US2651381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust muffler with conical perforated baffles
Assignee: Individual
•
Filing: 1951-09-24
•
Granted: 1953-09-08
•
Expires: 1971-09-24
Abstract
No abstract record available.
Inventors
- 👤 Richard W Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:49
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1111265A
Cited
US1286365A
Cited
US1474115A
Cited
FR646808A
Cited
GB366257A
Cited
DE655774C
Cited
US2122086A
Cited
US2575233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |