Patent US5226178A successfully refreshed from Google Patents.
Patent US3231340A successfully refreshed from Google Patents.
US3231340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of potassium halides from brine
Assignee: Dow Chemical Co
•
Filing: 1963-07-22
•
Granted: 1966-01-25
•
Expires: 1983-07-22
Abstract
No abstract record available.
Inventors
- 👤 Remigius A Gaska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:35
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/14; C01D3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A METHOD OF SEPARATING POTASSIUM HALIDES FROM AN AQUEOUS SOLUTION THEREOF CONTAINING POTASSIUM HALIDES AND AT LEAST ONE OF THE CHLORIDES OF THE GROUP CONSISTING OF CALCIUM CHLORIDE AND MAGNESIUM CHLORIDE WHICH COMPRISES ADMIXING A LOW MOLECULAR WEIGHT, POLAR, LEWIS BASE-TYPE SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, ACETONE AND ETHYLENE GLYCOL IN AN AMOUNT SUFFICIENT TO PROVIDE A CONCENTRATION OF 10-50 PERCENT BY WEIGHT OF THE FINAL MIXTURE, SAID SOLVENT BEING AT LEAST PARTIALLY MISCIBLE WITH SAID AQUEOUS SOLUTION, THEREBY TO PRECIPITATE THE POTASSIUM HALIDES AND SEPARATING THE POTASSIUM HALIDES SO PRECIPITATED FROM SAID SOLUTION.
Claim 2
Independent Claim
98 words
A METHOD OF SEPARATING POTASSIUM HALIDES FROM AN AQUEOUS SOLUTION THEREOF CONTAINING POTASSIUM HALIDES AND AT LEAST ONE OF THE CHLORIDES OF THE GROUP CONSISTING OF CALCIUM CHLORIDE AND MAGNESIUM CHLORIDE WHICH COMPRISES ADMIXING A LOW MOLECULAR WEIGHT, POLAR, LEWIS BASE-TYPE SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, ACETONE AND ETHYLENE GLYCOL IN AN AMOUNT SUFFICIENT TO PROVIDE A CONCENTRATION OF 10-50 PERCENT BY WEIGHT OF THE FINAL MIXTURE, SAID SOLVENT BEING AT LEAST PARTIALLY MISCIBLE WITH SAID AQUEOUS SOLUTION, THEREBY TO PRECIPITATE THE POTASSIUM HALIDES AND SEPARATING THE POTASSIUM HALIDES SO PRECIPITATED FROM SAID SOLUTION.
References Cited (Backward Citations)
DE260141C
Cited
US1232156A
Cited
GB255042A
Cited
GB316548A
Cited
US1774040A
Cited
GB331236A
Cited
US2002797A
Cited
GB727271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |