US2703646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beneficiation of potash ores and the like
Assignee: POTASH Co
•
Filing: 1951-01-11
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Granted: 1955-03-08
•
Expires: 1971-01-11
Abstract
No abstract record available.
Inventors
- 👤 Edmund A Schoeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:33
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
IN A PROCESS FOR EXTRACTING IMPURITIES FROM POTASH ORES SUCH AS SYLVINITE IN WHICH THE GROUND ORE IS SUSPENDED IN A CIRCULATING BRINE SATURATED WITH RESPECT TO THE SOLUBLE ORE COMPONENTS AND SUBJECTED TO FROTH FLOTATION IN THE PRESENCE OF A COLLECTOR REAGENT ADAPTED FOR COLLECTING THE IMPURITIES IN THE FROTH, SAID BRINE CONTAINING LEAD IONS, THE IMPROVEMENT WHICH COMPRISES ADDING ACIDIC MATERIAL TO THE BRINE IN QUANTITIES SUFFICIENT TO MAINTAIN THE PH VALUE OF THE BRINE BETWEEN 6.5 AND 7.5 DURING FLOTATION, WHEREBY TO REDUCE THE TENDENCY OF LEADING IN SOLUTION TO PRECIPITATE.
References Cited (Backward Citations)
US1488745A
Cited
US2275138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-07 | 1958-09-06 | 1959-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-07 | 1962-09-06 | 1963-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-07 | 1966-09-06 | 1967-03-08 | $7700.00 | Window Closed / Lapsed |