Patent US3931050A successfully refreshed from Google Patents.
US3931050A
Expired / Lapsed
US
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Catalyst for purifying exhaust gas from vehicles
Assignee: Denso Corp
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Filing: 1974-04-12
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Granted: 1976-01-06
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Expires: 1994-04-12
Abstract
Abstract A catalyst for purifying exhaust gas from vehicles comprises a monolithic carrier having a plurality of exhaust gas passages penetrating through the carrier, a layer of active refractory metallic oxide such as γ-alumina, containing 1 to 20% by weight of a catalytic metal such as platinum deposited as first layer on inside surfaces of said plurality of the passages, and a layer of exhaust gas-permeable refractory metallic oxide such as γ-alumina free from a catalytic metal deposited as an outermost layer further upon the first layer.
Inventors
- 👤 Mitsuru Asano
- 👤 Minoru Ohta
- 👤 Masami Oki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:39
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/944; B01J23/54; B01J23/56; B01J37/00; B01J37/02; B01J37/024; B01J37/0244; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1026; B01D2255/20; B01D2255/202; B01D2255/2025; B01D2255/204; B01D2255/2042; B01D2255/206; B01D2255/2063
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A catalyst for purifying exhaust gas from vehicles, which comprises a monolithic carrier having a plurality of exhaust gas passages penetrating through the carrier, a layer of active refractory metallic oxide selected from the group consisting of γ-alumina, magnesium oxide, beryllium oxide and thorium oxide containing a catalytic metal of the platinum group deposited as first layer on inside surfaces of said plurality of the passages, and a layer of exhaust gas-permeable refractory metallic oxide selected from the group consisting of γ-alumina, magnesium oxide, beryllium oxide, thorium oxide, lanthanum oxide, barium oxide and lithium oxide free from said catalytic metal deposited as an outermost layer
Claim 2
Dependent Claim
105 words
A catalyst for purifying exhaust gas from vehicles, which comprises a monolithic carrier having a plurality of exhaust gas passages penetrating through the carrier, a layer of active refractory metallic oxide selected from the group consisting of γ-alumina, magnesium oxide, beryllium oxide and thorium oxide containing a catalytic metal of the platinum group deposited as first layer on inside surfaces of said plurality of the passages, and a layer of exhaust gas-permeable refractory metallic oxide selected from the group consisting of γ-alumina, magnesium oxide, beryllium oxide, thorium oxide, lanthanum oxide, barium oxide and lithium oxide free from said catalytic metal deposited as an outermost layer
Claim 3
Dependent Claim
12 words
A catalyst according to claim 1, wherein the catalytic metal comprise at
Claim 4
Dependent Claim
13 words
A catalyst according to claim 1 including also at least one oxide of
Claim 5
Dependent Claim
39 words
A catalyst according to claim 1, wherein 1 to 20 % by weight of the catalytic metal is contained in the first layer on the basis of the weight of the active refractory metallic oxide layer containing the catalytic
Claim 6
Dependent Claim
21 words
A catalyst according to claim 1, wherein the catalytic metal is platinum, and the active refractory metallic oxide and the exhaust
Claim 7
Dependent Claim
22 words
A catalyst according to claim 4, wherein an amount of the γ-alumina as the active refractory metallic oxide is four to 30
Claim 8
Dependent Claim
32 words
A catalyst according to claim 1, wherein the catalytic metal is a mixture of platinum and ruthenium, and the active refractory metal oxide and the exhaust gas-permeable refractory metal oxide are γ-alumina.
Claim 9
Dependent Claim
12 words
A catalyst according to claim 1 wherein the catalytic metal consists of
Claim 10
Dependent Claim
13 words
A catalyst according to claim 1 wherein the catalytic metal is a mixture
Claim 11
Dependent Claim
27 words
A catalyst according to claim 1 wherein the catalytic metal is a mixture of platinum and at least one oxide of nickel, iron, cobalt, copper or chromium.
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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |