Patent US2661072A successfully refreshed from Google Patents.
US2661072A
Expired / Lapsed
US
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Air-cooled exhaust muffler with sound absorbing panels
Assignee: C W LEMMERMAN Inc
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Filing: 1950-11-14
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Granted: 1953-12-01
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Expires: 1970-11-14
Abstract
No abstract record available.
Inventors
- 👤 Carl W Lemmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:08
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US792804A
Cited
US1584315A
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US1605484A
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US2050581A
Cited
US2169658A
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US2363236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |