Patent US4614852A successfully refreshed from Google Patents.
US4614852A
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Electromagnetic induction heating cooking utensil
Assignee: Nippon Light Metal Co Ltd
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Filing: 1985-07-30
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Granted: 1986-09-30
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Expires: 2005-07-30
Abstract
Abstract A cooking utensil for heating by electromagnetic induction comprises an aluminum or aluminum alloy vessel having at its bottom a spray coated layer of iron and a spray coated layer of aluminum or an aluminum alloy covering the iron layer.
Inventors
- 👤 Kenyo Matsushita
- 👤 Hiroshi Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:40
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/12; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A cooking utensil for heating by electromagnetic induction comprising a vessel made of a material selected from the group consisting of aluminum and an aluminum alloy, said vessel having at its bottom a spray coated layer of a magnetic material having a thickness of about 0.4-0.7 mm and a spray coated layer of a material selected from the group consisting of aluminum and an aluminum alloy covering said layer of a magnetic material and having a thickness from about 0.1 up to not more than 1.0 mm.
Claim 2
Dependent Claim
87 words
A cooking utensil for heating by electromagnetic induction comprising a vessel made of a material selected from the group consisting of aluminum and an aluminum alloy, said vessel having at its bottom a spray coated layer of a magnetic material having a thickness of about 0.4-0.7 mm and a spray coated layer of a material selected from the group consisting of aluminum and an aluminum alloy covering said layer of a magnetic material and having a thickness from about 0.1 up to not more than 1.0 mm.
Claim 3
Dependent Claim
37 words
A cooking utensil as set forth in claim 1, wherein said layer of a magnetic material has a thickness of 0.37 to 0.71 mm and said layer covering it has a thickness of 0.062 to 0.20 mm.
Claim 4
Dependent Claim
15 words
A cooking utensil as set forth in claim 1, wherein said magnetic material is iron.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |