Patent US3996740A successfully refreshed from Google Patents.
US3996740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust systems
Assignee: Ethyl Corp
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Filing: 1975-02-19
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Granted: 1976-12-14
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Expires: 1995-02-19
Abstract
Abstract The useful life of a catalyst being used in an engine exhaust system to lower the undesirable constituents in the exhaust gas of an engine being operated on gasoline containing a cyclopentadienyl manganese antiknock is greatly prolonged by providing an exhaust system having a plurality of substantially parallel proximately spaced vanes in the exhaust flow path upstream from the catalyst. The vanes have elongated recesses in their surface.
Inventors
- 👤 Leonard M. Niebylski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:30
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; F01N3/2828; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; F01N3/2882; F01N3/2892; F01N2240/00; F01N2240/20; F01N2430/00; F01N2430/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
In an exhaust system for an internal combustion engine, said system comprising a catalytic reactor containing a catalyst bed, said catalytic reactor being operatively connected by exhaust conduit means to receive the exhaust gas from said internal combustion engine, the improvement which comprises a plurality of substantially parallel proximately spaced vanes located in the exhaust flow path between said engine and said catalyst bed, the surface of said vanes being substantially aligned with said exhaust flow path, said vanes having elongated recesses in their surface.
Claim 2
Dependent Claim
85 words
In an exhaust system for an internal combustion engine, said system comprising a catalytic reactor containing a catalyst bed, said catalytic reactor being operatively connected by exhaust conduit means to receive the exhaust gas from said internal combustion engine, the improvement which comprises a plurality of substantially parallel proximately spaced vanes located in the exhaust flow path between said engine and said catalyst bed, the surface of said vanes being substantially aligned with said exhaust flow path, said vanes having elongated recesses in their surface.
Claim 3
Dependent Claim
18 words
An improved exhaust system of claim 1 wherein said catalyst bed is a monolithic honeycomb ceramic supported catalyst.
Claim 4
Dependent Claim
18 words
An improved exhaust system of claim 2 wherein said recesses are aligned in the direction of exhaust flow.
Claim 5
Dependent Claim
17 words
An improved exhaust system of claim 3 wherein said recesses are on both surfaces of said vanes.
Claim 6
Dependent Claim
136 words
An article of manufacture especially adapted for installation in an exhaust system of an internal combustion engine between said engine and a catalytic reactor and which inhibits plugging of said catalytic reactor when said engine is operated on gasoline containing a cyclopentadienyl manganese antiknock, said article comprising a conduit member having connection means at both ends, one of said connection means being adapted to connect with the exhaust pipe from said engine and receive engine exhaust gas, the other of said connection means being adapted to connect to conduit means leading to the entry port of said catalytic reactor, a plurality of substantially parallel proximately spaced vanes located in said conduit member, the surface of said vanes being substantially aligned with the longitudinal axis of said conduit member, said vanes having elongated recesses in their surface.
Claim 7
Dependent Claim
136 words
An article of manufacture especially adapted for installation in an exhaust system of an internal combustion engine between said engine and a catalytic reactor and which inhibits plugging of said catalytic reactor when said engine is operated on gasoline containing a cyclopentadienyl manganese antiknock, said article comprising a conduit member having connection means at both ends, one of said connection means being adapted to connect with the exhaust pipe from said engine and receive engine exhaust gas, the other of said connection means being adapted to connect to conduit means leading to the entry port of said catalytic reactor, a plurality of substantially parallel proximately spaced vanes located in said conduit member, the surface of said vanes being substantially aligned with the longitudinal axis of said conduit member, said vanes having elongated recesses in their surface.
Claim 8
Dependent Claim
18 words
An article of claim 5 wherein said recesses are aligned with the longitudinal axis of said conduit member.
Claim 9
Dependent Claim
14 words
An article of claim 6 wherein said vanes are spaced about 2-7 mm apart.
Claim 10
Dependent Claim
14 words
An article of claim 6 wherein said vanes have elongated recesses in both surfaces.
Claim 11
Dependent Claim
14 words
An article of claim 8 wherein said vanes are spaced about 2-7 mm apart.
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) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |