed electrical resistance heating element held against the underside of the composite plate to serve as the heat source for the composite plate, a metal back-up plate beneath the heating element for holding the heating element against the composite plate, the periphery of the back-up plate extending out beyond the extremity of the composite plate by a wide margin so as to reduce the conduction of heat from the heating unit to its supporting surface, and a metal trim strip bridging the edge of the back-up plate and the edge of the composite plate and sealed thereto.
Claim 4
Dependent Claim
156 words
A low thermal mass, solid plate surface heating unit comprising a thin composite metal plate having a core of high thermal conductivity selected from the group comprising copper, silver, and aluminum, and an outer skin of rigid and oxidation and corrosion resisting material sealing the core and selected from the group comprising stainless steel, nickel, and chromium, a metal sheathed electrical resistance heating element held against the underside of the composite plate to serve as the heat source for the composite plate, a metal back-up plate beneath the heating element for holding the heating element against the composite plate, the periphery of the back-up plate extending out beyond the extremity of the composite plate by a wide margin so as to reduce the conduction of heat from the heating unit to its supporting surface, and a metal trim strip bridging the edge of the back-up plate and the edge of the composite plate and sealed thereto.
Claim 5
Dependent Claim
99 words
A composite metal plate surface heating unit as recited in claim 2 with the addition of a reflector pan assembled beneath the back-up plate, the peripheral edge of the reflector pan being provided with an insulating gasket means which is sandwiched between the reflector pan and back-up plate and serves as a heat transfer barrier therebetween said gasket means also being adapted to serve as the support means of the heating unit on a support surface and thereby adapted to serve as a sealing means therebetween and to prevent direct contact of the composite plate with the support surface.
Claim 6
Dependent Claim
195 words
A composite metal plate surface heating unit having a thin multilayer composite metal sheet as its top utensil-supporting surface, said composite sheet having an inner heat spreading core of non-ferrous metallic alloy of high thermal conductivity, the core being sealed in an outer metallic alloy skin of higher strength and resistance to oxidation than the inner core, a metal sheathed electrical resistance heating element pressed against the underside of the composite sheet to serve as the heat source for the heating unit, a metal back-up plate beneath the heating element for holding the heating element in place, the periphery of the back-up plate extending outwardly beyond the extremity of the inner core by a wide margin so as to reduce the conduction of heat from the heating unit to its supporting surface, and a metal trim encircling the heating unit and sealed between the edge of the top skin of the composite sheet and to the edge of the back-up plate so as to stop the heat spreading core short of the periphery of the heating unit and reduce the conduction of heat from the inner core to the peripheral extremity of the heating unit.
Claim 7
Dependent Claim
195 words
A composite metal plate surface heating unit having a thin multilayer composite metal sheet as its top utensil-supporting surface, said composite sheet having an inner heat spreading core of non-ferrous metallic alloy of high thermal conductivity, the core being sealed in an outer metallic alloy skin of higher strength and resistance to oxidation than the inner core, a metal sheathed electrical resistance heating element pressed against the underside of the composite sheet to serve as the heat source for the heating unit, a metal back-up plate beneath the heating element for holding the heating element in place, the periphery of the back-up plate extending outwardly beyond the extremity of the inner core by a wide margin so as to reduce the conduction of heat from the heating unit to its supporting surface, and a metal trim encircling the heating unit and sealed between the edge of the top skin of the composite sheet and to the edge of the back-up plate so as to stop the heat spreading core short of the periphery of the heating unit and reduce the conduction of heat from the inner core to the peripheral extremity of the heating unit.
Claim 8
Dependent Claim
47 words
A composite metal plate surface heating unit as recited in claim 4 wherein the extent of the bottom skin of the composite sheet substantially coincides with the extent of the inner core, and the diameter of the top skin substantially equals the diameter of the back-up plate.
Claim 9
Dependent Claim
99 words
A composite metal plate surface heating unit as recited in claim 5 with the addition of a reflector pan assembled beneath the back-up plate, the peripheral edge of the reflector pan being provided with an insulating gasket means which is sandwiched between the reflector pan and back-up plate and serves as a heat transfer barrier therebetween said gasket means also being adapted to serve as the support means of the heating unit on a support surface and thereby adapted to serve as a sealing means therebetween and to prevent direct contact of the composite plate with the support surface.
Claim 10
Dependent Claim
51 words
A composite metal plate surface heating unit as recited in claim 4 wherein a narrow annular margin of both the bottom skin and the inner core has been removed from the top skin so that the periphery of the inner core is set back from the periphery of the heating unit.
Claim 11
Dependent Claim
66 words
A composite metal plate surface heating unit as recited in claim 4 wherein the periphery of the composite sheet is pressed into a tapered bevelled eDge, a narrow strip of the periphery of the back-up plate is formed to lie in substantially the same plane as the bevelled edge of the composite sheet, whereby the said trim strip serves as an extension of the composite sheet.
Claim 12
Dependent Claim
99 words
A composite metal plate surface heating unit as recited in claim 8 with the addition of a reflector pan assembled beneath the back-up plate, the peripheral edge of the reflector pan being provided with an insulating gasket means which is sandwiched between the reflector pan and back-up plate and serves as a heat transfer barrier therebetween said gasket means also being adapted to serve as the support means of the heating unit on a support surface and thereby adapted to serve as a sealing means therebetween and to prevent direct contact of the composite plate with the support surface.
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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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |