Patent US2053628A successfully refreshed from Google Patents.
US2053628A
Expired / Lapsed
US
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Improved filtering apparatus and method
Assignee: Individual
•
Filing: 1933-12-09
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Granted: 1936-09-08
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Expires: 1953-12-09
Abstract
No abstract record available.
Inventors
- 👤 Paterson William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:37
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/46; B01D24/4631; B01D24/02; B01D24/20; B01D24/22; B01D24/38; B01D2201/00; B01D2201/20; B01D2201/204; B01D2201/206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-09-08 | 1940-03-09 | 1940-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-09-08 | 1944-03-09 | 1944-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-09-08 | 1948-03-09 | 1948-09-08 | $7700.00 | Window Closed / Lapsed |