Patent US3983275A successfully refreshed from Google Patents.
US3983275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cookware prepared from high temperature aluminum base alloys
Assignee: Rio Tinto Switzerland AG
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Filing: 1975-05-02
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Granted: 1976-09-28
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Expires: 1995-05-02
Abstract
Abstract A cooking utensil formed from a high temperature aluminum base alloy component exhibiting favorable formability, said aluminum base alloy component comprising from about 0.1-0.7% zirconium, 0.1-0.4% chromium, 0.3-1.5% manganese, and the balance essentially aluminum and having at least a first and a second major surface, said second major surface being in opposing relationship to said first major surface; a glass or ceramic first covering from about 40 to 100% of the surface area of said first major surface, said glass or ceramic being bonded to said aluminum base alloy component; and a heat resistant organic resin coating over said glass or ceramic component and said first major surface of said aluminum base alloy component.
Inventors
- 👤 Joseph Winter
- 👤 William C. Setzer
- 👤 Douglas L. Graham
- 👤 Michael J. Pryor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:50
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/1321; Y10T428/24; Y10T428/24355; Y10T428/24479; Y10T428/24802; Y10T428/24893; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31623
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
A cooking utensil shaped by a process involving metal deformation from a composite, said composite comprising a high-temperature, substantially magnesium-free aluminum base alloy component exhibiting improved formability, said aluminum base alloy component comprising from about 0.1-0.7% zirconium, 0.1-0.4% chromium, 0.3-1.5% manganese and the balance essentially aluminum and having at least a first and second major surface, said second major surface being in opposing relationship to said first major surface; an oxide layer formed over substantially all of said first major surface, said oxide layer comprised of alumina and having a thickness of at least 50 Angstroms; a glass or ceramic component comprising a coating of a glass or ceramic frit covering from about 40 to 100% of the surface area of said first major surface, said glass or ceramic component being bonded to said aluminum base alloy component in a glass or ceramic-to-metal bond involving said oxide layer; and a heat resistant organic resin coating over said glass or ceramic component and said first major surface of said aluminum base alloy component, said heat resistant organic resin component comprising a cooking surface.
Claim 2
Dependent Claim
182 words
A cooking utensil shaped by a process involving metal deformation from a composite, said composite comprising a high-temperature, substantially magnesium-free aluminum base alloy component exhibiting improved formability, said aluminum base alloy component comprising from about 0.1-0.7% zirconium, 0.1-0.4% chromium, 0.3-1.5% manganese and the balance essentially aluminum and having at least a first and second major surface, said second major surface being in opposing relationship to said first major surface; an oxide layer formed over substantially all of said first major surface, said oxide layer comprised of alumina and having a thickness of at least 50 Angstroms; a glass or ceramic component comprising a coating of a glass or ceramic frit covering from about 40 to 100% of the surface area of said first major surface, said glass or ceramic component being bonded to said aluminum base alloy component in a glass or ceramic-to-metal bond involving said oxide layer; and a heat resistant organic resin coating over said glass or ceramic component and said first major surface of said aluminum base alloy component, said heat resistant organic resin component comprising a cooking surface.
Claim 3
Dependent Claim
35 words
A cooking utensil as in claim 1 wherein said aluminum base alloy component contains up to 0.7% iron, up to 0.5% silicon, up to 0.5% copper, others, each up to 0.1%, total up to 0.25%.
Claim 4
Dependent Claim
29 words
A cooking utensil as in claim 1 wherein said heat resistant organic resin is a polyimide, a polymer of a halogenated ethylene or a halogenated propylene or a silicone.
Claim 5
Dependent Claim
30 words
A cooking utensil as in claim 1 wherein said aluminum base alloy consists essentially of 0.2 to 0.4% zirconium, 0.2 to 0.3% chromium, 0.5 to 1.3% manganese, balance essentially aluminum.
Claim 6
Dependent Claim
15 words
A cooking utensil as in claim 1 wherein said heat resistant organic resin comprises polytetrafluoroethylene.
Claim 7
Dependent Claim
26 words
A cooking utensil as in claim 1 further including a glass or ceramic component bonded to said second major surface of said aluminum base alloy component.
Claim 8
Dependent Claim
42 words
A cooking utensil as in claim 1 wherein formability is defined herein as the distance said alloy is deformed per unit of deforming force exerted thereon, and said alloy exceeds by at least about 40% the formability of comparable aluminum base alloys.
References Cited (Backward Citations)
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US3393086A
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US3386820A
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US3419414A
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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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |