US2953430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparation of uranium dioxide
Assignee: Mallinckrodt Chemical Works
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Filing: 1957-03-11
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Granted: 1960-09-20
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Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 William M Leaders
- 👤 Donald E Rhodes
- 👤 Jr Carl W Kuhlman
- 👤 Gerard C Hemkens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:24
CPC Classifications
C; C01; C01G; C01G43/00; C01G43/01; C01G43/025; C01P; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE METHOD OF PREPARING SUBSTANTIALLY FLUORIDE-FREE URANIUM DIOXIDE WHICH COMPRISES THERMALLY DECOMPOSING FLUORIDE-CONTAINING AMMONIUM DIURANATE IN NICKEL ALLOY EQUIPMENT AT A TEMPERATURE ABOVE APPROXIMATELY 400*C. IN A CURRENT FROM AN EXTERNAL SOURCE CONTAINING HYDROGEN AND A SIGNFICANT AMOUNT OF STEAM UNTIL THE AMMONIUM DIURANATE IS CONVERTED TO SUBSTANTIALLY FLUORIDE-FREE BLACK OXIDE OF THE FORMULA U3O8, AND THEREAFTER HEATING SAID BLACK OXIDE IN AN ATMOSPHERE OF HYDROGEN UNTIL IT IS REDUCED TO SUBSTANTIALLY FLUORIDE-FREE URANIUM DIOXIDE.
Claim 2
Independent Claim
75 words
THE METHOD OF PREPARING SUBSTANTIALLY FLUORIDE-FREE URANIUM DIOXIDE WHICH COMPRISES THERMALLY DECOMPOSING FLUORIDE-CONTAINING AMMONIUM DIURANATE IN NICKEL ALLOY EQUIPMENT AT A TEMPERATURE ABOVE APPROXIMATELY 400*C. IN A CURRENT FROM AN EXTERNAL SOURCE CONTAINING HYDROGEN AND A SIGNFICANT AMOUNT OF STEAM UNTIL THE AMMONIUM DIURANATE IS CONVERTED TO SUBSTANTIALLY FLUORIDE-FREE BLACK OXIDE OF THE FORMULA U3O8, AND THEREAFTER HEATING SAID BLACK OXIDE IN AN ATMOSPHERE OF HYDROGEN UNTIL IT IS REDUCED TO SUBSTANTIALLY FLUORIDE-FREE URANIUM DIOXIDE.
References Cited (Backward Citations)
US2664348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |