US2323920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for dewatering comminuted materials
Assignee: Porcelain Enamel & Manufacturing Co
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Filing: 1939-09-30
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Granted: 1943-07-13
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Expires: 1959-09-30
Abstract
No abstract record available.
Inventors
- 👤 Frederick K Knudsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:08
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/29; B01D33/327
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) | 1946-07-12 | 1947-01-11 | 1947-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-07-12 | 1951-01-11 | 1951-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-07-12 | 1955-01-11 | 1955-07-13 | $7700.00 | Window Closed / Lapsed |