US2702121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of froth-flotation
Assignee: Public Ets
•
Filing: 1951-01-11
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Granted: 1955-02-15
•
Expires: 1971-01-11
Abstract
No abstract record available.
Inventors
- 👤 Colin Jules
- 👤 Berthon Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:11
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
METHOD OF SEPARATING KCL FROM SYLVINITE ORE CONTAINING KCL, NACL AND ISOLUBLES, WHICH COMPRISES SUBJECTING SAID ORE TO FROTH-FLOTATION IN A SOLUTION SATURATED WITH KCL AND NACL AND A FUTHER WATER-SOLUBLE SALT OF LOWER COMMERCIAL VALUE, THE LAST SALT BEING ADDED DURING THE PREPARATION OF THE SOLUTION, THE AMOUNT OF SAID SALT USED TO PRODUCE THIS SATURATED SOLUTION BEING SUBSTANTIAL WHEREBY THE AMOUNT OF KCL REMAINING IN THE TAILINGS IS SUBSTANTIALLY REDUCED.
Claim 2
Dependent Claim
72 words
METHOD OF SEPARATING KCL FROM SYLVINITE ORE CONTAINING KCL, NACL AND ISOLUBLES, WHICH COMPRISES SUBJECTING SAID ORE TO FROTH-FLOTATION IN A SOLUTION SATURATED WITH KCL AND NACL AND A FUTHER WATER-SOLUBLE SALT OF LOWER COMMERCIAL VALUE, THE LAST SALT BEING ADDED DURING THE PREPARATION OF THE SOLUTION, THE AMOUNT OF SAID SALT USED TO PRODUCE THIS SATURATED SOLUTION BEING SUBSTANTIAL WHEREBY THE AMOUNT OF KCL REMAINING IN THE TAILINGS IS SUBSTANTIALLY REDUCED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |