US4426320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst composition for exhaust gas treatment
Assignee: WR Grace and Co Conn
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Filing: 1982-06-17
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Granted: 1984-01-17
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Expires: 2002-06-17
Abstract
Abstract Suspended particles in exhaust gases, such as carbon and lead particles in internal combustion engine exhaust gases, are removed by passing the gases through a coarse filter and then through a fine filter. The filters may comprise a ceramic foam material and a catalyst material effective for the conversion of the carbon particles and/or gaseous pollutants in the exhaust gases to innocuous entities may be deposited on the filters.
Inventors
- 👤 Michael V. Ernest
- 👤 James M. Maselli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:39
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; F; F01; F01N; F01N13/00; F01N13/009; F01N3/00; F01N3/02; F01N3/021; F01N3/033; F01N3/035; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; F01N2330/00; F01N2330/06; F01N2570/00; F01N2570/02; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
A composition for converting one or more pollutants in an exhaust gas to innocuous entities and removing suspended particles from the gas which comprises a catalyst material effective for the conversion deposited on a coarse ceramic foam filter having a pore size of from about 2 to about 20 pores per 25 millimeters in length and on a fine ceramic foam filter having a pore size of from about 15 to about 50 pores per 25 millimeters in length, said filters positioned so that the gas flows in succession through the coarse filter and the fine filter.
Claim 2
Dependent Claim
97 words
A composition for converting one or more pollutants in an exhaust gas to innocuous entities and removing suspended particles from the gas which comprises a catalyst material effective for the conversion deposited on a coarse ceramic foam filter having a pore size of from about 2 to about 20 pores per 25 millimeters in length and on a fine ceramic foam filter having a pore size of from about 15 to about 50 pores per 25 millimeters in length, said filters positioned so that the gas flows in succession through the coarse filter and the fine filter.
Claim 3
Dependent Claim
20 words
The composition of claim 1 in which the filters have a porosity of from about 80 to about 95 percent.
Claim 4
Dependent Claim
23 words
The composition of claim 1 in which the filters have an air permeability of from about 400 to about 8000×10 -7 square centimeters.
Claim 5
Dependent Claim
48 words
The composition of claim 1 in which the coarse filter has a pore size of from about 6 to about 20 pores per 25 millimeters in length and the fine filter has a pore size of from about 17 to about 30 pores per 25 millimeters in length.
Claim 6
Dependent Claim
42 words
The composition of claim 1 in which the coarse filter has an air permeability of from about 2500 to about 8000×10 -7 square centimeters and the fine filter has an air permeability of from about 400 to about 2500×10 -7 square centimeters.
Claim 7
Dependent Claim
18 words
The composition of claim 1 in which the catalyst material is effective for the combustion of carbon particles.
Claim 8
Dependent Claim
23 words
The composition of claim 6 in which the catalyst material comprises an element of the first transition series, silver, hafnium, or mixtures thereof.
Claim 9
Dependent Claim
70 words
The composition of claim 1 in which the catalyst material comprises a mixture of catalytically-effective amounts of at least one supported material selected from the group consisting of a noble metal, chromium, and catalytically-active compounds thereof, said material supported on a porous refractory inorganic oxide, and at least one bulk material selected from the group consisting of an element of the first transition series, silver, hafnium, and catalytically-active compounds thereof.
Claim 10
Dependent Claim
20 words
The composition of claim 8 in which the supported material comprises a platinum group metal, chromium oxide, or mixtures thereof.
Claim 11
Dependent Claim
18 words
The composition of claim 8 in which the bulk material comprises copper oxide, chromium oxide, or mixtures thereof.
Claim 12
Dependent Claim
57 words
The composition of claim 8 in which the catalyst material comprises a mixture of from about 40 to about 60 weight percent of a supported material comprising a platinum group metal, chromium oxide, or mixtures thereof supported on a transitional alumina and from about 40 to about 60 weight percent of a bulk material comprising copper oxide.
Claim 13
Dependent Claim
89 words
A composition for collecting and disposing of carbon particulates in exhaust gases of internal combustion engines which comprises a carbon combustion catalyst material deposited on a coarse ceramic foam filter having a pore size of from about 2 to about 20 pores per 25 millimeters in length and a fine ceramic foam filter having a larger pore size of from about 15 to about 50 pores per 25 millimeters in length, said filters positioned so that the gases flow in succession through the coarse filter and the fine filter.
Claim 14
Dependent Claim
89 words
A composition for collecting and disposing of carbon particulates in exhaust gases of internal combustion engines which comprises a carbon combustion catalyst material deposited on a coarse ceramic foam filter having a pore size of from about 2 to about 20 pores per 25 millimeters in length and a fine ceramic foam filter having a larger pore size of from about 15 to about 50 pores per 25 millimeters in length, said filters positioned so that the gases flow in succession through the coarse filter and the fine filter.
Claim 15
Dependent Claim
23 words
The composition of claim 12 in which the catalyst material comprises an element of the first transition series, silver, hafnium, or mixtures thereof.
Claim 16
Dependent Claim
70 words
The composition of claim 12 in which the catalyst material comprises a mixture of catalytically-effective amounts of at least one supported material selected from the group consisting of a noble metal, chromium, and catalytically-active compounds thereof, said material supported on a porous refractory inorganic oxide, and at least one bulk material selected from the group consisting of an element of the first transition series, silver, hafnium, and catalytically-active compounds thereof.
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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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |