US4237030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for purifying exhaust gas from an internal combustion engine
Assignee: NGK Insulators Ltd
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Filing: 1978-07-10
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Granted: 1980-12-02
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Expires: 1998-07-10
Abstract
Abstract A catalyst support characterized by having a total pore volume ranging 0.05-0.5 cc/g. an average pore diameter ranging from 0.05-5μ and consisting mainly of α-alumina; and an internal combustion engine exhaust gas purifying catalyst made of said catalyst support carrying a catalytic agent.
Inventors
- 👤 Masaaki Noguchi
- 👤 Tsuchio Bunda
- 👤 Noboru Yamamoto
- 👤 Shigeo Soejima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:12
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J21/00; B01J21/02; B01J21/04; B01J35/63; B01J35/633; B01J35/64; B01J35/651; B01J35/653
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
A catalyst for purifying exhaust gas from an internal combustion engine comprising: a catalyst carrier characterized by having a total pore volume of 0.05-0.50 cc/g, and an average pore diameter of 0.05-0.05μ, and consisting mainly of over 80% by weight of α-alumina and less than 20% by weight of sintering promoter; and a catalyst consisting essentially of platinum catalyst material.
Claim 2
Dependent Claim
60 words
A catalyst for purifying exhaust gas from an internal combustion engine comprising: a catalyst carrier characterized by having a total pore volume of 0.05-0.50 cc/g, and an average pore diameter of 0.05-0.05μ, and consisting mainly of over 80% by weight of α-alumina and less than 20% by weight of sintering promoter; and a catalyst consisting essentially of platinum catalyst material.
Claim 3
Dependent Claim
14 words
The catalyst of claim 1, in which the total pore volume is 0.10-0.35 cc/g.
Claim 4
Dependent Claim
45 words
The catalyst of claim 1 wherein said sintering promoter is at least one compound selected from the group consisting of SiO 2 , TiO 2 , ZrO 2 , CaO, MgO, B 2 O 3 , MnO 2 , Cr 2 O 3 and CuO.
Claim 5
Dependent Claim
12 words
The catalyst of claim 1 wherein said carrier is of spherical shape.
Claim 6
Dependent Claim
12 words
The catalyst of claim 1 wherein said carrier is of cylindrical shape.
Claim 7
Dependent Claim
12 words
The catalyst of claim 1 wherein said carrier is of columnar shape.
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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |