Patent US3058825A successfully refreshed from Google Patents.
US3058825A
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Process for recovering columbium and tantalum from ores and ore concentrates containing same
Assignee: Individual
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Filing: 1958-09-22
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Granted: 1962-10-16
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Expires: 1978-09-22
Abstract
No abstract record available.
Inventors
- 👤 Paul B Cardon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:33
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24; C22B3/00; C22B3/04; C22B3/12; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A PROCESS FOR RECOVERING COLUMBIUM AND TANTALUM FROM COLUMNIUM-TANTALUM OXIDE ORES AND ORE CONCENTRATES, THE STEP OF DIGESTING SUCH AN ORE OR ORE CONCENTRATE UNDER SUPERATMOSPHERIC PRESSURE WITH A HOT AQUEOUS SOLUTION OF POTASSIUM HYDROXIDE, TO BREAK DOWN THE ORE OR ORE CONCENTRATE AND FORM A POTASSIUM COLUMBATE-TANTALATE SALT, THE POTASSIUM HYDROXIDE BEING PRESENT WITHIN A RATIO RANGE OF FROM A RATIO OF ABOUT 4.47 MOLES THEREOF TO 1 MOLE OF THE COMBINED COLUMBIUM-TANTALUM OXIDES TO A RATIO OF ABOUT 5.26 TO 1, AND THE DIGESTION PRODUCT BEING A SLURRY IN WHICH THE POTASSIUM COLUMBATE-TANTALATE SALT IS DISSOLVED.
Claim 2
Dependent Claim
99 words
IN A PROCESS FOR RECOVERING COLUMBIUM AND TANTALUM FROM COLUMNIUM-TANTALUM OXIDE ORES AND ORE CONCENTRATES, THE STEP OF DIGESTING SUCH AN ORE OR ORE CONCENTRATE UNDER SUPERATMOSPHERIC PRESSURE WITH A HOT AQUEOUS SOLUTION OF POTASSIUM HYDROXIDE, TO BREAK DOWN THE ORE OR ORE CONCENTRATE AND FORM A POTASSIUM COLUMBATE-TANTALATE SALT, THE POTASSIUM HYDROXIDE BEING PRESENT WITHIN A RATIO RANGE OF FROM A RATIO OF ABOUT 4.47 MOLES THEREOF TO 1 MOLE OF THE COMBINED COLUMBIUM-TANTALUM OXIDES TO A RATIO OF ABOUT 5.26 TO 1, AND THE DIGESTION PRODUCT BEING A SLURRY IN WHICH THE POTASSIUM COLUMBATE-TANTALATE SALT IS DISSOLVED.
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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |