US3566855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning cooking apparatus
Assignee: Fedders Corp
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Filing: 1969-10-21
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Granted: 1971-03-02
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Expires: 1989-10-21
Abstract
Abstract A self-cleaning, abrasion-resistant surface for a cooking apparatus comprising a three-layer coating on a metal surface, each of the first two layers comprising a mixture of a ceramic and a catalytically active material, with, preferably, increased amounts of catalyst in the second coating layer, and an interrupted layer of ceramic above the two-layer coating. Improved bond between the three-layer coating and the base structure of the cooking apparatus can be achieved through the use of a sandwiched ceramic layer.
Inventors
- 👤 Curtis L Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:21
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/005; A; A47; A47J; A47J36/00; A47J36/02; C; C23; C23D; C23D5/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
32 words
The cooking apparatus of claim 1 wherein said walls are formed of a metal selected from the class consisting of iron, iron alloys and steel, chromium-nickel alloys, aluminum, and alloys of aluminum.
Claim 2
Dependent Claim
40 words
The cooking apparatus of claim 1 wherein said catalyst comprises at least one material selected from the class consisting of the oxides, cerates, manganates, manganites, chromates, chromites, and vanadates, of cobalt, nickel, ruthenium, palladium, platinum, and the rare earth metals.
Claim 3
Dependent Claim
14 words
The cooking apparatus of claim 3 wherein said catalyst consists essentially of cerium oxide.
Claim 4
Dependent Claim
31 words
The cooking apparatus of claim 1 wherein said first layer comprises from 42 to 62 percent ceramic, from 34 to 54 percent catalyst, and from 0 to 15 percent coloring oxides.
Claim 5
Dependent Claim
32 words
The cooking apparatus of claim 5 wherein said coloring oxides are selected from the class consisting of cobalt oxide, manganese oxide, iron oxide, chromium oxide, zinc oxide, titanium dioxide and nickel oxide.
Claim 6
Dependent Claim
31 words
The cooking apparatus of claim 1 wherein said second layer comprises from 22 to 40 percent ceramic, from 50 to 65 percent catalyst, and from 0 to 15 percent coloring oxides.
Claim 7
Dependent Claim
32 words
The cooking apparatus of claim 7 wherein said coloring oxides are selected from the class consisting of cobalt oxide, manganese oxide, iron oxide, chromium oxide, zinc oxide, titanium dioxide and nickel oxide.
Claim 8
Dependent Claim
32 words
The cooking apparatus of claim 1 wherein a ceramic ground coat having up to 30 percent calcined alumina is bonded to at least said floor, prior to application of said first layer.
Claim 9
Dependent Claim
142 words
In a cooking apparatus having means for heating a cooking area, means for supporting food to be cooked, wallS at least partially enclosing the cooking area, a floor in said cooking area and a door having an inside wall, the improvement which comprises a coating, at least on the inner wall of said door, said coating comprising: a. a first layer consisting essentially of a mixture of a ceramic and an oxidative catalyst, effective at 275* F. for oxidizing food spills, said surface having a rough, toothed finish; b. a second layer of ceramic and oxidative catalyst bonded to said first layer; and c. an abrasion-resistant coating on said second layer, said coating covering only intermittent portions of said second layer; whereby said oxidative catalyst is effective for the oxidation of food spills and said surface is not removed by normal abrasion.
Claim 10
Dependent Claim
32 words
The cooking apparatus of claim 10 wherein said walls are formed of a metal selected from the class consisting of iron, iron alloys and steel, chromium-nickel alloys, aluminum, and alloys of aluminum.
Claim 11
Dependent Claim
40 words
The cooking apparatus of claim 10 wherein said catalyst comprises at least one material selected from the class consisting of the oxides, cerates, mangagates, manganites, chromates, chromites, and vanadates, of cobalt, nickel, ruthenium, palladium, platinum, and the rare earth metals.
Claim 12
Dependent Claim
14 words
The cooking apparatus of claim 12 wherein said catalyst consists essentially of cerium oxide.
Claim 13
Dependent Claim
31 words
The cooking apparatus of claim 10 wherein said first layer comprises from 42 to 62 percent ceramic, from 34 to 54 percent catalyst, and from 0 to 15 percent coloring oxides.
Claim 14
Dependent Claim
32 words
The cooking apparatus of claim 14 wherein said coloring oxides are selected from the class consisting of cobalt oxide, manganese oxide, iron oxide, chromium oxide, zinc oxide, titanium dioxide, and nickel oxide.
Claim 15
Dependent Claim
31 words
The cooking apparatus of claim 10 wherein said second layer comprises from 22 to 40 percent ceramic, from 50 to 65 percent catalyst, and from 0 to 15 percent coloring oxides.
Claim 16
Dependent Claim
32 words
The cooking apparatus of claim 16 wherein said coloring oxides are selected from the class consisting of cobalt oxide, manganese oxide, iron oxide, chromium oxide, zinc oxide, titanium dioxide and nickel oxide.
Claim 17
Dependent Claim
36 words
The cooking apparatus of claim 10 wherein a ceramic ground coat having up to 30 percent calcined alumina is bonded to at least the inner wall of said door, prior to application of said first layer.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |