US2401121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for constructing filter bottoms
Assignee: BUILDERS IRON FOUNDRY
•
Filing: 1944-12-11
•
Granted: 1946-05-28
•
Expires: 1964-12-11
Abstract
No abstract record available.
Inventors
- 👤 John C Thoresen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:04
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/20; B01D24/24; B01D24/10; B01D24/14; B01D2201/00; B01D2201/04; B01D2201/0415
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) | 1949-05-27 | 1949-11-26 | 1950-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-05-27 | 1953-11-26 | 1954-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-05-27 | 1957-11-26 | 1958-05-28 | $7700.00 | Window Closed / Lapsed |