US2809093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of potassium sulfate from langbeinite
Assignee: International Minerals and Chemical Corp
•
Filing: 1955-05-03
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Granted: 1957-10-08
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Expires: 1975-05-03
Abstract
No abstract record available.
Inventors
- 👤 William B Dancy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:50
CPC Classifications
C; C01; C01D; C01D5/00; C01D5/06; C01D5/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR RECOVERING POTASH VALUES FROM LANGBEINITE ORE WHICH COMPRISES REACTING LANGBEINITE WITH A POTASSIUM SULFATE MOTHER LIQUOR AT A TEMPERATURE BETWEEN ABOUT 35*C. AND ABOUT 75*C. UNTIL THE REACTION REACHES SUBSTANTIAL EQUILIBRIUM, WHEREBY A SOLID PHASE IS OBTAINED CONSISTING ESSENTIALLY OF A HYDRATE OF
Claim 2
Dependent Claim
46 words
A PROCESS FOR RECOVERING POTASH VALUES FROM LANGBEINITE ORE WHICH COMPRISES REACTING LANGBEINITE WITH A POTASSIUM SULFATE MOTHER LIQUOR AT A TEMPERATURE BETWEEN ABOUT 35*C. AND ABOUT 75*C. UNTIL THE REACTION REACHES SUBSTANTIAL EQUILIBRIUM, WHEREBY A SOLID PHASE IS OBTAINED CONSISTING ESSENTIALLY OF A HYDRATE OF
References Cited (Backward Citations)
US1939174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |