Patent US3709678A successfully refreshed from Google Patents.
US3709678A
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US
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Process for the preparation of metals or alloys
Assignee: GRAVIERE M DE
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Filing: 1970-03-04
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Granted: 1973-01-09
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Expires: 1990-03-04
Abstract
Abstract A reaction mixture is placed in a furnace comprising a vertical vessel which is transparent to electromagnetic fields and in direct contact with the mixture. High-frequency electric currents are induced in said mixture through the vessel and are of sufficient intensity to start the reaction while the vessel is cooled so as to maintain a solid layer of slag in contact therewith. The reaction mass is maintained molten for a sufficient period of time to cause settling of the metal prior to solidification in situ. The vessel is throttled towards its base.
Inventors
- 👤 J Gallay
- 👤 M Gallay
- 👤 J Helary
- 👤 La Graviere M De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:24
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; C; C22; C22B; C22B4/00; C22B5/00; C22B5/02; C22B5/04; C22B5/06; C22B60/00; C22B60/02; C22B60/0204; C22B60/0213; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y10; Y10S; Y10S75/00; Y10S75/959
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A process according to claim 1 for the preparation of plutonium or uranium by calciothermic reduction from PuF4 or UF4, including the step of preparing the reaction mixture by intimately mixing a powdered metal fluoride and granular calcium.
Claim 2
Dependent Claim
17 words
A process according to claim 1, said vessel having an internal surface throttled toward its lower end.
References Cited (Backward Citations)
US2899298A
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US2899297A
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US1904664A
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US2977220A
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US2877109A
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US3549353A
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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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |