Patent EP0097206A1 successfully refreshed from Google Patents.
Patent EP0099762A1 successfully refreshed from Google Patents.
US3224835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of sulfidic material
Assignee: Copper Range Co
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Filing: 1962-01-19
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Granted: 1965-12-21
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Expires: 1982-01-19
Abstract
No abstract record available.
Inventors
- 👤 William A Hockings
- 👤 Donald H Rose
- 👤 Antoine M Gaudin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:02
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B15/0084; C22B15/0089; C01; C01G; C01G3/00; C01G3/12; C22B15/0065; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
THE METHOD OF TREATING SULFIDIC MATERIAL CONTAINING COPPER IN THE CUPROUS FORM WHICH COMPRISES LEACHING SUCH MATERIAL UNDER SUBSTANTIALLY NON-OXIDIZING CONDITIONS WITH AN AQUEOUS CALCIUM CYANIDE SOLUTION HAVING A PH VARYHING FROM 9 TO 11.5, SEPARATING THE PREGNANT LEACH SOLUTION FROM THE LEACHED RESIDUE, REDUCING THE PH BY ADDING AN ACIDIC REAGENT OF THE GROUP CONSISTING OF CARBON DIOXIDE AND SULFURIC ACID, WHEREBY CUPROUS SULFIDE IS PRECIPITATED THERFROM, AND RECOVERING THE PRECIPIPATED SULFIDE.
Claim 2
Independent Claim
73 words
THE METHOD OF TREATING SULFIDIC MATERIAL CONTAINING COPPER IN THE CUPROUS FORM WHICH COMPRISES LEACHING SUCH MATERIAL UNDER SUBSTANTIALLY NON-OXIDIZING CONDITIONS WITH AN AQUEOUS CALCIUM CYANIDE SOLUTION HAVING A PH VARYHING FROM 9 TO 11.5, SEPARATING THE PREGNANT LEACH SOLUTION FROM THE LEACHED RESIDUE, REDUCING THE PH BY ADDING AN ACIDIC REAGENT OF THE GROUP CONSISTING OF CARBON DIOXIDE AND SULFURIC ACID, WHEREBY CUPROUS SULFIDE IS PRECIPITATED THERFROM, AND RECOVERING THE PRECIPIPATED SULFIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |