Patent US3632983A successfully refreshed from Google Patents.
US3632983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smooth surfaced, heated cooktop
Assignee: General Electric Co
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Filing: 1970-10-13
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Granted: 1972-01-04
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Expires: 1990-10-13
Abstract
Abstract A heated cooktop formed of four individual glass-ceramic plates supported in a plane across the open top of a mounting box. This box is adapted to be suspended in an opening formed in a kitchen counter to provide a flush, cooking surface, there being multiple remote control switches adapted to be mounted on the kitchen wall or on the front of the cabinet which supports the counter. Each plate is furnished with a metal-sheathed resistance heating element bearing against the underside thereof. A high emissivity, ceramic coating is interposed between the metal sheath and the underside of the glass-ceramic plate. A lower layer of thermal insulation supports the heating element up against the plate. Narrow trim strips overlie the peripheral edge of each plate to fasten the plates down. Resilient pads are located adjacent each corner of each plate to help support the plates. Certain of the trim strips are removable so that the cooktop is topserviceable.
Inventors
- 👤 Raymond L Dills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:16
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/10; F24C15/108; H; H05; H05B; H05B3/00; H05B3/68; H05B3/74; H05B3/748
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
124 words
A heated cooktop comprising a plurality of individual plates of high resistivity, dielectric material such as crystalline glass, a shallow mounting box adapted to have the plates supported across the top open surface of the box, an inner filler plate fitted into the box and including for each plate a well, each well supporting a layer of thermal insulation, a metalsheathed electrical resistance heating element supported on the insulation, and one of said crystalline glass plates being supported on each heating element, and a trim strip surrounding the top edge of the mounting box and overlying the adjacent edges of the plates, and trim means overlying the mounting box and disposed between adjacent plates for holding down the remaining edges of the glass plates.
Claim 2
Dependent Claim
124 words
A heated cooktop comprising a plurality of individual plates of high resistivity, dielectric material such as crystalline glass, a shallow mounting box adapted to have the plates supported across the top open surface of the box, an inner filler plate fitted into the box and including for each plate a well, each well supporting a layer of thermal insulation, a metalsheathed electrical resistance heating element supported on the insulation, and one of said crystalline glass plates being supported on each heating element, and a trim strip surrounding the top edge of the mounting box and overlying the adjacent edges of the plates, and trim means overlying the mounting box and disposed between adjacent plates for holding down the remaining edges of the glass plates.
Claim 3
Dependent Claim
45 words
A heated cooktop as recited in claim 1 with resilient means for urging each heating element into engagement with the underside of the related glass plate, and resilient support means adjacent each corner of each plate for supporting the glass plate near the extremities thereof.
Claim 4
Dependent Claim
88 words
A crystalline glass cooktop comprising a mounting box, and supporting a plurality of glass plate heating units where each heating unit comprises a layer of thermal insulation, a metal-sheathed resistance heating element supported on the insulation, and a crystalline glass plate supported on the heating element, a trim strip surrounding the top edge of the mounting box and overlying the adjacent edges of the said plate heating units, and removable trim strips disposed between adjacent glass plates, and fastening means for holding the removable trim strips in place.
Claim 5
Dependent Claim
88 words
A crystalline glass cooktop comprising a mounting box, and supporting a plurality of glass plate heating units where each heating unit comprises a layer of thermal insulation, a metal-sheathed resistance heating element supported on the insulation, and a crystalline glass plate supported on the heating element, a trim strip surrounding the top edge of the mounting box and overlying the adjacent edges of the said plate heating units, and removable trim strips disposed between adjacent glass plates, and fastening means for holding the removable trim strips in place.
Claim 6
Dependent Claim
85 words
A glass-ceramic cooktop including a mounting box, a plurality of glass plate surface heating units supported in the box, each surface unit comprising a layer of thermal insulation, a metal-sheathed resistance heating element supported on the insulation, and a glass-ceramic plate supported on the heating element, a trim strip surrounding the top edge of the mounting box and overlying the adjacent edge of the glass plates, removable trim strips disposed between adjacent glass plates, and fastening means for holding the removable trim strips in place.
Claim 7
Dependent Claim
85 words
A glass-ceramic cooktop including a mounting box, a plurality of glass plate surface heating units supported in the box, each surface unit comprising a layer of thermal insulation, a metal-sheathed resistance heating element supported on the insulation, and a glass-ceramic plate supported on the heating element, a trim strip surrounding the top edge of the mounting box and overlying the adjacent edge of the glass plates, removable trim strips disposed between adjacent glass plates, and fastening means for holding the removable trim strips in place.
Claim 8
Dependent Claim
101 words
A heated crystalline glass cooktop comprising four plates of glass and a shallow mounting box where the glass plates are adapted to be supported across the top open surface of the box, each glass plate resting on a metal-sheathed resistance heating element, and resilient means for urging each heating element into engagement with the underside of the related glass plate, trim means surrounding the peripheral edge of the box and overlying the adjacent edges of the glass plates, and removable trim strips positioned between adjacent edges of the glass plate, and fastening means for holding the removable trim strips in place.
Claim 9
Dependent Claim
101 words
A heated crystalline glass cooktop comprising four plates of glass and a shallow mounting box where the glass plates are adapted to be supported across the top open surface of the box, each glass plate resting on a metal-sheathed resistance heating element, and resilient means for urging each heating element into engagement with the underside of the related glass plate, trim means surrounding the peripheral edge of the box and overlying the adjacent edges of the glass plates, and removable trim strips positioned between adjacent edges of the glass plate, and fastening means for holding the removable trim strips in place.
Claim 10
Dependent Claim
53 words
A heated crystalline glass cooktop as recited in claim 5 with an inner filler plate supported in the mounting box, said filler plate including restraining means to prevent side movement of the heating elements, and resilient means adjacent the corners of each glass plate to seal the glass plates against the trim strips.
Claim 11
Dependent Claim
48 words
A heated crystalline glass cooktop as recited in claim 5 wherein at least the top surface of each heating element is spaced from the glass plate by a high emissivity ceramic coating to protect the crystalline glass from the oxidation of the metal sheath of the heating element.
Claim 12
Dependent Claim
118 words
A glass-ceramic cooktop having a plurality of surface heating units, where each unit comprises a metal-sheathed resistance heating element and a glass-ceramic plate seated on the heating element, and resilient means for urging the heating element into contact with the underside of the glass-ceramic plate, wherein the top surface of the heating element is spaced from the glass-ceramic plate by a high emissivity ceramic coating to protect the glass-ceramic plate from the oxidation of the metal sheath of the heating elements by reducing the maximum temperature of the sheath as compared with standard metal-sheathed heating elements of similar wattage, as well as providing faster heat-up and cool-down rates, and making the heating unit electrically safe from current leakage.
Claim 13
Dependent Claim
118 words
A glass-ceramic cooktop having a plurality of surface heating units, where each unit comprises a metal-sheathed resistance heating element and a glass-ceramic plate seated on the heating element, and resilient means for urging the heating element into contact with the underside of the glass-ceramic plate, wherein the top surface of the heating element is spaced from the glass-ceramic plate by a high emissivity ceramic coating to protect the glass-ceramic plate from the oxidation of the metal sheath of the heating elements by reducing the maximum temperature of the sheath as compared with standard metal-sheathed heating elements of similar wattage, as well as providing faster heat-up and cool-down rates, and making the heating unit electrically safe from current leakage.
Claim 14
Dependent Claim
109 words
A glass-ceramic cooktop as recited in claim 8 wherein there are four surface heating units with rectangular glass-ceramic plates of substantially equal size, a mounting box for supporting the heating units therein in a rectangular formation, said resilient means being a layer of thermal insulation, and second resilient means positioned adjacent each corner of each glass-ceramic plate to bear upwardly against the said plate, a trim strip surrounding the peripheral edge of the box and extending inwardly thereof to overlie the adjacent edges of the glass-ceramic plate, and removable trim strips positioned between abutting edges of the glass-ceramic plate, and fastening means for holding the trim strips in place.
Claim 15
Dependent Claim
119 words
A heated cooktop comprising a plurality of individual plates of high resistivity, dielectric material such as crystalline glass, a shallow mounting box adapted to have the plates supported across the top open surface of the box, the box having a well furnished for each plate, each well supporting a layer of thermal insulation, a metal-sheathed electrical resistance heating element supported on the insulation, and one of said crystalline glass plates being supported on each heating element, and a trim strip surrounding the top edge of the mounting box and overlying the adjacent edges of the plates, and trim means supported from the mounting box and disposed between adjacent plates for holding down the remaining edges of the glass plates.
Claim 16
Dependent Claim
119 words
A heated cooktop comprising a plurality of individual plates of high resistivity, dielectric material such as crystalline glass, a shallow mounting box adapted to have the plates supported across the top open surface of the box, the box having a well furnished for each plate, each well supporting a layer of thermal insulation, a metal-sheathed electrical resistance heating element supported on the insulation, and one of said crystalline glass plates being supported on each heating element, and a trim strip surrounding the top edge of the mounting box and overlying the adjacent edges of the plates, and trim means supported from the mounting box and disposed between adjacent plates for holding down the remaining edges of the glass plates.
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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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |