US2608465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing lithium sulfate from lithium phosphates
Assignee: American Potash and Chemical Corp
•
Filing: 1946-10-28
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Granted: 1952-08-26
•
Expires: 1966-10-28
Abstract
No abstract record available.
Inventors
- 👤 May Frank Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:27
CPC Classifications
C; C01; C01D; C01D15/00; C01D15/06; Y; Y10; Y10S; Y10S159/00; Y10S159/19; Y10S159/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A PROCESS FOR PRODUCING A LITHIUM SULFATE AND PHOSPHORIC ACID FROM A LITHIUM-PHOSPHATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF LITHIUM PHOSPHATES, LITHIUM-SODIUM PHOSPATES AND MIXTURES OF LITHIUM PHOSPHATES AND LITHIUMSODIUM PHOSPHATES, WHICH PROCESS COMPRISES, REACTING THE LITHIUM PHOSPHATE MATERIAL WITH SULFURIC ACID IN THE PRESENCE OF WATER TO FORM A SOLUTION CONTAINING LITHIUM SULFATE AND PHOSPHORIC ACID, PARTIALLY EVAPORATING SAID SOLUTION WHILE CRYSTALLIZING LITHIUM SULFATE FROM THE PRODUCED SOLUTION AND FORMING A PHOSPHORIC ACID SOLUTION, AND SEPARATING THE CRYSTALLIZED LITHIUM SULPHATE FROM THE PRODUCED PHOSPHORIC ACID SOLUTION, THE EVAPORATION OF SUCH SOLUTION BEING CARRIED OUT IN TWO STAGES, FROM EACH OF WHICH THE CRYSTALLIZED LITHIUM SULFATE IS SEPARATED, THE CRYSTALLIZED LITHIUM SULFATE FROM THE SECOND STAGE OF EVAPORATION BEING RETURNED TO THE SOLUTION UNDERGOING EVAPORATION IN THE FIRST EVAPORATION STAGE.
Claim 2
Dependent Claim
131 words
A PROCESS FOR PRODUCING A LITHIUM SULFATE AND PHOSPHORIC ACID FROM A LITHIUM-PHOSPHATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF LITHIUM PHOSPHATES, LITHIUM-SODIUM PHOSPATES AND MIXTURES OF LITHIUM PHOSPHATES AND LITHIUMSODIUM PHOSPHATES, WHICH PROCESS COMPRISES, REACTING THE LITHIUM PHOSPHATE MATERIAL WITH SULFURIC ACID IN THE PRESENCE OF WATER TO FORM A SOLUTION CONTAINING LITHIUM SULFATE AND PHOSPHORIC ACID, PARTIALLY EVAPORATING SAID SOLUTION WHILE CRYSTALLIZING LITHIUM SULFATE FROM THE PRODUCED SOLUTION AND FORMING A PHOSPHORIC ACID SOLUTION, AND SEPARATING THE CRYSTALLIZED LITHIUM SULPHATE FROM THE PRODUCED PHOSPHORIC ACID SOLUTION, THE EVAPORATION OF SUCH SOLUTION BEING CARRIED OUT IN TWO STAGES, FROM EACH OF WHICH THE CRYSTALLIZED LITHIUM SULFATE IS SEPARATED, THE CRYSTALLIZED LITHIUM SULFATE FROM THE SECOND STAGE OF EVAPORATION BEING RETURNED TO THE SOLUTION UNDERGOING EVAPORATION IN THE FIRST EVAPORATION STAGE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-26 | 1956-02-25 | 1956-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-26 | 1960-02-25 | 1960-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-26 | 1964-02-25 | 1964-08-26 | $7700.00 | Window Closed / Lapsed |