Patent US1487759A successfully refreshed from Google Patents.
Patent US2725948A successfully refreshed from Google Patents.
US2725948A
Expired / Lapsed
US
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Vertical muffler for internal combustion engine
Assignee: Individual
•
Filing: 1951-05-14
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Granted: 1955-12-06
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Expires: 1971-05-14
Abstract
No abstract record available.
Inventors
- 👤 Charles I Keene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:59
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N1/00; F01N1/14; F01N3/05; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |