Patent US2791485A successfully refreshed from Google Patents.
US2791485A
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Process for removal of hafnium from zirconium-containing material
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1953-06-08
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Granted: 1957-05-07
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Expires: 1973-06-08
Abstract
No abstract record available.
Inventors
- 👤 Newnham Ivan Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:41
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS FOR REMOVING HAFNIUM FROM ZIRCONIUMCONTAINING MATERIAL, COMPRISING THE CONVERSION OF THE ZIRCONIUM COMPONENT AND THE ASSOCIATED HAFNIUM COMPONENT INTO TETRAHALIDES, FOLLOWED BY THE REDUCTION OF THE TETRAHALIDE OF ZIRCONIUM TO AT LEAST LOWER HALIDES WHILE THE HALFNIUM TETRAHALIDE REMAINS UNCHANGED, AND THE SEPARATION OF THE UNCHANGED HAFNIUM TETRAHALIDE FROM THE REDUCED ZIRCONIUM COMPOUND BY SUBLIMATION OF THE HAFNIUM TETRAHALIDE.
Claim 2
Dependent Claim
61 words
A PROCESS FOR REMOVING HAFNIUM FROM ZIRCONIUMCONTAINING MATERIAL, COMPRISING THE CONVERSION OF THE ZIRCONIUM COMPONENT AND THE ASSOCIATED HAFNIUM COMPONENT INTO TETRAHALIDES, FOLLOWED BY THE REDUCTION OF THE TETRAHALIDE OF ZIRCONIUM TO AT LEAST LOWER HALIDES WHILE THE HALFNIUM TETRAHALIDE REMAINS UNCHANGED, AND THE SEPARATION OF THE UNCHANGED HAFNIUM TETRAHALIDE FROM THE REDUCED ZIRCONIUM COMPOUND BY SUBLIMATION OF THE HAFNIUM TETRAHALIDE.
References Cited (Backward Citations)
US2618531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-06 | 1960-11-05 | 1961-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-06 | 1964-11-05 | 1965-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-06 | 1968-11-05 | 1969-05-07 | $7700.00 | Window Closed / Lapsed |