US2302622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous depth filter having an interior cylindrical retaining wall
Assignee: Individual
•
Filing: 1939-03-31
•
Granted: 1942-11-17
•
Expires: 1959-03-31
Abstract
No abstract record available.
Inventors
- 👤 Fred W Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:51
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/09; B01D29/096; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D29/60; B01D29/605; B01D29/76; B01D29/80; B01D29/82; B01D29/828; B01D29/88; B01D29/90; B01D29/94; B01D2201/00; B01D2201/28; B01D2201/282; B01D2201/287
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) | 1945-11-16 | 1946-05-18 | 1946-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-11-16 | 1950-05-18 | 1950-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-11-16 | 1954-05-18 | 1954-11-17 | $7700.00 | Window Closed / Lapsed |