US3370673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust system with serially-connected mufflers
Assignee: Walker Manufacturing Co
•
Filing: 1967-04-18
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Granted: 1968-02-27
•
Expires: 1987-04-18
Abstract
No abstract record available.
Inventors
- 👤 Paul F Jettinghoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:00
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/02; F01N1/00; F01N1/02; F01N2490/00; F01N2490/15; F01N2490/155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB341156A
Cited
US2111537A
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US2043030A
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FR854651A
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US2297046A
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US2367753A
Cited
FR1060334A
Cited
US3036654A
Cited
GB892780A
Cited
US3219142A
Cited
FR1351921A
Cited
US3196976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |