US3292787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphate flotation process
Assignee: WR Grace and Co
•
Filing: 1964-01-09
•
Granted: 1966-12-20
•
Expires: 1984-01-09
Abstract
No abstract record available.
Inventors
- 👤 Maurice C Fuerstenau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:15
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A PROCESS FOR THE BENEFICATION OF PHOSPHATE ORES COMPRISING THE STEPS OF CONDITIONING FOR AT LEAST ABOUT 2.5 MINUTES AND AQUEOUS SLURRY OF THE PHOSPHATE OR HAVING A SOLIDS CONTENT OF FROM ABOUT 71 TO 76 PERCENT SOLIDS AND HAVING A PH IN THE RANGE OF ABOUT FROM 6 TO 10 WITH FLOTATION AGENTS COMPRISING AN ALKALI METAL SALTS OF A HYDROCARBON AROMATIC SULFONIC ACID HAVING A MOLECULAR WEIGHT ABOVE 380 AND BELOW ABOUT 600 IN AN AMOUNT EQUIVALENT TO THE ADDITION OF 0.025 TO 0.80 LB. OF NASO3 PER TON OF ORE AND A HYDROCARBON OIL HAVING A VISCOSITY OF FROM 200 TO 10,000 SEC. SAYBOLT MEASURED AT 100*F. IN AN AMOUNT OF FROM ABOUT 0.1 TO 5.0 LB PER TON OF ORE, AND SEPARATING THE SLURRY BY FROTH FLOTATION.
Claim 2
Dependent Claim
131 words
A PROCESS FOR THE BENEFICATION OF PHOSPHATE ORES COMPRISING THE STEPS OF CONDITIONING FOR AT LEAST ABOUT 2.5 MINUTES AND AQUEOUS SLURRY OF THE PHOSPHATE OR HAVING A SOLIDS CONTENT OF FROM ABOUT 71 TO 76 PERCENT SOLIDS AND HAVING A PH IN THE RANGE OF ABOUT FROM 6 TO 10 WITH FLOTATION AGENTS COMPRISING AN ALKALI METAL SALTS OF A HYDROCARBON AROMATIC SULFONIC ACID HAVING A MOLECULAR WEIGHT ABOVE 380 AND BELOW ABOUT 600 IN AN AMOUNT EQUIVALENT TO THE ADDITION OF 0.025 TO 0.80 LB. OF NASO3 PER TON OF ORE AND A HYDROCARBON OIL HAVING A VISCOSITY OF FROM 200 TO 10,000 SEC. SAYBOLT MEASURED AT 100*F. IN AN AMOUNT OF FROM ABOUT 0.1 TO 5.0 LB PER TON OF ORE, AND SEPARATING THE SLURRY BY FROTH FLOTATION.
References Cited (Backward Citations)
US2433258A
Cited
US2564367A
Cited
US2596407A
Cited
US2753997A
Cited
US2937183A
Cited
US2834463A
Cited
US3016143A
Cited
US3164549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |