US3209859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-piece muffler comprising external shell and concentric deformed inner tube
Assignee: Walker Manufacturing Co
•
Filing: 1964-06-16
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Granted: 1965-10-05
•
Expires: 1984-06-16
Abstract
No abstract record available.
Inventors
- 👤 Ervin C Lentz
- 👤 Karl K Kerns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:16
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1838; F01N13/1844; F01N1/00; F01N1/08; F01N2450/00; F01N2450/20; F01N2470/00; F01N2470/02; F01N2470/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US577852A
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US1318210A
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GB190825897A
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GB280719A
Cited
US1949074A
Cited
US2115128A
Cited
US2416452A
Cited
US2548965A
Cited
US2962110A
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US3009530A
Cited
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 |