US2921686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filtering apparatus with removable filter holder
Assignee: ALPHA TANK Co Inc
•
Filing: 1956-12-03
•
Granted: 1960-01-19
•
Expires: 1976-12-03
Abstract
No abstract record available.
Inventors
- 👤 Forman Milton
- 👤 Howard D Urdanoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:17
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/16; B01D29/00; B01D29/11; B01D29/114; B01D29/50; B01D29/52; B01D29/60; B01D29/606; B01D29/88; B01D29/90; B01D29/902; B01D29/96; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0453; B01D2201/28; B01D2201/287
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US385333A
Cited
US468604A
Cited
US602304A
Cited
US654592A
Cited
US1172689A
Cited
US1905738A
Cited
US2301430A
Cited
US2374976A
Cited
US2440487A
Cited
US2609933A
Cited
US2548400A
Cited
US2657808A
Cited
US2693882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |