US3983696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion engine having at least one outlet passage
Assignee: Audi AG
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Filing: 1975-05-14
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Granted: 1976-10-05
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Expires: 1995-05-14
Abstract
Abstract A combustion engine having at least one outlet passage for expulsion of the burned gases. The outlet passage terminates at the outer surface of the engine and communicates with an exhaust pipe connected to the outer surface by a flange and an intervening gasket. A tubular liner is arranged in the outlet passage and forms an annular cavity together with the wall of the passage. The liner extends free from the outlet passage through the gasket and the flange into the adjoining exhaust pipe.
Inventors
- 👤 Karl Pflugfelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:01
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
An internal combustion engine comprising; an outlet port for the expulsion of the burnt gases, terminating at the outer surface of the engine and communicating with an exhaust pipe provided with a heat insulation and connected to the outer surface by a flange and an intervening gasket, a tubular port liner arranged in the outlet port and forming an annular cavity together with the wall of the port and being fixed at its engine end in the outlet port and being free at its other end and having an annular bulge near the junction between the outlet port and the exhaust pipe, by which bulge it rests against the wall of the outlet port, said liner extending beyond said bulge from the outlet port in spaced relationship through said gasket and flange into the exhaust pipe so far that its free end lies in the region of the heat insulation.
Claim 2
Dependent Claim
150 words
An internal combustion engine comprising; an outlet port for the expulsion of the burnt gases, terminating at the outer surface of the engine and communicating with an exhaust pipe provided with a heat insulation and connected to the outer surface by a flange and an intervening gasket, a tubular port liner arranged in the outlet port and forming an annular cavity together with the wall of the port and being fixed at its engine end in the outlet port and being free at its other end and having an annular bulge near the junction between the outlet port and the exhaust pipe, by which bulge it rests against the wall of the outlet port, said liner extending beyond said bulge from the outlet port in spaced relationship through said gasket and flange into the exhaust pipe so far that its free end lies in the region of the heat insulation.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |