US3734715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of metal values from complex ores
Assignee: Kennecott Utah Copper LLC
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Filing: 1970-07-16
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Granted: 1973-05-22
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Expires: 1990-07-16
Abstract
Abstract COPPER, NICKEL, COBALT ANDMOLYBDENUM MAY BE EXTRACTED FROM COMPLEX ORES CONTAINING MANGANESE, IRON, COPPER, NICKEL, COBALT AND MOLYBDENUM BY SUBJECTING THE COMPLEX ORE TO GASEOUS REDUCTANTS AT TEMPERATURES IN THE RANGE OF 300 TO 800*C. AND LEACHING THE REDUCED COMPLEX ORE WITH A SOLUTION OF AN AMMONIUM SALT IN AQUEOUS AMMONIA.
Inventors
- 👤 Michael J Redman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:21
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/34; C22B23/00; C22B23/005; C22B23/04; C22B23/0407; C22B23/0446; C22B3/00; C22B3/04; C22B3/12; C22B3/14; C22B47/00; C22B47/0018; C22B47/0027; C22B47/0045; C22B47/0054; C22B47/0072; C22B5/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/04
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |