Patent US3993597A successfully refreshed from Google Patents.
US3993597A
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US
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Catalytic coating composition for cooking devices
Assignee: EIDP Inc
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Filing: 1975-02-26
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Granted: 1976-11-23
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Expires: 1995-02-26
Abstract
Abstract A catalyst composition for coating surfaces of cooking devices exposed to cooking residues is disclosed. The composition contains (1) from about 10-94% by weight of a catalytic metal oxide selected from the group consisting of the oxides of cobalt, chromium, iron, nickel, manganese, copper, zinc, the rare earths, and mixtures thereof in the form of particles having a size of less than 35 microns and said oxide having a surface area of about 5-150 square meters per gram, with the proviso that when the oxide is manganese oxide from 0-80% by weight of said oxide can have a surface area in excess of about 150 square meters per gram; (2) at least 1% by weight on a dry basis of an alkaline silicate, said alkaline silicate being in the form of an aqueous solution; and (3) from about 0-20% by weight of a carbonate or hydroxide of one or more metals of said catalytic metal oxides when the catalytic metal oxide of (1) is manganese oxide and from about 1-20% by weight of the carbonate or hydroxide when the catalytic metal oxide of (1) is other than manganese oxide. Surfaces coated with the disclosed composition effect rapid decomposition and oxidation of cooking residues at temperatures of about 204° C. (400° F.) and lower.
Inventors
- 👤 Alvin Barber Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:09
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/005; B; B01; B01J; B01J23/00; B01J23/16; B01J23/32; B01J23/34; B01J37/00; B01J37/0009
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
213 words
A catalyst composition for coating the surfaces of cooking devices exposed to cooking residues, said composition containing 1. from about 10-94% by weight of a catalytic metal oxide selected from the group consisting of the oxides of cobalt, chromium, iron, nickel, manganese, copper, zinc, the rare earths and mixtures thereof in the form of particles having a size of less than 35 microns and a surface area of about 5-150 square meters per gram with the proviso that when the oxide is manganese oxide, from 0-80% by weight of said oxide can have a surface area in excess of about 150 square meters per gram; 2. at least 1% by weight on a dry basis of an alkaline silicate selected from the group consisting of sodium silicate, lithium silicate, potassium silicate, silicates of organic bases having a basic dissociation constant greater than 10.sup. -3 and mixtures thereof, said alkaline silicate being in the form of an aqueous solution; and 3. from about 0-20% by weight of a carbonate or hydroxide of one or more metals of said catalytic metal oxides when the catalytic metal oxide of (1) is manganese oxide and from about 1-20% by weight of said carbonate or hydroxide when the catalytic metal oxide of (1) is other than manganese oxide.
Claim 2
Dependent Claim
213 words
A catalyst composition for coating the surfaces of cooking devices exposed to cooking residues, said composition containing 1. from about 10-94% by weight of a catalytic metal oxide selected from the group consisting of the oxides of cobalt, chromium, iron, nickel, manganese, copper, zinc, the rare earths and mixtures thereof in the form of particles having a size of less than 35 microns and a surface area of about 5-150 square meters per gram with the proviso that when the oxide is manganese oxide, from 0-80% by weight of said oxide can have a surface area in excess of about 150 square meters per gram; 2. at least 1% by weight on a dry basis of an alkaline silicate selected from the group consisting of sodium silicate, lithium silicate, potassium silicate, silicates of organic bases having a basic dissociation constant greater than 10.sup. -3 and mixtures thereof, said alkaline silicate being in the form of an aqueous solution; and 3. from about 0-20% by weight of a carbonate or hydroxide of one or more metals of said catalytic metal oxides when the catalytic metal oxide of (1) is manganese oxide and from about 1-20% by weight of said carbonate or hydroxide when the catalytic metal oxide of (1) is other than manganese oxide.
Claim 3
Dependent Claim
18 words
The composition of claim 1 containing in addition up to about 70% by weight of a refractory filler.
Claim 4
Dependent Claim
11 words
The composition of claim 2 wherein the refractory filler is silica.
Claim 5
Dependent Claim
20 words
The composition of claim 3 wherein from about 1 to about 50% by weight of the refractory filler is ilmenite.
Claim 6
Dependent Claim
11 words
The composition of claim 2 containing in addition a thixotropic agent.
Claim 7
Dependent Claim
13 words
The composition of claim 1 wherein the catalytic metal oxide is manganese oxide.
Claim 8
Dependent Claim
12 words
The composition of claim 6 wherein the manganese oxide is manganese dioxide.
Claim 9
Dependent Claim
18 words
The composition of claim 6 wherein the carbonate is manganese carbonate and the alkaline silicate is sodium silicate.
Claim 10
Dependent Claim
11 words
The composition of claim 6 containing in addition a refractory filler.
Claim 11
Dependent Claim
11 words
The composition of claim 9 wherein the refractory filler is silica.
Claim 12
Dependent Claim
19 words
The composition of claim 10 wherein from about 1 to 50% by weight of the refractory filler is ilmenite.
Claim 13
Dependent Claim
11 words
The composition of claim 9 containing in addition a thixotropic agent.
Claim 14
Dependent Claim
13 words
The composition of claim 6 wherein the concentration of component (3) is zero.
Claim 15
Dependent Claim
12 words
The composition of claim 13 wherein the alkaline silicate is sodium silicate.
Claim 16
Dependent Claim
11 words
The composition of claim 13 containing in addition a refractory filler.
Claim 17
Dependent Claim
11 words
The composition of claim 15 wherein the refractory filler is silica.
Claim 18
Dependent Claim
19 words
The composition of claim 16 wherein from about 1 to 50% by weight of the refractory filler is ilmenite.
Claim 19
Dependent Claim
11 words
The composition of claim 15 containing in addition a thixotropic agent.
Claim 20
Dependent Claim
77 words
A surface capable of catalyzing the decomposition and oxidation of cooking residues at temperatures below 204° C. comprising a support coated with the composition of claim 1 and thereafter fired at temperatures above about 204° C., said surface having a porosity ranging from about 10 to 30%, a hardness in excess of 3 on moh's scale and losing no more than 15% of its initial porosity at 260° C. when heated to temperatures up to 649° C.
Claim 21
Dependent Claim
77 words
A surface capable of catalyzing the decomposition and oxidation of cooking residues at temperatures below 204° C. comprising a support coated with the composition of claim 5 and thereafter fired at temperatures above about 204° C., said surface having a porosity ranging from about 10 to 30%, a hardness in excess of 3 on Moh's scale and losing no more than 15% of its initial porosity at 260° C. when heated to temperatures up to 649° C.
Claim 22
Dependent Claim
77 words
A surface capable of catalyzing the decomposition and oxidation of cooking residues at temperatures below 204° C. comprising a support coated with the composition of claim 6 and thereafter fired at temperatures above about 204° C., said surface having a porosity ranging from about 10 to 30%, a hardness in excess of 3 on Moh's scale and losing no more than 15% of its initial porosity at 260° C. when heated to temperatures up to 649° C.
Claim 23
Dependent Claim
77 words
A surface capable of catalyzing the decomposition and oxidation of cooking residues at temperatures below 204° C. comprising a support coated with the composition of claim 8 and thereafter fired at temperatures above about 204° C., said surface having a porosity ranging from about 10 to 30%, a hardness in excess of 3 on Moh's scale and losing no more than 15% of its initial porosity at 260° C. when heated to temperatures up to 649° C.
Claim 24
Dependent Claim
77 words
A surface capable of catalyzing the decomposition and oxidation of cooking residues at temperatures below 204° C. comprising a support coated with the composition of claim 12 and thereafter fired at temperatures above about 204° C., said surface having a porosity ranging from about 10 to 30%, a hardness in excess of 3 on Moh's scale and losing no more than 15% of its initial porosity at 260° C. when heated to temperatures up to 649° C.
Claim 25
Dependent Claim
77 words
A surface capable of catalyzing the decomposition and oxidation of cooking residues at temperatures below 204° C. comprising a support coated with the composition of claim 13 and thereafter fired at temperatures above about 204° C., said surface having a porosity ranging from about 10 to 30%, a hardness in excess of 3 on Moh's scale and losing no more than 15% of its initial porosity at 260° C. when heated to temperatures up to 649° C.
Claim 26
Dependent Claim
161 words
A process for making a surface capable of catalyzing the decomposition and oxidation of cooking residues at temperatures below 204° C. comprising the steps of 1. pulverizing manganese oxide in the form of particles having a size of greater than 35 microns and at least 20% by weight of which has a surface area of from about 5-150 square meters per gram to reduce the particle size to less than 35 mirons; 2. preparing a catalytic coating composition by mixing manganese oxide from step (1) in an amount of about 10-94% by weight with at least 1% by weight on a dry basis of an alkaline silicate selected from the group consisting of sodium silicate, lithium silicate, potassium silicate, the silicates of organic bases having a basic dissociation constant greater than 10.sup. -3 , and mixtures thereof, said alkaline silicate being in the form of an aqueous solution and said weight percentages being based on the weight of the total composition;
Claim 27
Dependent Claim
161 words
A process for making a surface capable of catalyzing the decomposition and oxidation of cooking residues at temperatures below 204° C. comprising the steps of 1. pulverizing manganese oxide in the form of particles having a size of greater than 35 microns and at least 20% by weight of which has a surface area of from about 5-150 square meters per gram to reduce the particle size to less than 35 mirons; 2. preparing a catalytic coating composition by mixing manganese oxide from step (1) in an amount of about 10-94% by weight with at least 1% by weight on a dry basis of an alkaline silicate selected from the group consisting of sodium silicate, lithium silicate, potassium silicate, the silicates of organic bases having a basic dissociation constant greater than 10.sup. -3 , and mixtures thereof, said alkaline silicate being in the form of an aqueous solution and said weight percentages being based on the weight of the total composition;
Claim 28
Dependent Claim
24 words
coating a support with the catalytic coating composition of step (2); and 4. firing the coated support at a temperature above about 204° C.
Claim 29
Dependent Claim
24 words
coating a support with the catalytic coating composition of step (2); and 4. firing the coated support at a temperature above about 204° C.
Claim 30
Dependent Claim
12 words
The process of claim 25 wherein the manganese oxide is manganese dioxide.
References Cited (Backward Citations)
US3361531A
Cited
US3460523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |