US2184243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for purifying liquids or gases
Assignee: FLEXOFILTRATION Ltd
•
Filing: 1936-12-28
•
Granted: 1939-12-19
•
Expires: 1956-12-28
Abstract
No abstract record available.
Inventors
- 👤 Belyavin Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:20
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46; B01D35/00; B01D35/06; B01D35/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1942-12-18 | 1943-06-19 | 1943-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-12-18 | 1947-06-19 | 1947-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-12-18 | 1951-06-19 | 1951-12-19 | $7700.00 | Window Closed / Lapsed |