Patent US3666440A successfully refreshed from Google Patents.
US3666440A
Expired / Lapsed
US
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Method of recovering copper from slag
Assignee: Mitsubishi Metal Corp
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Filing: 1970-03-13
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Granted: 1972-05-30
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Expires: 1990-03-13
Abstract
Abstract COPPER IS RECOVERED FROM COPPER-CONTAINING SLAG BY PUTTING THE MATTE AND SLAG IN A MOLTEN STATE TOGETHER IN A SLAG TREATING FURNACE AT A VOLUME RATION OF MORE THAN 1:5, THE MELTS IN THE FURNACE BEING MAINTAINED UNDER AGITATION SO THAT THE SLAG AND MATTE ARE IN INTIMATE CONTACT SO AS TO EFFICIENTLY TRANSFER COPPER FROM THE SLAG TO THE MATTE.
Inventors
- 👤 Hiroshi Kono
- 👤 Takeyoshi Shibazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:07
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/0054; C22B7/00; C22B7/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |