US3765506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound attenuating muffler
Assignee: Tenneco Inc
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Filing: 1972-11-08
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Granted: 1973-10-16
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Expires: 1992-11-08
Abstract
Abstract A muffler suitable for use in an internal combustion engine exhaust system has a tubular member extending the full length of an outer shell to provide a gas passage connecting the inlet end to the outlet end of the shell and has a reduced diameter central portion which is surrounded by an inner shell that communicates with the interior of the gas flow passage by means of perforations in the wall of the tubular member, the tubular member also containing perforations on opposite sides of the inner shell that open into a chamber between a tubular member and the outer shell.
Inventors
- 👤 L Strunk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:07
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/02; F01N1/04; F01N2490/00; F01N2490/15
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
152 words
An exhaust gas muffler or the like comprising an elongated tubular outer shell having an inlet and an outlet at opposite ends, a gas flow conduit connecting the inlet and outlet and extending straight through the shell and providing a straight through gas flow path for gas to pass through the muffler, an inner shell mounted on the gas flow tube conduit and extending along a substantial part of the central portion of the conduit, flow obstructing means in the conduit and located axially within that portion of the conduit covered by the inner shell, said outer shell defining an outer chamber around the conduit and said inner shell defining an inner chamber around the conduit, said conduit having first perforations opening into the inner chamber on at least one side of the obstruction means, said conduit having second perforations opening into the outer chamber on each side of said inner shell.
Claim 2
Dependent Claim
152 words
An exhaust gas muffler or the like comprising an elongated tubular outer shell having an inlet and an outlet at opposite ends, a gas flow conduit connecting the inlet and outlet and extending straight through the shell and providing a straight through gas flow path for gas to pass through the muffler, an inner shell mounted on the gas flow tube conduit and extending along a substantial part of the central portion of the conduit, flow obstructing means in the conduit and located axially within that portion of the conduit covered by the inner shell, said outer shell defining an outer chamber around the conduit and said inner shell defining an inner chamber around the conduit, said conduit having first perforations opening into the inner chamber on at least one side of the obstruction means, said conduit having second perforations opening into the outer chamber on each side of said inner shell.
Claim 3
Dependent Claim
22 words
A muffler as set forth in claim 1 wherein said first perforations are only on the upstream side of the obstructing means.
Claim 4
Dependent Claim
24 words
A muffler as set forth in claim 1 wherein said first perforations and said inner chamber are tuned to attenuate a predetermined sound frequency.
Claim 5
Dependent Claim
32 words
A muffler as set forth in claim 3 wherein said inner chamber has a length extending from said first perforations that is substantially equal to one quarter wave length of said frequency.
Claim 6
Dependent Claim
39 words
A muffler as set forth in claim 1 wherein said first perforations are located only at an end of said inner chamber and said inner chamber has a length substantially equal to a quarter wave length of said frequency.
Claim 7
Dependent Claim
22 words
A muffler as set forth in claim 5 wherein said first perforations are located on the upstream side of said obstructing means.
Claim 8
Dependent Claim
14 words
A muffler as set forth in claim 6 wherein said first perforations are louvers.
Claim 9
Dependent Claim
25 words
A muffler as set forth in claim 1 wherein said first perforations are located on both the upstream and downstream sides of said obstructing means.
Claim 10
Dependent Claim
19 words
A muffler as set forth in claim 8 wherein said outer chamber is substantially filled with sound absorbent material.
Claim 11
Dependent Claim
20 words
A muffler as set forth in claim 1 wherein said obstructing means comprises a reduced diameter section in said conduit.
Claim 12
Dependent Claim
25 words
A muffler as set forth in claim 10 wherein said conduit has angularly spaced radially extending U-shaped pinches therein to form said reduced diameter sectiOn.
Claim 13
Dependent Claim
41 words
A muffler as set forth in claim 11 wherein said conduit comprises axially separated coaxial inlet and outlet tubes and a connector tube element joining said inlet and outlet tubes, said reduced diameter section being formed in said connector tube element.
Claim 14
Dependent Claim
49 words
A muffler as set forth in claim 12 wherein said connector tube element is spotwelded to both tubes and including means spotwelding one outer end of one of the tubes to the shell, the outer end of the other of said tubes being axially shiftably supported in said shell.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |