US2419945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth flotation of silica from iron ore
Assignee: Individual
•
Filing: 1944-12-11
•
Granted: 1947-05-06
•
Expires: 1964-12-11
Abstract
No abstract record available.
Inventors
- 👤 Clemmer Julius Bruce
- 👤 Jr Milton Friel Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:34
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/001; B03D1/004; B03D1/008; B03D1/08; B03D1/085; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2387081A
Cited
US2364777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |