US3718498A
Expired / Lapsed
US
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Catalytic composition
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-03-29
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Granted: 1973-02-27
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Expires: 1991-03-29
Abstract
Abstract By coating the internal surface of a cooking oven with a catalytic composition comprising porous mutually sintered vitreous enamel particles and finely divided transition metal oxides including copper oxide with the oxides of cobalt or manganese or both, the surfaces are rendered substantially selfcleaning. Preferred compositions are disclosed for situations in which (a) build-up of deposits is to be minimized, or (b) rapid removal of deposited fat is required.
Inventors
- 👤 P Denny
- 👤 D Dowden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:30
CPC Classifications
C; C03; C03C; C03C4/00; C23; C23D; C23D5/00; F; F24; F24C; F24C15/00; F24C15/005; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/24997
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
An oven according to claim 1 in which the oxides have an average particle size up to 10 microns.
Claim 2
Dependent Claim
22 words
An oven according to claim 1 in which the copper oxide constitutes at least 15 percent of the oxides by metal atoms.
Claim 3
Dependent Claim
75 words
A cooking oven especially adapted to avoid build-up of fat decomposition products, said oven having an internal surface coating comprising mutually sintered vitreous enamel particles and finely divided transition metal oxides including copper oxide in admixture with the oxide of cobalt or manganese or both, said oxide mixture containing at least 5 percent of cobalt oxide or of manganese oxide and lying within an area bounded by line A on the accompanying triangular phase diagram.
Claim 4
Dependent Claim
25 words
An oven according to claim 4 in which the oxide mixture lies within an area bounded by line B on the accompanying triangular phase diagram.
Claim 5
Dependent Claim
64 words
A cooking oven especially adapted for quick removal of fat and its decomposition products, said oven having an internal surface coating comprising mutually sintered vitreous enamel particles and finely divided transition metal oxides including copper oxide in admixture with the oxide of cobalt or manganese or both, said oxide mixture lying in the area bounded by line C on the accompanying triangular phase diagram.
Claim 6
Dependent Claim
21 words
An oven according to claim 1 in which the coating has a porosity in the range 5 to 50 volume percent.
Claim 7
Dependent Claim
19 words
An oven according to claim 1 in which the coating contains 10-35 percent by weight of transition metal oxides.
Claim 8
Dependent Claim
20 words
An oven according to claim 1 in which the transition metal oxides of the coating have been prepared by co-precipitation.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |