US1434089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the countercurrent washing of finely-divided solids
Assignee: Individual
•
Filing: 1920-12-13
•
Granted: 1922-10-31
•
Expires: 1940-12-13
Abstract
No abstract record available.
Inventors
- 👤 Niels C Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:25
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/02; B; B01; B01D; B01D11/00; B01D11/02; B01D11/0215; B01D11/0223; B01D11/0238; B01D11/028; B01D11/0284; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1925-10-30 | 1926-05-01 | 1926-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-10-30 | 1930-05-01 | 1930-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-10-30 | 1934-05-01 | 1934-10-31 | $7700.00 | Window Closed / Lapsed |