Patent EP0694436B1 successfully refreshed from Google Patents.
US3655010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic conduit with wrinkle section
Assignee: Tenneco Inc
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Filing: 1970-07-17
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Granted: 1972-04-11
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Expires: 1990-07-17
Abstract
Abstract A conduit having an outwardly extending wrinkled wall of approximately a 4 foot length is used in a motor vehicle exhaust system to provide acoustic control and attenuation, the pipe section preferably being located to include an anti-node point of an objectionable frequency and ahead of the muffler.
Inventors
- 👤 Bert Dubois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:59
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N1/00; F01N1/003; F01N1/08; F16; F16L; F16L9/00; F16L9/21; F01N2470/00; F01N2470/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
In an exhaust system for an internal combustion engine having a muffler and gas passage conduits leading to and from the muffler, said system including an objectionable sound frequency, an acoustic control and attenuation element comprising a wrinkle pipe section in one of said conduits with a substantially uniform nominal diameter wall having a multiplicity of outwardly extending annular embossments in the wall spaced closely together along the length of the section, the anti-node of said objectionable sound frequency being located centrally of said wrinkle section.
Claim 2
Dependent Claim
86 words
In an exhaust system for an internal combustion engine having a muffler and gas passage conduits leading to and from the muffler, said system including an objectionable sound frequency, an acoustic control and attenuation element comprising a wrinkle pipe section in one of said conduits with a substantially uniform nominal diameter wall having a multiplicity of outwardly extending annular embossments in the wall spaced closely together along the length of the section, the anti-node of said objectionable sound frequency being located centrally of said wrinkle section.
Claim 3
Dependent Claim
21 words
A system as set forth in claim 1 wherein said wrinkle section is no more than about 4 feet in length.
Claim 4
Dependent Claim
24 words
A system as set forth in claim 1 wherein said wrinkle section is located in the conduit that connects the engine to the muffler.
References Cited (Backward Citations)
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Cited
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US2014368A
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US2718273A
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US3173710A
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |