US1979991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming, compacting, and discharging filter cake
Assignee: Nordberg Manufacturing Co
•
Filing: 1931-09-19
•
Granted: 1934-11-06
•
Expires: 1951-09-19
Abstract
No abstract record available.
Inventors
- 👤 Harry W Newton
- 👤 Robert S Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:23
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/44; B01D33/15; B01D33/21; B01D33/23; B01D35/00; B01D35/20
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) | 1937-11-05 | 1938-05-07 | 1938-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-11-05 | 1942-05-07 | 1942-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-11-05 | 1946-05-07 | 1946-11-06 | $7700.00 | Window Closed / Lapsed |