Patent US820908A successfully refreshed from Google Patents.
Patent US3107976A successfully refreshed from Google Patents.
US3107976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Niobium-tantalum separation
Assignee: Individual
•
Filing: 1957-11-29
•
Granted: 1963-10-22
•
Expires: 1977-11-29
Abstract
No abstract record available.
Inventors
- 👤 Ernest L Koerner
- 👤 Smutz Morton
- 👤 Harley A Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:49
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A PROCESS OF SEPARATELY RECOVERING IN PURE FORM NIOBIUM VALUES AND TANTALUM VALUES CONTAINED IN AN OXIDIC ORE, CONSISTING OF GRINDING SAID OXIDIC ORE; DISGESTING SAID OXIDIC ORE WITH A MEDIUM CONSISTING OF CONCENTRATED SULFURIC ACID AT A TEMPERATURE OF BETWEEN 200 AND 400*C., WHEREBY AN INSOLUBLE RESIDUE AND A SULFATE LIQUOR ARE OBTAINED; SEPARATING THE RESIDUE FROM THE SULFATE LIQUOR; LEACHING THE RESIDUE WITH WATER WHEREBY A TANTALUM-RICH HYDROXIDE IS OBTAINED, WHILE THE BULK OF THE IMPURITIES REMAIN IN SOLUTION; SEPARATING THE TANTALUM-RICH PRECIPITATE AND UNREACTED ORE FROM THE SOLUTIONF SELECTIVELY DISSOLVING THE TANTALUM-RICH HYDROXIDE IN HYDROFLUORIC ACID; SEPARATING UNREACTED ORE FROM THE TANTALUM SOLUTION FORMED; NEUTRALIZING THE TANTALUM SOLUTION WITH AMMONIUM HYDROXIDE WHEREBY TANTALUM HYDROXIDE PRECIPITATES; SEPARATING SAID TANTALUM HYDROXIDE FROM THE SOLUTION; DILUTING THE SULFATE LIQUOR WITH WATER WHEREBY A NIOBIUM-RICH HYDROXIDE PRECIPITATE FORMS; AND SEPARATING THE NIOBIUMRICH PRECIPITATE FROM THE SULFATE LIQUOR.
Claim 2
Dependent Claim
146 words
A PROCESS OF SEPARATELY RECOVERING IN PURE FORM NIOBIUM VALUES AND TANTALUM VALUES CONTAINED IN AN OXIDIC ORE, CONSISTING OF GRINDING SAID OXIDIC ORE; DISGESTING SAID OXIDIC ORE WITH A MEDIUM CONSISTING OF CONCENTRATED SULFURIC ACID AT A TEMPERATURE OF BETWEEN 200 AND 400*C., WHEREBY AN INSOLUBLE RESIDUE AND A SULFATE LIQUOR ARE OBTAINED; SEPARATING THE RESIDUE FROM THE SULFATE LIQUOR; LEACHING THE RESIDUE WITH WATER WHEREBY A TANTALUM-RICH HYDROXIDE IS OBTAINED, WHILE THE BULK OF THE IMPURITIES REMAIN IN SOLUTION; SEPARATING THE TANTALUM-RICH PRECIPITATE AND UNREACTED ORE FROM THE SOLUTIONF SELECTIVELY DISSOLVING THE TANTALUM-RICH HYDROXIDE IN HYDROFLUORIC ACID; SEPARATING UNREACTED ORE FROM THE TANTALUM SOLUTION FORMED; NEUTRALIZING THE TANTALUM SOLUTION WITH AMMONIUM HYDROXIDE WHEREBY TANTALUM HYDROXIDE PRECIPITATES; SEPARATING SAID TANTALUM HYDROXIDE FROM THE SOLUTION; DILUTING THE SULFATE LIQUOR WITH WATER WHEREBY A NIOBIUM-RICH HYDROXIDE PRECIPITATE FORMS; AND SEPARATING THE NIOBIUMRICH PRECIPITATE FROM THE SULFATE LIQUOR.
Claim 3
Dependent Claim
56 words
A PROCESS OF SEPARATING NIOBIUM VALUES FROM TANTALUM VALUES CONTAINED IN AN OXIDIC ORE, CONSISTING OF GRINDING SAID ORE, DIGESTING SAID ORE WITH A MEDIUM CONSISTING OF SULFURIC ACID OF A CONCENTRATION OF BETWEEN 90 AND 98 PERCENT AT A TEMPERATURE OF BETWEEN 200 AND 400* C., AND SEPARATING A TANTALUM-CONTAINING RESIDUE FROM A NIOBIUM-CONTAINING SOLUTION.
Claim 4
Dependent Claim
56 words
A PROCESS OF SEPARATING NIOBIUM VALUES FROM TANTALUM VALUES CONTAINED IN AN OXIDIC ORE, CONSISTING OF GRINDING SAID ORE, DIGESTING SAID ORE WITH A MEDIUM CONSISTING OF SULFURIC ACID OF A CONCENTRATION OF BETWEEN 90 AND 98 PERCENT AT A TEMPERATURE OF BETWEEN 200 AND 400* C., AND SEPARATING A TANTALUM-CONTAINING RESIDUE FROM A NIOBIUM-CONTAINING SOLUTION.
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) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |