Patent US1885401A successfully refreshed from Google Patents.
Patent US3749199A successfully refreshed from Google Patents.
US3749199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas muffler for internal combustion engines of vehicles
Assignee: Dr Ing HCF Porsche AG
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Filing: 1972-03-09
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Granted: 1973-07-31
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Expires: 1992-03-09
Abstract
Abstract An exhaust gas muffler for internal combustion engines of vehicles, especially for internal combustion engines of sports vehicles, which participate both in traffic on public roads as also in closed sporting events; the exhaust gas muffler which is provided with silencing means is constructed as combination muffler having several exhaust pipes, in which the conduction of the exhaust gases from the internal combustion engine to the exhaust pipes takes place selectively by way of the silencing means of the muffler or in by-passing relationship to the silencing means into the atmosphere.
Inventors
- 👤 J Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:53
CPC Classifications
F; F01; F01N; F01N13/00; F01N1/00; F01N1/08; F01N1/084; F01N1/089; F01N1/16; F01N1/166
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
An exhaust muffler for internal combustion engines comprising a muffler pot having a plurality of internal chambers, said chambers being provided with means for soundproofing, a plurality of exhaust pipes securedly extending through said muffler pot, each said exhaust pipe of said plurality having a first end connected to the internal combustion engine exhaust manifold and a second end being a discharge opening, an additional exhaust pipe having a first end secured to said muffler pot and having a second end being a discharge opening, and means for selectively covering said discharge openings of said plurality of exhaust pipes.
Claim 2
Dependent Claim
99 words
An exhaust muffler for internal combustion engines comprising a muffler pot having a plurality of internal chambers, said chambers being provided with means for soundproofing, a plurality of exhaust pipes securedly extending through said muffler pot, each said exhaust pipe of said plurality having a first end connected to the internal combustion engine exhaust manifold and a second end being a discharge opening, an additional exhaust pipe having a first end secured to said muffler pot and having a second end being a discharge opening, and means for selectively covering said discharge openings of said plurality of exhaust pipes.
Claim 3
Dependent Claim
20 words
An exhaust muffler according to claim 1, wherein said means for soundproofing are pipe-lines extending between said plurality of chambers.
Claim 4
Dependent Claim
18 words
An exhaust muffler according to claim 1, wherein said plurality of exhaust pipes include at least two pipes.
Claim 5
Dependent Claim
32 words
An exhaust muffler according to claim 1, wherein each said exhaust pipe of said plurality extending through said muffler pot is provided with a plurality of apertures opening into said muffler pot.
Claim 6
Dependent Claim
30 words
An exhaust muffler according to claim 1, wherein the discharge opening end of each said exhaust pipe of said plurality is provided with at least one outwardly curved cam means.
Claim 7
Dependent Claim
20 words
An exhaust muffler according to claim 1, wherein said means for covering are pot-shaped and consist of a heat-resistant material.
Claim 8
Dependent Claim
48 words
An exhaust muffler according to claim 5, wherein said means for covering are pot-shaped and consist of a heat resistant material, an edge of said means for covering being provided with at least one groove in the manner of a bayonet connector which engages into said cam means.
Claim 9
Dependent Claim
32 words
An exhaust muffler according to claim 1, wherein said means for covering are secured to said discharge opening ends of each said exhaust pipe of said plurality by a clamping band means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |