US2839151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical filters for the exhaust of internal combustion engines
Assignee: GICHNER Inc
•
Filing: 1953-07-03
•
Granted: 1958-06-17
•
Expires: 1973-07-03
Abstract
No abstract record available.
Inventors
- 👤 Ray V Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:35
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US675830A
Cited
US1292283A
Cited
US1543042A
Cited
US1653934A
Cited
US2490493A
Cited
US2511713A
Cited
US2717048A
Cited
US2706012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |