US3751554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the extraction of nickel,copper and cobalt from manganiferous ores
Assignee: Bethlehem Steel Corp
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Filing: 1971-08-19
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Granted: 1973-08-07
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Expires: 1991-08-19
Abstract
Abstract A PROCESS FOR THE EXTRACTION OF NICKEL, COPPER AND COBALT FROM MANGANIFEROUS ORES, SUCH AS DEEP SEA NODULES, IN WHICH THE ORE IS ROASTED FROM ABOUT 700*F. TO ABOUT 1400*F. IN A REDUCING ATMOSPHERE. THE ORE IS COOLED UNDER NON-OXIDIZING CONDITIONS, AND LEACHED UNDER OXIDIZING CONDITIONS WITH AN AMMONIACAL-AMMONIUM CARBONATE SOLUTION COMPRISING ABOUT 55 TO 160 GRAMS PER LITER OF AMMONIA AND ABOUT 30 TO 120 GRAMS PER LITER OF CARBON DIOXIDE.
Inventors
- 👤 C Bare
- 👤 J Pasquali
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:15
CPC Classifications
C; C22; C22B; C22B47/00; C22B47/0018; C22B47/0027; C22B47/0045; C22B47/0054; C22B47/0072; Y; Y10; Y10S; Y10S423/00; Y10S423/04
Claims Analysis
Total Claims: 0
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |