US4197272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic exhaust system
Assignee: Rover Co Ltd
•
Filing: 1976-01-21
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Granted: 1980-04-08
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Expires: 1996-01-21
Abstract
Abstract A catalytic device for the decomposition of nitric oxide comprises a highly conjugated polymer possessing a high concentration of free electrons on sites of the catalyst. In a preferred form, for use in automobile engine exhausts, the polymer is pyrolized polyacrylonitrile.
Inventors
- 👤 Brian Tighe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:56
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J31/00; B01J31/02; B01J31/06; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
58 words
An exhaust system for an internal combustion engine which contains a catalytic device in the exhaust gas flow path of said engine, said catalytic device comprising a catalyst carrier on which is provided a catalyst for the decomposition of nitric oxide comprising a highly conjugated polymer possessing a high concentration of free electrons on sites of the catalyst.
Claim 2
Dependent Claim
58 words
An exhaust system for an internal combustion engine which contains a catalytic device in the exhaust gas flow path of said engine, said catalytic device comprising a catalyst carrier on which is provided a catalyst for the decomposition of nitric oxide comprising a highly conjugated polymer possessing a high concentration of free electrons on sites of the catalyst.
Claim 3
Dependent Claim
16 words
The exhaust system of claim 1 wherein the catalyst comprises pyrolysed polyacrylonitrile or copolymers of acrylonitrile.
Claim 4
Dependent Claim
48 words
The exhaust system of claim 2 with the addition of a comonomer, in proportion of 0.1 to 5.0% by weight, selected from the group consisting of vinyl chloride, styrene, vinyl acetate, isobutylene, acrylic acid, acrylates, 2-vinyl pyridine, 2-methyl -5 vinyl pyridine, N-vinyl pyridine, dimethyl aminoethyl methacrylate, vinylidene chloride.
Claim 5
Dependent Claim
33 words
The exhaust system of claim 2 with the addition of a metal, or oxide of a metal, selected from the group consisting of: iron, cobalt, nickel, copper, chromium, vanadium, molybdenum, manganese and platinum.
Claim 6
Dependent Claim
28 words
The exhaust system of claim 1 wherein the catalyst comprises one of the following polymers: polybenzimidazoles, polyacenequinones, polyimines, polydiphenyldiacetylenes, polymeric metal phthalocyanine complexes, polyindoloinidazoles, pyrolysed polyacrylonitrile, polypyromellitimides, polyphenylene.
Claim 7
Dependent Claim
15 words
The exhaust system of claim 1 wherein the catalyst is deposited onto granules of alumina.
Claim 8
Dependent Claim
28 words
The exhaust system of claim 1 wherein the catalyst is deposited onto granules of alumina and silica where the silica content proportion is 0.02% or less by weight.
Claim 9
Dependent Claim
17 words
The exhaust system of claim 1 wherein the catalyst is deposited onto a ceramic honeycomb matrix support.
References Cited (Backward Citations)
US2929792A
Cited
US3479300A
Cited
US3515677A
Cited
US3617506A
Cited
US3671591A
Cited
US3773894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |