US2923408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation process
Assignee: Dow Chemical Co
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Filing: 1954-12-27
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Granted: 1960-02-02
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Expires: 1974-12-27
Abstract
No abstract record available.
Inventors
- 👤 Carl F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:05
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; B03D1/01; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN THE PREPARATION OF SYLVINITE ORE FOR THE RECOVERY OF POTASSIUM CHLORIDE BY FLOTATION, THE METHOD WHICH COMPRISES THE STEPS OF SUSPENDING GROUND SYLVINITE ORE IN BRINE SATURATED WITH RESPECT TO SAID ORE TO FORM A PULP, CONDITIONING SAID PULP WITH A FROTHER AND WITH A WATER-SOLUBLE ACRYLAMIDE POYMER CHARACTERIZED BY A VISCOSITY OF FROM 1.8 TO 80 CENTIPOSES FOR A 0.5 PERCENT BY WEIGHT SOLUTION THEREOF IN DISTILLED WATER ADJUSTED TO A PH OF 3 TO 3.5 AND AT A TEMPERATURE OF 21.5*C., SUBJECTING THE CONDITIONED PULP TO FROTH FLOTATION AND SEPARATING CLAY THEREFROM AS A FLOTATED CONCENTRATE, THE POLYMER EMPOLYED BEING SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF ACRYLAMIDE AND COPOLYMERS OF ACRYLAMIDE WITH UP TO 15 MOLE PERCENT OF ACRYLIC ACID.
Claim 2
Dependent Claim
125 words
IN THE PREPARATION OF SYLVINITE ORE FOR THE RECOVERY OF POTASSIUM CHLORIDE BY FLOTATION, THE METHOD WHICH COMPRISES THE STEPS OF SUSPENDING GROUND SYLVINITE ORE IN BRINE SATURATED WITH RESPECT TO SAID ORE TO FORM A PULP, CONDITIONING SAID PULP WITH A FROTHER AND WITH A WATER-SOLUBLE ACRYLAMIDE POYMER CHARACTERIZED BY A VISCOSITY OF FROM 1.8 TO 80 CENTIPOSES FOR A 0.5 PERCENT BY WEIGHT SOLUTION THEREOF IN DISTILLED WATER ADJUSTED TO A PH OF 3 TO 3.5 AND AT A TEMPERATURE OF 21.5*C., SUBJECTING THE CONDITIONED PULP TO FROTH FLOTATION AND SEPARATING CLAY THEREFROM AS A FLOTATED CONCENTRATE, THE POLYMER EMPOLYED BEING SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF ACRYLAMIDE AND COPOLYMERS OF ACRYLAMIDE WITH UP TO 15 MOLE PERCENT OF ACRYLIC ACID.
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) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |