US3672875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of fission product noble metals from spent nuclear fuels
Assignee: WR Grace and Co
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Filing: 1969-09-05
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Granted: 1972-06-27
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Expires: 1989-09-05
Abstract
Abstract A PROCESS FOR SEPARATING THE FISSION PRODUCT METALS FROM SPENT NUCLEAR FULES, IN WHICH THE INSOLUBLES FROM THE FUEL ELEMENT DISSOLUTION ARE HEATED IN A STREAM OF HALIDE GAS TO CONVERT THE RESIDUES TO THE HALIDES. THE RUTHENIUM AND RHODIUM FRACTIONS ARE CONVERTED TO THE COMPLEX HALORUTHENITE AND HALORHODITE, FOLLOWED BY DISSOLUTION AND DISTILLATION TO REMOVE RUTHENIUM. THE RHODIUM IS RECOVERED BY NEUTRALIZING THE UNDISTILLED PORTION AND REDUCING TO THE METAL. PALLADIUM AND TECHNETIUM ARE RECOVERED FROM THE HALIDES VOLATILIZED IN THE FIRST STEP OF THE PROCESS.
Inventors
- 👤 Adolfo Maccragh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:24
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/06
Claims Analysis
Total Claims: 0
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |