US2537316A
Expired / Lapsed
US
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Separation of columbium and tantalum values
Assignee: Engility LLC
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Filing: 1947-09-12
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Granted: 1951-01-09
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Expires: 1967-09-12
Abstract
No abstract record available.
Inventors
- 👤 Oppegaard Assur Gjessing
- 👤 Ravnestad Andreas Johan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:19
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
A PROCESS FOR RECOVERY OF COLUMBIUM AND TANTALUM VALUES ORE CONTAINING OTHER METAL IMPURITIES WHICH COMPIRSES DECOMPOSING SAID ORE WITH AN ACID DECOMPOSITION AGENT, ADDING A STRONG REDUCING AGENT TO THE RESULTANT LIQUID DECOMPOSITION PRODUCT IN SUFFICIENT AMOUNT AS TO REDUCE TO SOLUBLE COMPOUNDS OF LOWER VALENCE THE OTHER METAL IMPURITIES BUT NOT MORE THAN A SMALL AMOUNT OF THE COLUMBIUM AND TANTALUM AND PRECIPITATING UNREDUCED COLUMBIUM AND TANTALUM VALUES FROM THE LIQUID PORTION OF SAID REDUCED DECOMPOSITION PRODUCT BY HYDROLYSIS, FILTERING OFF SAID HYDROLYZED COLUMBIUM AND TANTALUM VALUES, AND REDISSOLVING THE SAME IN AN ACID SULPHATE DISSOLVING AGENT, REDUCING THE COLUMBIUM IN THE RESULTANT SOLUTION SUBSTANTIALLY TO 4-VALENT STATE PRECIPITATING TANTALUM VALUES FROM SAID SOLUTION BY HYDROLYSIS, REOXIDIZING THAT COLUMBIUM IN SAID SOLUTION TO 5-VALENT STATE AND PRECIPITATING COLUMBIUM VALUES BY HYDROLYSIS.
References Cited (Backward Citations)
US2259396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |