US3382948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mufflers with side branch tuning chambers
Assignee: Walker Manufacturing Co
•
Filing: 1965-10-13
•
Granted: 1968-05-14
•
Expires: 1985-10-13
Abstract
No abstract record available.
Inventors
- 👤 John C Walker
- 👤 Paul F Jettinghoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:07
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/02; F01N1/00; F01N1/003; F01N1/006; F01N1/02; F01N1/023; F01N2490/00; F01N2490/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2332543A
Cited
US2043030A
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US2176615A
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US2297046A
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US2277132A
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US2580564A
Cited
GB742529A
Cited
US2936041A
Cited
US3036654A
Cited
US2930440A
Cited
FR1351921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |