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US4193793A
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US
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Porous metal-alumina composite
Assignee: Katalistiks International Inc
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Filing: 1977-11-09
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Granted: 1980-03-18
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Expires: 1997-11-09
Abstract
Abstract A porous composite structure comprising a sintered mixture of metal particles and alumina particles, and a method for producing this composite. The composite is useful as a catalyst support, particularly in apparatus designed to reduce pollutant emissions from automobile engines.
Inventors
- 👤 Harry Cheung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:24
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/0215; B01J37/0225; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J23/00; B01J23/38; B01J23/40; B01J23/70; B01J23/72; B01J37/0009; B01J37/024; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12153
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
A porous composite structure comprising a sintered mixture of metal particles and alumina particles characterized by the following parameters: at least 50 weight percent of the particles in the composite are metal particles; at least 5 weight percent of the particles in the composite are alumina particles having a surface area of at least 25 square meters per gram; and the inter-particle porosity in the composite structure is between 5 volume percent and 60 volume percent.
Claim 2
Dependent Claim
76 words
A porous composite structure comprising a sintered mixture of metal particles and alumina particles characterized by the following parameters: at least 50 weight percent of the particles in the composite are metal particles; at least 5 weight percent of the particles in the composite are alumina particles having a surface area of at least 25 square meters per gram; and the inter-particle porosity in the composite structure is between 5 volume percent and 60 volume percent.
Claim 3
Dependent Claim
19 words
The composite structure in accordance with claim 1 wherein about 70 weight percent of the particles are metal particles.
Claim 4
Dependent Claim
52 words
A porous composite structure in accordance with claim 1 consisting essentially of a sintered mixture of metal particles and alumina particles characterized by the following parameters: at least 10 weight percent of the particles in the composite are alumina particles having a surface area of at least 25 square meters per gram.
Claim 5
Dependent Claim
19 words
The composite structure in accordance with claim 3 wherein about 70 weight percent of the particles are metal particles.
Claim 6
Dependent Claim
90 words
A support structure for catalytic materials comprising the combination of a metal screen material having deposited thereon a sintered mixture of metal particles and alumina particles, characterized by the following parameters: at least 50 weight percent of the particles in the sintered mixture are metal particles; at least 5 weight percent of the particles in the sintered mixture are alumina particles having a surface area of at least 25 square meters per gram; and the inter-particle porosity in the sintered mixture is between 15 volume percent and 60 volume percent.
Claim 7
Dependent Claim
90 words
A support structure for catalytic materials comprising the combination of a metal screen material having deposited thereon a sintered mixture of metal particles and alumina particles, characterized by the following parameters: at least 50 weight percent of the particles in the sintered mixture are metal particles; at least 5 weight percent of the particles in the sintered mixture are alumina particles having a surface area of at least 25 square meters per gram; and the inter-particle porosity in the sintered mixture is between 15 volume percent and 60 volume percent.
Claim 8
Dependent Claim
65 words
A support structure for catalytic materials in accordance with claim 5 comprising the combination of a metal screen material having deposited thereon a sintered mixture consisting essentially of metal particles and alumina particles characterized by the following parameters: at least 10 weight percent of the particles in the sintered mixture are alumina particles having a surface area of at least 25 square meters per gram.
Claim 9
Dependent Claim
17 words
The support structure in accordance with claim 6 wherein said metal particles are nickel or stainless steel.
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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) | 1983-03-18 | 1983-09-17 | 1984-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-18 | 1987-09-17 | 1988-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-18 | 1991-09-17 | 1992-03-18 | $7700.00 | Window Closed / Lapsed |