Patent US2952331A successfully refreshed from Google Patents.
US2952331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering apparatus for exhaust pumps
Assignee: Beach Russ Co
•
Filing: 1959-04-20
•
Granted: 1960-09-13
•
Expires: 1979-04-20
Abstract
No abstract record available.
Inventors
- 👤 Edward J Beach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:35
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D37/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US406603A
Cited
US1677804A
Cited
US1892982A
Cited
US2144681A
Cited
US2822059A
Cited
US2886122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |