US2817583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Working up of sulfidic raw materials
Assignee: BASF SE
•
Filing: 1956-05-10
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Granted: 1957-12-24
•
Expires: 1976-05-10
Abstract
No abstract record available.
Inventors
- 👤 Schlecht Leo
- 👤 Staeger Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:26
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN THE PROCESS OF SULFIDIC RAW MATERIALS CONTAINING IRON AND AT LEAST ONE OF THE METALS COPPER, NICKEL, COBALT AND ZINC BY ROASTING AND LEACHING, THE IMPROVEMENT WHICH COMPRISES FRIST SUBJECTING THE SULFIDIC RAW MATERIAL TO A PRELIMINARY ROASTING IN A FIRST STAGE WITHOUT TH ADDITION OF SULFUR DIOXIDE AT TEMPERATURES BETWEEN 600* AND 800*C. UNTIL AN AMOUNT OF SULFUR HAS BEEN VOLATILIZED SUCH AS CORRESPONDS TO THE AMOUNTS COMBINED WITH IRON, AND THEN FURTHER ROASTING THE MATERIAL IN A SECOND STAGE WITH AIR CONTAINING SULFUR DIOXIDE AS THE ONLY SULFATING AGENT AT EMPERATURES BETWEEN 500* AND 700*C.
Claim 2
Dependent Claim
98 words
IN THE PROCESS OF SULFIDIC RAW MATERIALS CONTAINING IRON AND AT LEAST ONE OF THE METALS COPPER, NICKEL, COBALT AND ZINC BY ROASTING AND LEACHING, THE IMPROVEMENT WHICH COMPRISES FRIST SUBJECTING THE SULFIDIC RAW MATERIAL TO A PRELIMINARY ROASTING IN A FIRST STAGE WITHOUT TH ADDITION OF SULFUR DIOXIDE AT TEMPERATURES BETWEEN 600* AND 800*C. UNTIL AN AMOUNT OF SULFUR HAS BEEN VOLATILIZED SUCH AS CORRESPONDS TO THE AMOUNTS COMBINED WITH IRON, AND THEN FURTHER ROASTING THE MATERIAL IN A SECOND STAGE WITH AIR CONTAINING SULFUR DIOXIDE AS THE ONLY SULFATING AGENT AT EMPERATURES BETWEEN 500* AND 700*C.
References Cited (Backward Citations)
US1657711A
Cited
US2719082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |