Patent US3288593A successfully refreshed from Google Patents.
US3288593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of metals
Assignee: United Metallurgical Corp
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Filing: 1963-11-08
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Granted: 1966-11-29
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Expires: 1983-11-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Hugh R Smith
- 👤 Charles D A Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:39
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/16; C22B9/22; C22B9/228; C22B9/14; H; H01; H01J; H01J37/00; H01J37/30; H01J37/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF PRODUCING A HIGHLY PURIFIED METAL OR ALLOY SELECTED FROM THE GROUP CONSISTING OF COLUMBIUM, TANTALUM, MOLYBDENUM, TUNGSTEN, HAFNIUM, ZIRONIUM AND RHENIUM FROM A MIXTURE OF AN OXIDE OF SAID METAL AND A REDUCING AGENT SELECTED FROM ALUMINUM AND SILICON, COMPRISNG REACTING SAID MIXTURE AT REDUCED PRESSURE OF NOT MORE THAN ABOUT 2 MICRONS OF MERCURY AND AT AN ELEVATED TEMPERATURE IN AN ELECTRON BEAM FURNACE TO FROM REDUCING AGENT OXIDES, SAID REDUCING AGENT OXIDES BEING MORE VOLATILE THAN SAID METAL AT SAID PRESSURE AND SAID TEMPERATURE, VAPORIZING SAID REDUCING AGENT OXIDES FROM SAID METAL AND RECOVERING SAID METAL IN A PURIFIED FROM.
Claim 2
Independent Claim
105 words
THE METHOD OF PRODUCING A HIGHLY PURIFIED METAL OR ALLOY SELECTED FROM THE GROUP CONSISTING OF COLUMBIUM, TANTALUM, MOLYBDENUM, TUNGSTEN, HAFNIUM, ZIRONIUM AND RHENIUM FROM A MIXTURE OF AN OXIDE OF SAID METAL AND A REDUCING AGENT SELECTED FROM ALUMINUM AND SILICON, COMPRISNG REACTING SAID MIXTURE AT REDUCED PRESSURE OF NOT MORE THAN ABOUT 2 MICRONS OF MERCURY AND AT AN ELEVATED TEMPERATURE IN AN ELECTRON BEAM FURNACE TO FROM REDUCING AGENT OXIDES, SAID REDUCING AGENT OXIDES BEING MORE VOLATILE THAN SAID METAL AT SAID PRESSURE AND SAID TEMPERATURE, VAPORIZING SAID REDUCING AGENT OXIDES FROM SAID METAL AND RECOVERING SAID METAL IN A PURIFIED FROM.
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |