US2666588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation process for separation of silica and rhodonite
Assignee: Individual
•
Filing: 1952-12-15
•
Granted: 1954-01-19
•
Expires: 1972-12-15
Abstract
No abstract record available.
Inventors
- 👤 Carl H Schack
- 👤 Karl C Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:50
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PROCESS FOR THE FROTH FLOTATION OF SILICA FROM RHODONITE COMPRISING ADDING TO A PULP OF RHODONITE-SILICA CONTAINING MATERIAL A FROTHING AGENT, DEXTRINE, AND TRI-SODIUM PHOSPHATE, ADJUSTING THE PH OF THE PULP TO ABOUT 7, AND FLOATING THE SILICA FROM THE RHODONITE BY ADDITION OF A CATIONIC COLLECTING AGENT.
Claim 2
Dependent Claim
49 words
A PROCESS FOR THE FROTH FLOTATION OF SILICA FROM RHODONITE COMPRISING ADDING TO A PULP OF RHODONITE-SILICA CONTAINING MATERIAL A FROTHING AGENT, DEXTRINE, AND TRI-SODIUM PHOSPHATE, ADJUSTING THE PH OF THE PULP TO ABOUT 7, AND FLOATING THE SILICA FROM THE RHODONITE BY ADDITION OF A CATIONIC COLLECTING AGENT.
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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |