US2916362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of zirconium tetrachloride
Assignee: NL Industries Inc
•
Filing: 1954-04-16
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Granted: 1959-12-08
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Expires: 1974-04-16
Abstract
No abstract record available.
Inventors
- 👤 Horrigan Robert Vincent
- 👤 Sprague Owen Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:51
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PROCESS FOR PURIFYING TETRACHLORIDES OF ZIRCONIUM AND HALFNIUM WHICH COMPRISES FORMING, FROM A MIXTURE OF IMPURE TETRACHLORIDE OF AT LEAST ONE OF SAID METALS AND AT LEAST ONE CHLORIDE OF THE GROUP CONSISTING OF ALKALI METAL CHLORIDES AND ALKALINE-EARTH METAL CHLORIDES, A COMPLETELY FUSED, SUBSTANTIALLY HOMOGENEOUS MELT CONTAINING ABOVE ABOUT 40 MOL PERCENT BUT NOT ABOVE ABOUT 70 MOL PERCENT OF SAID TETRACHLORIDE AND AT LEAST ABOUT 20 MOL PERCENT OF AN ALKALI METAL CHLORIDE; THEREAFTER DISTILLING PURIFIED TETRACHLORIDE FROM SAID MELT BY HEATING SAID MELT TO A TEMPERATURE BETWEEN ABOUT 450*C. AND ABOUT 600*C. WHILE THE TETRACHLORIDE CONTENT OF SAID MELT REMAINS ABOVE ABOUT 40 MOL PERCENT; AND CONDENSING THE EVOLVED PURIFIED TETRACHLORIDE.
Claim 2
Dependent Claim
115 words
A PROCESS FOR PURIFYING TETRACHLORIDES OF ZIRCONIUM AND HALFNIUM WHICH COMPRISES FORMING, FROM A MIXTURE OF IMPURE TETRACHLORIDE OF AT LEAST ONE OF SAID METALS AND AT LEAST ONE CHLORIDE OF THE GROUP CONSISTING OF ALKALI METAL CHLORIDES AND ALKALINE-EARTH METAL CHLORIDES, A COMPLETELY FUSED, SUBSTANTIALLY HOMOGENEOUS MELT CONTAINING ABOVE ABOUT 40 MOL PERCENT BUT NOT ABOVE ABOUT 70 MOL PERCENT OF SAID TETRACHLORIDE AND AT LEAST ABOUT 20 MOL PERCENT OF AN ALKALI METAL CHLORIDE; THEREAFTER DISTILLING PURIFIED TETRACHLORIDE FROM SAID MELT BY HEATING SAID MELT TO A TEMPERATURE BETWEEN ABOUT 450*C. AND ABOUT 600*C. WHILE THE TETRACHLORIDE CONTENT OF SAID MELT REMAINS ABOVE ABOUT 40 MOL PERCENT; AND CONDENSING THE EVOLVED PURIFIED TETRACHLORIDE.
References Cited (Backward Citations)
US2443253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |