Patent US2815264A successfully refreshed from Google Patents.
US2815264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of monazite sand
Assignee: Individual
•
Filing: 1953-10-09
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Granted: 1957-12-03
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Expires: 1973-10-09
Abstract
No abstract record available.
Inventors
- 👤 George D Calkins
- 👤 Edward G Bohlmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:15
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/026; C22B59/00; C22B60/0221; C22B60/0247; C22B60/0278; C22B60/0282; C22B60/0291
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A METHOD FOR PROCESSING A PHOSPHATIC ORE CONTAINING RARE EARTHS AND THORIUM WHICH COMPRISES DISSOLVING THE FINELY DIVIDED ORE IN A CONCENTRATED SODIUM HYDROXIDE AQUEOUS SOLUTION, DIGESTING SAID SOLUTION AT AN ELEVATED TEMPERATURE, DILUTING SAID SOLUTION TO APPROXIMATELY A 30% SODIUM HYDROXIDE CONCENTRATION WHEREBY THE HYDROXIDES OF THORIUM, URANIUM AND THE RARE EARTHS ARE PRECIPITATED, SEPARATING THE HYDROUS OXIDES PRECIPITATE FROM THE SUPERNATANT SOLUTION, DISSOLVING SAID PRECIPITATE IN A HYDROCHLORIC ACID AQUEOUS SOLUTION, NEUTRALIZING SAID RESULTANT SOLUTION WITH SODIUM HYDROXIDE TO A PH OF 5.2-6.2 WHEREBY THE THORIUM AND URANIUM HYDROXIDES ARE PRECIPITATED LEAVING THE RARE EARTHS IN SOLUTION, SEPARATING THE PRECIPITATE FROM THE SUPERNATANT SOLUTION, DISSOLVING SAID PRECIPITATE IN NITRIC ACID, ADJUSTING THE NORMALITY OF THE FREE ACID TO 7-9 N WHEREBY TITANIUM PHOSPHATE IS PRECIPITATED, SEPARATING SAID PRECIPITATE FROM THE SOLUTION, DILUTING THE SOLUTION TO 1-7 N FREE ACID, CONTACTING SAID SOLUTION WITH A TRIBUTYL PHOSPHATE ORGANIC EXTRACTANT WHEREBY THE URANIUM AND THORIUM ARE EXTRACTED FROM THE
Claim 2
Independent Claim
159 words
A METHOD FOR PROCESSING A PHOSPHATIC ORE CONTAINING RARE EARTHS AND THORIUM WHICH COMPRISES DISSOLVING THE FINELY DIVIDED ORE IN A CONCENTRATED SODIUM HYDROXIDE AQUEOUS SOLUTION, DIGESTING SAID SOLUTION AT AN ELEVATED TEMPERATURE, DILUTING SAID SOLUTION TO APPROXIMATELY A 30% SODIUM HYDROXIDE CONCENTRATION WHEREBY THE HYDROXIDES OF THORIUM, URANIUM AND THE RARE EARTHS ARE PRECIPITATED, SEPARATING THE HYDROUS OXIDES PRECIPITATE FROM THE SUPERNATANT SOLUTION, DISSOLVING SAID PRECIPITATE IN A HYDROCHLORIC ACID AQUEOUS SOLUTION, NEUTRALIZING SAID RESULTANT SOLUTION WITH SODIUM HYDROXIDE TO A PH OF 5.2-6.2 WHEREBY THE THORIUM AND URANIUM HYDROXIDES ARE PRECIPITATED LEAVING THE RARE EARTHS IN SOLUTION, SEPARATING THE PRECIPITATE FROM THE SUPERNATANT SOLUTION, DISSOLVING SAID PRECIPITATE IN NITRIC ACID, ADJUSTING THE NORMALITY OF THE FREE ACID TO 7-9 N WHEREBY TITANIUM PHOSPHATE IS PRECIPITATED, SEPARATING SAID PRECIPITATE FROM THE SOLUTION, DILUTING THE SOLUTION TO 1-7 N FREE ACID, CONTACTING SAID SOLUTION WITH A TRIBUTYL PHOSPHATE ORGANIC EXTRACTANT WHEREBY THE URANIUM AND THORIUM ARE EXTRACTED FROM THE
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |