US3148000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution mining of potassium chloride
Assignee: PPG Industries Inc
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Filing: 1962-02-28
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Granted: 1964-09-08
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Expires: 1982-02-28
Abstract
No abstract record available.
Inventors
- 👤 Dahms James Bowen
- 👤 Byron P Edmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:17
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/28; C; C01; C01D; C01D3/00; C01D3/04; C01D3/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
146 words
IN THE METHOD OF RECOVERING POTASSIUM CHLORIDE FROM A WATER-SOLUBLE SUBTERRANEAN STRATUM CONTAINING POTASSIUM CHLORIDE AND SODIUM CHLORIDE BY ESTABLISHING A CAVITY IN THE STRATUM AND FEEDING WATER TO THE CAVITY TO DISSOLVE POTASSIUM CHLORIDE FROM THE STRATUM THEREBY FORMING A POTASSIUM CHLORIDE-RICH SOLUTION WHICH IS WITHDRAWN FROM THE CAVITY, THE IMPROVEMENT WHICH COMPRISES INCREASING THE RATE OF RECOVERY OF POTASSIUM CHLORIDE FROM THE CAVITY BY ALTERNATELY REDUCING THE WATER PRESSURE IN THE CAVITY SUFFICIENTLY TO CAUSE COLLAPSE OF THE CAVITY ROOF AND INCREASING THE WATER PRESSURE WITHIN THE CAVITY TO PREVENT FURTHER COLLAPSE OF THE CAVITY FOOR UNTIL THERE IS OBTAINED A SUBSTANTIALLY INCREASED CONCENTRATION OF POTASSIUM CHLORIDE IN THE BRINE REMOVED FROM THE CAVITY, AND THEN FEEDING WATER INTO THE CAVITY AT INCREASED PRESSURE TO EXTRACT POTASSIUM CHLORIDE TO OBTAIN A SUBSTANTIALLY INCREASED CONCENTRATION OF POTASSIUM CHLORIDE IN THE BRINE REMOVED FROM THE CAVITY.
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) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |