US2961293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hafnium tetrahalide
Assignee: RMI Co
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Filing: 1957-02-19
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Granted: 1960-11-22
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Expires: 1977-02-19
Abstract
No abstract record available.
Inventors
- 👤 Newnham Ivan Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:37
CPC Classifications
C; C01; C01G; C01G27/00; C01G27/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A METHOD OF PURIFYING HAFNIUM TETRAHALIDE WHICH COMPRISES REACTING A MIXTURE OF HAFNIUM AND ZIRCONIUM TETRAHALIDES SELECTED FROM THE GROUP CONSISTING OF TETRACHLORIDES, TETRABROMIDES, AND TETRAIODIDES WITH FINELY DIVIDED ZIRCONIUM SPONGE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 250* TO 500*C. TO SELECTIVELY REDUCE THE ZIRCONIUM TETRAHALIDE TO INVOLATILE LOWER HALIDES, WHILE THE HAFNIUM TETRAHALIDE REMAINS UNCHANGED, AND THEN SEPARATING THE UNCHANGED VOLATILE HAFNIUM TETRAHALIDE FROM THE REDUCED ZIRCONIUM TETRAHALIDE PRODUCT.
Claim 2
Independent Claim
72 words
A METHOD OF PURIFYING HAFNIUM TETRAHALIDE WHICH COMPRISES REACTING A MIXTURE OF HAFNIUM AND ZIRCONIUM TETRAHALIDES SELECTED FROM THE GROUP CONSISTING OF TETRACHLORIDES, TETRABROMIDES, AND TETRAIODIDES WITH FINELY DIVIDED ZIRCONIUM SPONGE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 250* TO 500*C. TO SELECTIVELY REDUCE THE ZIRCONIUM TETRAHALIDE TO INVOLATILE LOWER HALIDES, WHILE THE HAFNIUM TETRAHALIDE REMAINS UNCHANGED, AND THEN SEPARATING THE UNCHANGED VOLATILE HAFNIUM TETRAHALIDE FROM THE REDUCED ZIRCONIUM TETRAHALIDE PRODUCT.
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) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |