Patent US1612410A successfully refreshed from Google Patents.
Patent US2938769A successfully refreshed from Google Patents.
US2938769A
Expired / Lapsed
US
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Separation of hafnium from zirconium
Assignee: Individual
•
Filing: 1952-07-31
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Granted: 1960-05-31
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Expires: 1972-07-31
Abstract
No abstract record available.
Inventors
- 👤 Lyle G Overholser
- 👤 Sr Charles J Barton
- 👤 John W Ramsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:18
CPC Classifications
C; C01; C01G; C01G27/00; C01G27/003; C01G25/00; C01G25/003; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/306; C22B3/34; C22B3/40; C22B3/402; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
AN IMPROVED SOLVENT EXTRACTION PROCESS FOR EFFECTING SUBSTANTIALLY QUANTITATIVE SEPARATION OF HAFNIUM IMPURITIES FROM ZIRCONIUM VALUES WHICH COMPRISES CONTACING AN AQUEOUS FEED SOLUTION PHASE CONTAINING ZIRCONIUM, HAFNIUM, AND CHLORIDE VALUES, WITH A METHYL ISOBUTYL KETONE PHASE, AT LEAST ONE OF SAID PHASES CONTAINING THIOCYANATE VALUES, SEPARATING THE RESULTING ZIRCONIUM ENRICHED AQUEOUS PHASE FROM THE RESULTING HAFNIUM HYRICHED METHYL ISOBUTYL KETONE, CONTACTING SAID HAFNIUM ENRICHED METHYL ISOBUTYL KETONE WITH AN AQUEOUS HYDROCHLORIC ACID SOLUTION, SEPARATING THE RESULTING ZIRCONIUM-CONTAINING HYDROCHLORIC ACID SOLUTION FROM THE RESULTING ZIRCONIUM-DEPLETED, HAFNIUM-ENRICHED METHYL ISOBUTYL KETONE, AND ACIDIFYING SAID FEED SOLUTION WITH THE RESULTING ZIRCONIUM-CONTAINING HYDROCHLORIC ACID SOLUTION.
Claim 2
Dependent Claim
100 words
AN IMPROVED SOLVENT EXTRACTION PROCESS FOR EFFECTING SUBSTANTIALLY QUANTITATIVE SEPARATION OF HAFNIUM IMPURITIES FROM ZIRCONIUM VALUES WHICH COMPRISES CONTACING AN AQUEOUS FEED SOLUTION PHASE CONTAINING ZIRCONIUM, HAFNIUM, AND CHLORIDE VALUES, WITH A METHYL ISOBUTYL KETONE PHASE, AT LEAST ONE OF SAID PHASES CONTAINING THIOCYANATE VALUES, SEPARATING THE RESULTING ZIRCONIUM ENRICHED AQUEOUS PHASE FROM THE RESULTING HAFNIUM HYRICHED METHYL ISOBUTYL KETONE, CONTACTING SAID HAFNIUM ENRICHED METHYL ISOBUTYL KETONE WITH AN AQUEOUS HYDROCHLORIC ACID SOLUTION, SEPARATING THE RESULTING ZIRCONIUM-CONTAINING HYDROCHLORIC ACID SOLUTION FROM THE RESULTING ZIRCONIUM-DEPLETED, HAFNIUM-ENRICHED METHYL ISOBUTYL KETONE, AND ACIDIFYING SAID FEED SOLUTION WITH THE RESULTING ZIRCONIUM-CONTAINING HYDROCHLORIC ACID SOLUTION.
References Cited (Backward Citations)
US2227833A
Cited
US2578623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |