Patent US3361257A successfully refreshed from Google Patents.
US3361257A
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Phosphate flotation
Assignee: Armour Agricultural Chemical Co
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Filing: 1964-10-14
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Granted: 1968-01-02
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Expires: 1984-10-14
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Haseman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:40
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D1/006; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS FOR THE RECOVERY OF PHOSPHATE VALUES FROM PHOSPHATE ORES CONTAINING SILICA ACTIVATED BY ADSORBED POLYVALENT CATIONS, IN WHICH PROCESS AIR FLOTATION IN AN AQUEOUS SYSTEM IS EFFECTED WITH FATTY ACID AND FUEL OIL, THE STEPS OF ADDING TO THE PHOSPHATE ORE AND SILICA FEED WITH SAID FATTY ACID AND FUEL OIL ABOUT 0.6-2.5 POUNDS OF SODIUM FLUORIDE PER TON OF FEED AT A PH OF ABOUT 7.69.6 TO REMOVE SAID ADSORBED POLYVALENT CATIONS ON SAID SILICA, AND INTRODUCING AIR FOR FLOATING SAID PHOSPHATE FROM SAID SILICA.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR THE RECOVERY OF PHOSPHATE VALUES FROM PHOSPHATE ORES CONTAINING SILICA ACTIVATED BY ADSORBED POLYVALENT CATIONS, IN WHICH PROCESS AIR FLOTATION IN AN AQUEOUS SYSTEM IS EFFECTED WITH FATTY ACID AND FUEL OIL, THE STEPS OF ADDING TO THE PHOSPHATE ORE AND SILICA FEED WITH SAID FATTY ACID AND FUEL OIL ABOUT 0.6-2.5 POUNDS OF SODIUM FLUORIDE PER TON OF FEED AT A PH OF ABOUT 7.69.6 TO REMOVE SAID ADSORBED POLYVALENT CATIONS ON SAID SILICA, AND INTRODUCING AIR FOR FLOATING SAID PHOSPHATE FROM SAID SILICA.
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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) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |