Patent US2849121A successfully refreshed from Google Patents.
US2849121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure filter
Assignee: Individual
•
Filing: 1954-09-22
•
Granted: 1958-08-26
•
Expires: 1974-09-22
Abstract
No abstract record available.
Inventors
- 👤 Burwell Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:53
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/12; B01D25/164; B01D25/172; B01D25/28; B01D25/282; B01D25/284; B01D25/32; B01D25/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US564422A
Cited
US900184A
Cited
GB123589A
Cited
US1415611A
Cited
GB393174A
Cited
US2226920A
Cited
US2431943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |