US3852042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic converter with exhaust gas modulating chamber for preventing damage to catalyst substrate
Assignee: Universal Oil Products Co
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Filing: 1973-01-29
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Granted: 1974-12-03
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Expires: 1993-01-29
Abstract
Abstract Catalytic converter incorporates elements for supporting a ceramic, honeycomb type, catalyst substrate and protecting it from damage caused by exhaust gas pulsations and variations in thermal expansion between the substrate and the metal casing which supports it. A pair of spaced, dome-shaped, perforated screens positioned between the converter inlet and the catalyst substrate serve to dampen out and modulate the exhaust gas pulsations. The screens are spaced by a spacing element having a greater coefficient of thermal expansion than the converter causing so that compression forces will be maintained on the substrate, which has a low expansion coefficient, as the converter housing is heated.
Inventors
- 👤 M Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:50
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2839; F01N3/2853; F01N3/2867; F01N3/2892; F01N2260/00; F01N2260/08; F01N2260/10; F01N2330/00; F01N2330/06; F01N2350/00; F01N2350/02; F01N2350/06; F01N2530/00; F01N2530/02; F01N2530/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
IN A CATALYTIC CONVERTER FOR TREATING EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE AHD HAVING A METAL HOUSING INCLUDING INLET AND OUTLET MEANS INCLUDING FITTINGS ADAPTED TO RECEIVE AN EXHAUST CONDUIT AND AN AXIALLY POROUS, CATALYST COATED CERAMIC ELEMENT THEREIN, THE IMPROVEMENT COMPRISING AT LEAST ONE TRANVERSELY POSITIONED PERFORATED METAL INLET SCREEN POSITIONED INTERMEDIATE SAID INLET FITTING SAID CERAMIC ELEMENT, ELONGATED SPACER MEANS LONGITUDINAL MOVABLE POSITIONED INTERMEDIATE SAID INLET FITTING AND SAID CERAMIC ELEMENT, FOR SPACING SAID CERAMIC ELEMENT FROM SAID INLET MEANS, SAID SPACER MEANS HAVING A HIGHER TEMPERATURE COEFFICIENT OF EXPANSION THAN SAID METAL HOUSING AND SAID HOUSING HAVING A HIGHER TEMPERATURE COEFFICIENT OF EXPANSION THAN SAID CERAMIC ELEMENT, SAID SPACER MEANS AND SAID HOUSING CONSTITUTING A THERMAL EFFECT COMPENSATING MEANS ARRANGED AND CONSTRUCTED SO THAT THE RELATIVE SHRINKAGE OF SAID CERAMIC ELEMENT RELATIVE TO SAID HOUSING DURING HEATING WILL BE AT LEAST PARTIALLY OFFSET BY THE RELATIVE EXPANSION OF SAID SPACER MEANS RELTIVE TO SAID HOUSING.
Claim 2
Dependent Claim
159 words
IN A CATALYTIC CONVERTER FOR TREATING EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE AHD HAVING A METAL HOUSING INCLUDING INLET AND OUTLET MEANS INCLUDING FITTINGS ADAPTED TO RECEIVE AN EXHAUST CONDUIT AND AN AXIALLY POROUS, CATALYST COATED CERAMIC ELEMENT THEREIN, THE IMPROVEMENT COMPRISING AT LEAST ONE TRANVERSELY POSITIONED PERFORATED METAL INLET SCREEN POSITIONED INTERMEDIATE SAID INLET FITTING SAID CERAMIC ELEMENT, ELONGATED SPACER MEANS LONGITUDINAL MOVABLE POSITIONED INTERMEDIATE SAID INLET FITTING AND SAID CERAMIC ELEMENT, FOR SPACING SAID CERAMIC ELEMENT FROM SAID INLET MEANS, SAID SPACER MEANS HAVING A HIGHER TEMPERATURE COEFFICIENT OF EXPANSION THAN SAID METAL HOUSING AND SAID HOUSING HAVING A HIGHER TEMPERATURE COEFFICIENT OF EXPANSION THAN SAID CERAMIC ELEMENT, SAID SPACER MEANS AND SAID HOUSING CONSTITUTING A THERMAL EFFECT COMPENSATING MEANS ARRANGED AND CONSTRUCTED SO THAT THE RELATIVE SHRINKAGE OF SAID CERAMIC ELEMENT RELATIVE TO SAID HOUSING DURING HEATING WILL BE AT LEAST PARTIALLY OFFSET BY THE RELATIVE EXPANSION OF SAID SPACER MEANS RELTIVE TO SAID HOUSING.
Claim 3
Dependent Claim
19 words
A catalytic converter in accordance with claim 1 wherein said at least one perforated metal inlet screen is dome-shaped.
Claim 4
Dependent Claim
35 words
A catalytic converter in accordance with claim 1 wherein said housing includes axially spaced, radial retaining elements between which said at least one inlet screen, said spacer element and said ceramic element are axially positioned.
Claim 5
Dependent Claim
18 words
A catalytic converter in accordance with claim 1 wherein said spacer element comprises an annular metal channel member.
Claim 6
Dependent Claim
23 words
A catalytic converter in accordance with claim 1 wherein said spacer element and said housing are made of different alloys of stainless steel.
Claim 7
Dependent Claim
26 words
A catalytic converter in accordance with claim 1 wherein at least two perforated metal inlet screens are positioned intermediate said inlet fitting and said ceramic element.
Claim 8
Dependent Claim
23 words
A catalytic converter in accordance with claim 6 wherein at least one of said at least two perforated metal inlet screens is dome-shaped.
Claim 9
Dependent Claim
35 words
A catalytic converter in accordance with claim 1 wherein said at least one metal inlet screen is perforated so as to provide an open area larger than the cross sectional area of the inlet fitting.
Claim 10
Dependent Claim
48 words
A catalytic converter in accordance with claim 8 wherein at least two perforated metal inlet screens are positioned intermediate said inlet fitting and said ceramic element, each of said screens being perforated so as to provide an open area larger than the cross-sectional area of the inlet fitting.
Claim 11
Dependent Claim
30 words
A catalytic converter in accordance with claim 2 wherein said screens are perforated to provide an open area about 50 percent greater than the cross-sectional area of the inlet fitting.
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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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |