Patent US2676882A successfully refreshed from Google Patents.
US2676882A
Expired / Lapsed
US
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Method for recovering refractory metals
Assignee: Kennecott Corp
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Filing: 1950-05-31
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Granted: 1954-04-27
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Expires: 1970-05-31
Abstract
No abstract record available.
Inventors
- 👤 Gerald G Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:53
CPC Classifications
C; C22; C22B; C22B34/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
IN A METHOD OF RECOVERING A REFRACTORY METAL FROM A REACTION MASS CONSISTING SAID REFRACTORY METAL IN FINELY DIVIDED FORM, MERCURY AND A CHLORIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, ALKALINE EARTH METALS AND MAGNESIUM, THE STEPS COMPRISING: FIRST, COMPRESSING SAID MASS AGAINST A CONICAL PERFORATE AREA CONVERGING IN THE DIRECTION OF THE COMPRESSIVE FORCE, MAINTAINING THE TEMPERATURE OF SAID MASS BELOW THE MELTING POINT OF THE CHLORIDE OF THE METAL SELECTED, EXPRESSING SUBSTANTIALLY ALL OF THE MERCURY THROUGH SAID CONICAL PERFORATE BARRIER TO LEAVE A RELATIVELY MERCURY-FREE MASS;
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |