US2793934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of high purity lithium carbonate from crude aqueous lithium chloride
Assignee: Chempatents Inc
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Filing: 1952-12-06
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Granted: 1957-05-28
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Expires: 1972-12-06
Abstract
No abstract record available.
Inventors
- 👤 George L Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:55
CPC Classifications
C; C01; C01D; C01D15/00; C01D15/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN A CYCLIC PROCESS THE COMBINATION OF STEPS OF ROASTING A LITHIUM ORE WITH CALCIUM CARBONATE AND CALCIUM CHLORIDE AT A TEMPERATUE OF ABOUT 1100 TO 1200*C. TO EVOLVE LITHIUM CONTAINING GASEOUS MATERIALS, FORMING AN AQUEOUS SOLUTION OF TEH WATER-SOLUBLE CONSTITUENTS OF THE EVOLVED GASEOUS MATERIALS, TREATING SAID AQUEOUS SOLUTION WITH SODIUM CARBONATE, HEATING EH RESULTANT SOLUTION AT 60 TO 100*C. AND SEPARATING HIGH PURITY LITHIUM CARBONATE THEREFROM, EVAPORATING THE REMAINING SOLUTION TO APPROXIMATELY 40 TO 65% TOTAL SOLIDS, SEPARATING THEREFROM AT ABOUT 90 TO 100*C. CRUDE SOLID SODIUM CHLORIDE CONTIANING LITHIUM CARBONATE, RECYCLING SAID CRUDE SOLID SODIUM CHLORIDE TO THE SAID AQUEOUS SOLUTION, COOLING THE LIQUOR FROM WHICH THE CRUDE SOLID SODIUM CHLORIDE HAS BEEEN SEPARATED AT A TEMPERATURE OF ABOUT
Claim 2
Dependent Claim
122 words
IN A CYCLIC PROCESS THE COMBINATION OF STEPS OF ROASTING A LITHIUM ORE WITH CALCIUM CARBONATE AND CALCIUM CHLORIDE AT A TEMPERATUE OF ABOUT 1100 TO 1200*C. TO EVOLVE LITHIUM CONTAINING GASEOUS MATERIALS, FORMING AN AQUEOUS SOLUTION OF TEH WATER-SOLUBLE CONSTITUENTS OF THE EVOLVED GASEOUS MATERIALS, TREATING SAID AQUEOUS SOLUTION WITH SODIUM CARBONATE, HEATING EH RESULTANT SOLUTION AT 60 TO 100*C. AND SEPARATING HIGH PURITY LITHIUM CARBONATE THEREFROM, EVAPORATING THE REMAINING SOLUTION TO APPROXIMATELY 40 TO 65% TOTAL SOLIDS, SEPARATING THEREFROM AT ABOUT 90 TO 100*C. CRUDE SOLID SODIUM CHLORIDE CONTIANING LITHIUM CARBONATE, RECYCLING SAID CRUDE SOLID SODIUM CHLORIDE TO THE SAID AQUEOUS SOLUTION, COOLING THE LIQUOR FROM WHICH THE CRUDE SOLID SODIUM CHLORIDE HAS BEEEN SEPARATED AT A TEMPERATURE OF ABOUT
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) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |