US2808896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust mufflers for internal combustion engines
Assignee: Individual
•
Filing: 1954-02-01
•
Granted: 1957-10-08
•
Expires: 1974-02-01
Abstract
No abstract record available.
Inventors
- 👤 Wilman Sigismond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:45
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1872; F01N1/00; F01N1/08; F01N1/10; F01N1/12; F01N13/1838; F01N13/1844; F01N13/1855; F01N13/1888; F01N13/1894; F01N1/084; F01N2240/00; F01N2240/20; F01N2310/00; F01N2310/02; F01N2310/04; F01N2450/00; F01N2450/22; F01N2450/24; F01N2470/00; F01N2470/02; F01N2470/04; F01N2470/06; F01N2470/24; F01N2470/30; F01N2490/00; F01N2490/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |