US2953453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of columbium values
Assignee: Millennium Petrochemicals Inc
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Filing: 1958-06-20
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Granted: 1960-09-20
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Expires: 1978-06-20
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Foos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:43
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR RECOVERING COLUMBIUM VALUES FROM COLUMBIUM-CONTAINING MATERIAL WHICH COMPRISES (A) REACTING SAID COLUMBIUM-CONTAINING MATERIAL WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, POTASSIUM HYDROXIDE, SULFURIC ACID AND HYDROFLUORIC ACID, (B) LEACHING THE RESULTING REACTION MIXTURE WITH WATER TO REMOVE WATER-SOLUBLE IMPURITIES, (C) LEACHING THE WATER-LEACHING REACTION MIXTURE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF NITRIC, HYDROCHLORIC AND SULFURIC TO REMOVE ACID-SOLUBLE METALLIC IMPURITIES, (D) REACTING SAID LEACHED REACTION MIXTURE WITH HYDROFLUORIC ACID TO OBTAIN A MIXTURE CONTAINING FLUOCOMPLEXES OF COLUMBIUM IN ACCORDANCE WITH THE FOLLOWING REACTION:
Claim 2
Dependent Claim
93 words
A PROCESS FOR RECOVERING COLUMBIUM VALUES FROM COLUMBIUM-CONTAINING MATERIAL WHICH COMPRISES (A) REACTING SAID COLUMBIUM-CONTAINING MATERIAL WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, POTASSIUM HYDROXIDE, SULFURIC ACID AND HYDROFLUORIC ACID, (B) LEACHING THE RESULTING REACTION MIXTURE WITH WATER TO REMOVE WATER-SOLUBLE IMPURITIES, (C) LEACHING THE WATER-LEACHING REACTION MIXTURE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF NITRIC, HYDROCHLORIC AND SULFURIC TO REMOVE ACID-SOLUBLE METALLIC IMPURITIES, (D) REACTING SAID LEACHED REACTION MIXTURE WITH HYDROFLUORIC ACID TO OBTAIN A MIXTURE CONTAINING FLUOCOMPLEXES OF COLUMBIUM IN ACCORDANCE WITH THE FOLLOWING REACTION:
References Cited (Backward Citations)
US2795481A
Cited
US2773737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |