Patent US1481578A successfully refreshed from Google Patents.
US5221829A
Expired / Lapsed
US
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Domestic cooking apparatus
Assignee: Lancet SA
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Filing: 1991-02-08
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Granted: 1993-06-22
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Expires: 2011-02-08
Abstract
Abstract Domestic cooking apparatus including a layer of ceramic material having high temperature thermal shock resistance and defining a first surface which is a planar cooking surface and a second surface and a foil heating element disposed in intimate touching heat transfer engagement with the second surface of the layer of material having high temperature thermal shock resistance.
Inventors
- 👤 Shimon Yahav
- 👤 Yair Daar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:50
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/08; H; H05; H05B; H05B3/00; H05B3/68; H05B3/74; H05B3/748; H05B2213/00; H05B2213/04; H05B2213/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
Domestic cooking apparatus comprising: a layer of ceramic material having high temperature thermal shock resistance and defining a first surface which is a planar cooking surface and a second surface; a foil heating element disposed in intimate touching heat transfer engagement with said second surface of said layer of material having high temperature thermal shock resistance, wherein said foil heating element is operative to heat at least a portion of said ceramic material having high temperature thermal shock resistance to a temperature exceeding 200 degrees centigrade; a layer of metal located adjacent a side of the foil heating element opposite from that facing the planar cooking surface; a layer of an electrical insulator disposed between said layer of metal and said foil heating element; and a layer of a thermal insulator disposed adjacent a side of said layer of metal, opposite from that facing the foil heating element.
Claim 2
Dependent Claim
148 words
Domestic cooking apparatus comprising: a layer of ceramic material having high temperature thermal shock resistance and defining a first surface which is a planar cooking surface and a second surface; a foil heating element disposed in intimate touching heat transfer engagement with said second surface of said layer of material having high temperature thermal shock resistance, wherein said foil heating element is operative to heat at least a portion of said ceramic material having high temperature thermal shock resistance to a temperature exceeding 200 degrees centigrade; a layer of metal located adjacent a side of the foil heating element opposite from that facing the planar cooking surface; a layer of an electrical insulator disposed between said layer of metal and said foil heating element; and a layer of a thermal insulator disposed adjacent a side of said layer of metal, opposite from that facing the foil heating element.
Claim 3
Dependent Claim
37 words
Domestic cooking apparatus according to claim 1 and wherein said foil heating element is operative to heat at least a portion of said material having high temperature thermal shock resistance to a temperature exceeding 270 degrees centigrade.
Claim 4
Dependent Claim
44 words
Apparatus according to claim 2 and also comprising means for sensing the temperature of said foil heating element by measuring the electrical resistance thereof and means for governing the electrical power supplied to said foil heating element in accordance with the sensed temperature thereof.
Claim 5
Dependent Claim
59 words
Domestic cooking apparatus according to claim 3 and wherein said foil heating element provides heating of a density of at least 20 Watt per square inch of the area of said second surface subtended by the shortest closed planar convex curve circumscribing the projection thereon of the foil heating element of a cooking location excluding the electrical leads thereto.
Claim 6
Dependent Claim
37 words
Domestic cooking apparatus according to claim 2 and wherein said foil heating element is operative to heat at least a portion of said material having high temperature thermal shock resistance to a temperature exceeding 350 degrees centigrade.
Claim 7
Dependent Claim
43 words
Domestic cooking apparatus according to claim 5 and wherein said foil heating element provides heating of a density of at least 20 Watt per square inch of the area of said second surface generally overlying the overall region of said foil heating element.
Claim 8
Dependent Claim
24 words
Domestic cooking apparatus according to claim 6 and also comprising at least one heat reflecting layer disposed under said layer of a thermal insulation.
Claim 9
Dependent Claim
44 words
Domestic cooking apparatus according to claim 1 and also comprising means for urging said layer of a thermal insulator, said foil heating element and said material having high temperature thermal shock resistance as well as any intervening layers associated therewith together in intimate engagement.
References Cited (Backward Citations)
US3805023A
Cited
US3885128A
Cited
US3974360A
Cited
US4150280A
Cited
US4524264A
Cited
US4507546A
Cited
US4843218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-21 | 1996-12-21 | 1997-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-21 | 2000-12-21 | 2001-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-21 | 2004-12-21 | 2005-06-22 | $7700.00 | Window Closed / Lapsed |