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US4843218A
Expired / Lapsed
US
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Heating element for thermal heating devices, especially cooking stations
Assignee: BSH Hausgeräte GmbH
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Filing: 1988-09-08
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Granted: 1989-06-27
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Expires: 2008-09-08
Abstract
Abstract A heating element for thermal household appliances includes an inherently stable carrier element having a heating surface in close thermal contact with a substance to be heated, and at least one heating resistor in the form of at least one flat heating conductor strip supported by and closely thermally coupled to the carrier element.
Inventors
- 👤 Julius Husslein
- 👤 Gunther Wittauer
- 👤 Heinz Kotsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:30
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/72
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
Heating element for thermal household appliances, comprising a sandwich structure including: a heating element layer formed of insulating material having flat heating conductor strips constructed according to a thick film paste technique embedded in said heating element layer; an inherently stable metal carrier element having a heating surface in close thermal contact with and supporting a substance to be heated and an insulation layer facing said heating element layer above said heat conductor strips; and a reflector layer disposed directly below said heating element layer; said heating element layer, said carrier element and said reflector layer of said sandwich structure being rigidly connected to each other.
Claim 2
Dependent Claim
106 words
Heating element for thermal household appliances, comprising a sandwich structure including: a heating element layer formed of insulating material having flat heating conductor strips constructed according to a thick film paste technique embedded in said heating element layer; an inherently stable metal carrier element having a heating surface in close thermal contact with and supporting a substance to be heated and an insulation layer facing said heating element layer above said heat conductor strips; and a reflector layer disposed directly below said heating element layer; said heating element layer, said carrier element and said reflector layer of said sandwich structure being rigidly connected to each other.
Claim 3
Dependent Claim
43 words
Heating element according to claim 1, wherein said carrier element is a metal plate having two sides, and including enamel coatings disposed on both of said sides of said metal plate, said heat conductor strips being disposed on one of said enamel coatings.
Claim 4
Dependent Claim
45 words
Heating element according to claim 1, wherein said carrier element includes at least one relatively thin steel plate, a relatively thick aluminum layer having a surface, and an insulating layer disposed on said surface onto which said at least one heating conductor strip is applied.
Claim 5
Dependent Claim
31 words
Heating element according to claim 1, including an insulating layer disposed on said heating conductor strips, and a reinforcing aluminum body with a small thermal mass fastened on said insulating layer.
Claim 6
Dependent Claim
31 words
Heating element according to claim 1, including an intermediate layer with good heat conducting properties disposed between said carrier element and said heating conductor strips for compensating for existing uneven surfaces.
Claim 7
Dependent Claim
41 words
Heating element according to claim 1, wherein said carrier element includes intermediate zones with increased heat-flow resistance between said heating conductor strips, and said intermediate zones with increased heat-flow resistance are in the form of narrowed portions of said carrier element.
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |