Patent US2927692A successfully refreshed from Google Patents.
US2927692A
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US
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Concentration of minerals
Assignee: SMITH DOUGLASS CO Inc
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Filing: 1955-12-12
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Granted: 1960-03-08
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Expires: 1975-12-12
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
- 👤 Karl F Schilling
- 👤 Jordan L Wester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:36
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; B03D1/008; B03D1/01; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/06; Y; Y10; Y10S; Y10S209/00; Y10S209/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
THE METHOD OF SEPARATING SILICA FROM A MIXTURE OF PHOSPHATIC MATERIAL AND SILICA, WHICH COMPRISES SUBJECTING THE PHOSPHATE-SILICA MIXTURE TO A FLOATATION OPERATION AT A PH WITHIN THE RANGE OF 6 TO 9 AND IN THE PRESENCE OF THE WATER-INSOLUBLE POLYMERIZATION CONDENSATION REACTION PRODUCT RESULTING FROM REACTING AT A TEMPERATURE WITHIN THE RANGE OF 300 TO 425*F. ONE MOLECULAR EQUIVALENT OF A POLYALKYLENE POLYAMINE WITH FROM 2.5 TO 18 MOLECULAR EQUIVALENTS OF A CRUDE FATTY PRODUCT SELECTED FROM THE GROUP CONSISTING OF TALL OIL AND TALL OIL PITCH AND RECOVERING A PHOSPHATE CONCENTRATE IN THE UNDERFLOW OF THE FLOTATION OPERATION WHILE FLOATING OFF SILICA.
Claim 2
Independent Claim
104 words
THE METHOD OF SEPARATING SILICA FROM A MIXTURE OF PHOSPHATIC MATERIAL AND SILICA, WHICH COMPRISES SUBJECTING THE PHOSPHATE-SILICA MIXTURE TO A FLOATATION OPERATION AT A PH WITHIN THE RANGE OF 6 TO 9 AND IN THE PRESENCE OF THE WATER-INSOLUBLE POLYMERIZATION CONDENSATION REACTION PRODUCT RESULTING FROM REACTING AT A TEMPERATURE WITHIN THE RANGE OF 300 TO 425*F. ONE MOLECULAR EQUIVALENT OF A POLYALKYLENE POLYAMINE WITH FROM 2.5 TO 18 MOLECULAR EQUIVALENTS OF A CRUDE FATTY PRODUCT SELECTED FROM THE GROUP CONSISTING OF TALL OIL AND TALL OIL PITCH AND RECOVERING A PHOSPHATE CONCENTRATE IN THE UNDERFLOW OF THE FLOTATION OPERATION WHILE FLOATING OFF SILICA.
References Cited (Backward Citations)
US2278060A
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US2368968A
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US2494132A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |