Patent US3681016A successfully refreshed from Google Patents.
US3681016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of rhenium and molybdenum values from solution
Assignee: Continental Ore Corp
•
Filing: 1970-12-02
•
Granted: 1972-08-01
•
Expires: 1990-12-02
Abstract
Abstract A PROCESS FOR RECOVERING RHENIUM AND MOLYBDENUM VALUES FROM SOLUTION COMPRISING: EXTRACTING THE SOLUBLE MOLYBDENUM AND RHENIUM VALUES WITH AN AMINE SOLVENT, STRIPPING THE VALUES FROM THE AMINE EXTRACT WITH AN AMMONIUM HYDROXIDE SOLUTION, PURIFYING THE STRIP SOLUTION OF COPPER, IRON, SILICON, PHOSPHOROUS, AND ARSENIC, CRYSTALLIZING THE MOLYBDENUM AS AMMONIUM TETRAMLYBDATE CONTAINING A MINIMUM OF RHENIUM AND OTHER IMPURITIES, AND CONCENTRATING AND RECOVERING THE RHENIUM FROM THE CRYSTALLIZATION MOTHER LIQUOR BY AMINE SOLVENT EXTRACTION, STRIPPING WITH SODIUM HYDROXIDE SOLUTION, EXTRACTION INTO A PYDRIDINE SOLVENT, AND DISTILLATION OF THE PYRIDINE AWAY FROM A RHENIUM SALT.
Inventors
- 👤 John E Litz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:27
CPC Classifications
C; C22; C22B; C22B61/00; C01; C01G; C01G39/00; C01G39/003; C01G47/00; C22B3/00; C22B3/20; C22B3/26; C22B3/28; C22B3/42; C22B34/00; C22B34/30; C22B34/34; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |