US3909592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stove top assembly
Assignee: Polaris Fabrikker AS
•
Filing: 1975-01-02
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Granted: 1975-09-30
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Expires: 1995-01-02
Abstract
Abstract The invention relates to a stove top assembly wherein the stove includes a thin sheet of ductile material such as stainless steel having low heat conductivity characteristics. Individual heating units beneath the top sheet are in spaced relation to each other with each heating unit including a center layer of good conducting material such as aluminum or copper in abutting contact with the upper sheet of material. Each heating unit has a lower layer or sheet of ductile material in abutting engagement with the center layer of material. Electrical heating elements are associated with each of the heating units. The upper sheet of ductile material acts as a bridge between each heated and unheated area and operates in hinge-like fashion to compensate for horizontally directed thermal expansion of the heated area.
Inventors
- 👤 Svein Eide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:01
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; F; F24; F24C; F24C15/00; F24C15/10; F24C15/102
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A stove top assembly or the like comprising a thin layer of ductile metallic material, at least one heating unit beneath said ductile layer attached thereto, said heating unit including a first heat distributing layer of metallic material in contact with said layer of ductile material, a second heat distributing layer of metallic material in surrounding and spaced relation to said first layer and being in contact with said layer of ductile material, said layer of ductile material forming a bridge between said first and second layers, said bridge having a hinging action to accommodate thermal expansion, said layer of ductile material having a heat conductivity factor less than 50 K cal/m.h.*C and a thickness of 0.1 mm to 0.8mm, said heating unit including electric heating means for heating said heat distributing layer and heat insulating means beneath said heating unit.
Claim 2
Dependent Claim
141 words
A stove top assembly or the like comprising a thin layer of ductile metallic material, at least one heating unit beneath said ductile layer attached thereto, said heating unit including a first heat distributing layer of metallic material in contact with said layer of ductile material, a second heat distributing layer of metallic material in surrounding and spaced relation to said first layer and being in contact with said layer of ductile material, said layer of ductile material forming a bridge between said first and second layers, said bridge having a hinging action to accommodate thermal expansion, said layer of ductile material having a heat conductivity factor less than 50 K cal/m.h.*C and a thickness of 0.1 mm to 0.8mm, said heating unit including electric heating means for heating said heat distributing layer and heat insulating means beneath said heating unit.
Claim 3
Dependent Claim
26 words
A stove top assembly according to claim 1 wherein said layer of ductile material is stainless steel and has a thickness of 0.2 to 0.5 mm.
Claim 4
Dependent Claim
27 words
A stove top assembly according to claim 1 wherein said first and second layer of heat distributing material material are integral with said layer of ductile material.
Claim 5
Dependent Claim
41 words
A stove top assembly according to claim 1 wherein said first heat distributing layer of material is separate from said sheet of ductile material and has good heat conductivity, said heat distributing layer having a thickness of 0.5 to 10 mm.
Claim 6
Dependent Claim
34 words
A stove top assembly according to claim 1 including a plurality of said heating units, each said first heat distributing layer being aluminum and having a heat conductivity factor of about 190 K cal/m.h.*C.
Claim 7
Dependent Claim
28 words
A stove top assembly according to claim 1 wherein said first heating unit includes a lower sheet of ductile material bonded to said heat distributing layer of material.
Claim 8
Dependent Claim
27 words
A stove top assembly according to claim 6 wherein said first heat distributing layer of material is aluminum and has a thickness between 0.5 and 10 mm.
Claim 9
Dependent Claim
25 words
A stove top assembly according to claim 1 wherein said first heat distributing layer has a circular shape and said bridge has an annular shape.
Claim 10
Dependent Claim
45 words
A stove top assembly according to claim 8 wherein said layer of ductile material is stainless steel, said first and second heat distributing layers of material being aluminum, said bridge being in overlapping relation to an annularly shaped portion of said second layer of material.
Claim 11
Dependent Claim
37 words
A stove top assembly according to claim 8 wherein said first heat distributing layer comprises a disk shaped portion and a surrounding annularly shaped portion having a higher coefficient of thermal expansion than said disk shaped portion.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |