US2932555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of thorium and rare earths from metallurgical sludges
Assignee: Dow Chemical Co
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Filing: 1957-10-04
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Granted: 1960-04-12
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Expires: 1977-10-04
Abstract
No abstract record available.
Inventors
- 👤 James P Flynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:27
CPC Classifications
C; C01; C01F; C01F15/00; C22; C22B; C22B59/00; C22B60/00; C22B60/02; C22B60/0291; C22B7/00; C22B7/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR THE RECOVERY OF AN ALLOYING ELEMENT OF THE GROUP CONSISTING OF THORIUM AND THE RARE EARTH ELEMENTS FROM A SALINE MAGNESIUM SLUDGE AS GENERATED DURING THE PRODUCTION OF ALLOYS OF MAGNESIUM WITH SAID ALLOYING ELEMENT IN THE PRESENCE OF A SALINE FLUX, SAID SALINE SLUDGE CONTAINING MAGNESIUM, FLUORIDE AND ACIDSOLUBLE VALUES OF THE ALLOYING ELEMENT, SAID PROCESS COMPRISING LEACHING THE SAID SLUDGE WITH AN AQUEOUS SOLVENT TO REMOVE SOLUBLE SALTS, SEPARATING THE LEACHED SOLIDS FROM THE RESULTING LEACHING SOLUTION, CALCINING THE SEPARATED LEACHED SOLIDS, TO THE CALCINED LEACHED SOLIDS ADDING MATERIAL FROM THE CLASS CONSISTING OF MAGNESIUM FLUORIDE AND THE OXIDE OF THE SAID ALLOYING ELEMENT IN AMOUNT SUFFICIENT TO MAINTAIN STOICHIOMETRIC PROPORTIONS BETWEEN MAGNESIUM FLUORIDE AND THE OXIDE OF THE ALLOWYING ELEMENT IN THE CALCINED LEACHED SOLIDS FOR THE CONVERSION OF
Claim 2
Dependent Claim
135 words
A PROCESS FOR THE RECOVERY OF AN ALLOYING ELEMENT OF THE GROUP CONSISTING OF THORIUM AND THE RARE EARTH ELEMENTS FROM A SALINE MAGNESIUM SLUDGE AS GENERATED DURING THE PRODUCTION OF ALLOYS OF MAGNESIUM WITH SAID ALLOYING ELEMENT IN THE PRESENCE OF A SALINE FLUX, SAID SALINE SLUDGE CONTAINING MAGNESIUM, FLUORIDE AND ACIDSOLUBLE VALUES OF THE ALLOYING ELEMENT, SAID PROCESS COMPRISING LEACHING THE SAID SLUDGE WITH AN AQUEOUS SOLVENT TO REMOVE SOLUBLE SALTS, SEPARATING THE LEACHED SOLIDS FROM THE RESULTING LEACHING SOLUTION, CALCINING THE SEPARATED LEACHED SOLIDS, TO THE CALCINED LEACHED SOLIDS ADDING MATERIAL FROM THE CLASS CONSISTING OF MAGNESIUM FLUORIDE AND THE OXIDE OF THE SAID ALLOYING ELEMENT IN AMOUNT SUFFICIENT TO MAINTAIN STOICHIOMETRIC PROPORTIONS BETWEEN MAGNESIUM FLUORIDE AND THE OXIDE OF THE ALLOWYING ELEMENT IN THE CALCINED LEACHED SOLIDS FOR THE CONVERSION OF
References Cited (Backward Citations)
US2546933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |