US2634821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined inertial air cleaner and filter
Assignee: Burgess-Manning Co
•
Filing: 1947-08-15
•
Granted: 1953-04-14
•
Expires: 1967-08-15
Abstract
No abstract record available.
Inventors
- 👤 Alfred S Chipley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:05
CPC Classifications
B; B01; B01D; B01D50/00; B01D50/20; B01D46/00; B01D46/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US485915A
Cited
DE380916C
Cited
FR335117A
Cited
US1405399A
Cited
US1774301A
Cited
US2289474A
Cited
US2319894A
Cited
US2407194A
Cited
US2474017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |