Patent US4797263A successfully refreshed from Google Patents.
US4797263A
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US
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Monolithic catalytic converter with improved gas distribution
Assignee: Motors Liquidation Co
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Filing: 1987-08-06
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Granted: 1989-01-10
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Expires: 2007-08-06
Abstract
Abstract A catalytic converter has a monolith with a plurality of catalyst coated passages to which internal combustion engine exhaust gases are directed with a nonuniform velocity profile that is highest at the center. A flow distributor is mounted in the converter downstream of the monolith that restricts flow centrally through the monolith while allowing relatively free flow radially outward toward the periphery to thereby alter the velocity profile at the entrance to the monolith so as to effect substantially equal distribution of the gases between all the monolith passages without extracting heat from the gases prior to entering same and without adding substantial back pressure.
Inventors
- 👤 Rajshekhar D. Oza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:55
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2892; F01N2330/00; F01N2330/02; F01N2330/06; F01N2350/00; F01N2350/02; F01N2350/04; F01N2470/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A method of redistributing exhaust gases from an internal combustion engine comprising providing a catalytic converter consisting essentially of a housing, a catalyst coated monolith and a downstream deflector adjacent a downstream face of the monolith, passing exhaust gases through the monolith and downstream deflector and selectively blocking flow across the entire downstream race of said monolith to produce a centrally located, relatively small, restricted flow region and a radially outwardly located, relatively large substantially unrestricted flow region parallel to said central region, whereby a substantially uniform distribution of gases between the passages at their entrance to the monolith is achieved without increasing catalyst warm-up time or adding substantial back pressure.
Claim 2
Independent Claim
111 words
A method of redistributing exhaust gases from an internal combustion engine comprising providing a catalytic converter consisting essentially of a housing, a catalyst coated monolith and a downstream deflector adjacent a downstream face of the monolith, passing exhaust gases through the monolith and downstream deflector and selectively blocking flow across the entire downstream race of said monolith to produce a centrally located, relatively small, restricted flow region and a radially outwardly located, relatively large substantially unrestricted flow region parallel to said central region, whereby a substantially uniform distribution of gases between the passages at their entrance to the monolith is achieved without increasing catalyst warm-up time or adding substantial back pressure.
Claim 3
Independent Claim
120 words
A method of redistributing exhaust gases from an internal combustion engine comprising providing a catalytic converter consisting essentially of a housing, a catalyst coated monolith and downstream deflector adjacent a downstream face of the monolith, passing exhaust gases through the monolith and downstream deflector and selectively blocking flow across the entire downstream face of said monolith in progressively lesser amounts radially outward from the center thereof to produce a centrally located, relatively small, restricted flow region and a radially outwardly located, relatively large substantially unrestricted flow region parallel to said central region, whereby a substantially uniform distribution of gases between the passages at their entrance to the monolith is achieved without increasing catalyst warm-up time or adding substantial back pressure.
Claim 4
Independent Claim
120 words
A method of redistributing exhaust gases from an internal combustion engine comprising providing a catalytic converter consisting essentially of a housing, a catalyst coated monolith and downstream deflector adjacent a downstream face of the monolith, passing exhaust gases through the monolith and downstream deflector and selectively blocking flow across the entire downstream face of said monolith in progressively lesser amounts radially outward from the center thereof to produce a centrally located, relatively small, restricted flow region and a radially outwardly located, relatively large substantially unrestricted flow region parallel to said central region, whereby a substantially uniform distribution of gases between the passages at their entrance to the monolith is achieved without increasing catalyst warm-up time or adding substantial back pressure.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |