Patent US2993752A successfully refreshed from Google Patents.
US2993752A
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Thorium recovery process
Assignee: DALLAS B LEWIS
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Filing: 1956-12-24
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Granted: 1961-07-25
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Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Clifford J Lewis
- 👤 Siegal Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:15
CPC Classifications
C; C01; C01F; C01F15/00; C22; C22B; C22B60/00; C22B60/02; C22B60/0291
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
IN A PROCESS FOR RECOVERING THORIUM, THE STEPS OF: LEACHING A THORIUM-CONTAINING MINERAL WITH DILUTE AQUEOUS SULFURIC ACID AND THEREBY OBTAINING THORIUM SULFATE IN THE ACID SOLUTION, SEPARATING THE RESULTANT THORIUMRICH ACID SOLUTION AND INTIMATELY CONTACTING IT WITH A MINOR PROPORTION OF AN IMMISCIBLE ORGANIC SELECTIVE EXTRACTION SOLVENT FOR THE THORIUM CONTENT SELECTED FROM THE GROUP CONSISTING OF DIALKYL PHOSPHORIC ACID, DODECYL PHOSPHORIC ACID, DIOCTYL PHOSPHORIC ACID, MONOHEPTYL DECYL PHOSPHORIC ACID, OLEIC ACID, AND LINOLENIC ACID, SEPARATING THE IMMISCIBLE ORGANIC SOLVENT WITH ITS CONTAINED THORIUM, INTIMATELY CONTACTING SAID ORGANIC SOLVENT WITH A MINOR PROPORTION OF STRONG AQUEOUS SULFURIC ACID HAVING SELECTIVE AFFINITY FOR THE THORIUM CONTENT OF THE ORGANIC SOLVENT, THEREBY STRIPPING AND CONCENTRATING THE THORIUM SULFATE IN SUCH STRONG SULFURIC ACID SOLUTION, HEATING SUCH STRONG SULFURIC ACID SOLUTION TO THE NEIGHBORHOOD OF 90*C., THEREBY PRECIPITATING A MAJOR PROPORTION OF THE THORIUM SULFATE, AND RECOVERING THE PRECIPITATED THORIUM SULFATE FROM THE ACID SOLUTION.
Claim 2
Dependent Claim
153 words
IN A PROCESS FOR RECOVERING THORIUM, THE STEPS OF: LEACHING A THORIUM-CONTAINING MINERAL WITH DILUTE AQUEOUS SULFURIC ACID AND THEREBY OBTAINING THORIUM SULFATE IN THE ACID SOLUTION, SEPARATING THE RESULTANT THORIUMRICH ACID SOLUTION AND INTIMATELY CONTACTING IT WITH A MINOR PROPORTION OF AN IMMISCIBLE ORGANIC SELECTIVE EXTRACTION SOLVENT FOR THE THORIUM CONTENT SELECTED FROM THE GROUP CONSISTING OF DIALKYL PHOSPHORIC ACID, DODECYL PHOSPHORIC ACID, DIOCTYL PHOSPHORIC ACID, MONOHEPTYL DECYL PHOSPHORIC ACID, OLEIC ACID, AND LINOLENIC ACID, SEPARATING THE IMMISCIBLE ORGANIC SOLVENT WITH ITS CONTAINED THORIUM, INTIMATELY CONTACTING SAID ORGANIC SOLVENT WITH A MINOR PROPORTION OF STRONG AQUEOUS SULFURIC ACID HAVING SELECTIVE AFFINITY FOR THE THORIUM CONTENT OF THE ORGANIC SOLVENT, THEREBY STRIPPING AND CONCENTRATING THE THORIUM SULFATE IN SUCH STRONG SULFURIC ACID SOLUTION, HEATING SUCH STRONG SULFURIC ACID SOLUTION TO THE NEIGHBORHOOD OF 90*C., THEREBY PRECIPITATING A MAJOR PROPORTION OF THE THORIUM SULFATE, AND RECOVERING THE PRECIPITATED THORIUM SULFATE FROM THE ACID SOLUTION.
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) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |