US3972687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic converter having pressurized-gas support means
Assignee: Gillet Paul GmbH
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Filing: 1974-03-21
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Granted: 1976-08-03
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Expires: 1994-03-21
Abstract
Abstract Exhaust system especially for motor vehicles of the type having a monolith of ceramic material serving as a catalyst support disposed in a metallic housing, said monolith being supported only radially in a double walled mantle having an inner wall of thin foil-like material closely encompassing the monolith and an outer wall defining the sole support connected at the ends in seal-like fashion and the inner space of which is filled with gas under pressure.
Inventors
- 👤 Gunther B. Frietzsche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:02
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/14; F01N13/141; F01N13/143; F01N13/009; F01N13/0097; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2839; F01N3/2853; F01N2450/00; F01N2450/02; F01N2450/18; F01N2450/30; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
Exhaust system, especially for motor vehicles, comprising an exhaust pipe and an exhaust gas purifying device of the type having a monolith of ceramic material carrying a catalyst, the monolith being disposed in a metallic housing having an inlet and an outlet for exhaust gas being purified, said monolith being supported only radially in a double walled mantle having a thin inner sheet metal wall closely encompassing the monolith and an outer housing wall, said double walled mantle defining the sole support, said inner and outer walls being connected at their longitudinal ends exclusively by sealing one wall to the other and defining between them an annular space, which is filled with gas under pressure, and a conduit connecting said annular space to a source of gas under pressure.
Claim 2
Dependent Claim
129 words
Exhaust system, especially for motor vehicles, comprising an exhaust pipe and an exhaust gas purifying device of the type having a monolith of ceramic material carrying a catalyst, the monolith being disposed in a metallic housing having an inlet and an outlet for exhaust gas being purified, said monolith being supported only radially in a double walled mantle having a thin inner sheet metal wall closely encompassing the monolith and an outer housing wall, said double walled mantle defining the sole support, said inner and outer walls being connected at their longitudinal ends exclusively by sealing one wall to the other and defining between them an annular space, which is filled with gas under pressure, and a conduit connecting said annular space to a source of gas under pressure.
Claim 3
Dependent Claim
35 words
Exhaust system in accordance with claim 1, including connection elements between the housing surrounding said monolith and the pipes of said exhaust system, said connection elements being frusto-conical and including releasable means such as flanges.
Claim 4
Dependent Claim
58 words
Exhaust system in accordance with claim 1 wherein the housing surrounding said monolith comprises the supporting mantle for said monolith and said mantle further comprises a third mantle member defining an intermediate, perforated support wall disposed between said outer housing wall and said thin inner sheet metal wall, all of said mantles being sealed together in gas-tight fashion.
Claim 5
Dependent Claim
31 words
Exhaust system in accordance with claim 3 comprising a layer of mineral fiber fleece, having a high heat resistance, disposed between said inner wall and the adjacent surface of said monolith.
Claim 6
Dependent Claim
33 words
Exhaust system in accordance with claim 1, wherein said gas source comprises a reserve pressure container and said connecting conduit includes a pressure reducing valve, a check valve and a manometer connected therewith.
Claim 7
Dependent Claim
19 words
Exhaust system in accordance with claim 5, wherein said reserve pressure container is the spare tire of the vehicle.
Claim 8
Dependent Claim
16 words
Exhaust system in accordance with claim 5, including a compressor connected to said reserve pressure container.
Claim 9
Dependent Claim
16 words
Exhaust system in accordance with claim 7, comprising a hydraulic pump connected to said pressure container.
Claim 10
Dependent Claim
17 words
Exhaust system in accordance with claim 7, including an air pump for supplying said compressor with air.
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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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |