US3209858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler having depressed channel forming tuning passages
Assignee: Walker Manufacturing Co
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Filing: 1963-06-25
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Granted: 1965-10-05
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Expires: 1983-06-25
Abstract
No abstract record available.
Inventors
- 👤 Paul F Jettinghoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:06
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/003; F01N1/006; F01N1/02; F01N1/023; F01N1/026; F01N1/08; F01N1/084; F01N2490/00; F01N2490/15; F01N2490/155; F01N2490/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
IN A MUFFLER HAVING A SHELL, A GAS FLOW PASSAGE EXTENDING THROUGH SAID SHELL, SAID SHELL AND SAID GAS FLOW PASSAGE FORMING A CHAMBER THEREBETWEEN, TUBULAR MEANS OPEN AT ONE END TO SAID GAS FLOW PASSAGE AND AT ITS OTHER END TO SAID CHAMBER AND FORMING THE ONLY INLET AND OUTLET TO SAID CHAMBER, THE LENGTH OF SAID TUBULAR MEANS AND THE VOLUME OF SAID CHAMBER BEING SELECTED TO TUNE THE CHAMBER TO SILENCE A PREDETERMINED FREQUENCY, SAID TUBULAR MEANS HAVING A WALL PROVIDED WITH A PLURALITY OF PERFORATIONS ALONG ITS LENGTH TO BROAD THE ATTENUATION OF SAID CHAMBER.
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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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |