US2902343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of hydrous potassium magnesium sulfate from kainite containing sodium chloride
Assignee: SINCAT INDUSTRIALE CATANESE SpA Soc
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Filing: 1957-03-06
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Granted: 1959-09-01
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Expires: 1977-03-06
Abstract
No abstract record available.
Inventors
- 👤 Saccardo Pietro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:13
CPC Classifications
C; C01; C01D; C01D5/00; C01D5/12; C01F; C01F5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE PROCESS OF OBTAINING SUBSTANTIALLY PURE POTASSIUM-MAGNESIUM SULPHATE FROM KAINITE CONTAINING APPRECIABLE QUANTITIES OF NACI AS AN IMPURITY COMPRISING THE STEPS OF REACTING THE IMPURE KAINITE UNDER CONDITIONS OF VIGOROUS AGITATION WITH A QUANTITY OF WATER SUFFICIENT TO CONVERT THE KAINITE INTO A THICK AQUEOUS SUSPENSION OF FINELY DIVIDED POTASSIUM-MAGNESIUM SULPHATE AND FUR THER, AT LEAST SUFFICIENT TO DISSOLVE THE MGCI2 PRODUCED UNDER SAID REACTION CONDITIONS, BUT INSUFFICIENT TO SUBSTANTIALLY DISSOLVE THE AFORESAID NACI, ADDING AN INERT AQUEOUS SEPARATING LIQUID TO REDUCE THE DENSITY OF THE SAID THICK SUSPENSION OF FINELY DIVIDED POTASSIUM-MAGNESIUM SULPHATE, AND THEN SEPARATING THE SAID FINELY DIVIDED POTASSIUM-MAGNESIUM SULPHATE FROM THE UNDISSOLVED ORGINAL RELATIVELY COARSE NACI CRYSTALS.
Claim 2
Dependent Claim
111 words
THE PROCESS OF OBTAINING SUBSTANTIALLY PURE POTASSIUM-MAGNESIUM SULPHATE FROM KAINITE CONTAINING APPRECIABLE QUANTITIES OF NACI AS AN IMPURITY COMPRISING THE STEPS OF REACTING THE IMPURE KAINITE UNDER CONDITIONS OF VIGOROUS AGITATION WITH A QUANTITY OF WATER SUFFICIENT TO CONVERT THE KAINITE INTO A THICK AQUEOUS SUSPENSION OF FINELY DIVIDED POTASSIUM-MAGNESIUM SULPHATE AND FUR THER, AT LEAST SUFFICIENT TO DISSOLVE THE MGCI2 PRODUCED UNDER SAID REACTION CONDITIONS, BUT INSUFFICIENT TO SUBSTANTIALLY DISSOLVE THE AFORESAID NACI, ADDING AN INERT AQUEOUS SEPARATING LIQUID TO REDUCE THE DENSITY OF THE SAID THICK SUSPENSION OF FINELY DIVIDED POTASSIUM-MAGNESIUM SULPHATE, AND THEN SEPARATING THE SAID FINELY DIVIDED POTASSIUM-MAGNESIUM SULPHATE FROM THE UNDISSOLVED ORGINAL RELATIVELY COARSE NACI CRYSTALS.
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) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |