US2727818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of leaching copper sulfide materials with ammoniacal leach solution
Assignee: Calumet and Hecla Inc
•
Filing: 1951-12-01
•
Granted: 1955-12-20
•
Expires: 1971-12-01
Abstract
No abstract record available.
Inventors
- 👤 Herman C Kenny
- 👤 Helmer A Abramson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:44
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A PROCESS FOR RECOVERING COPPER VALUES FROM COPPER SULFIDE MATERIAL, THE STEP OF CONTACTING A BATCH OF SUCH MATERIAL IN SOLID STATE UNTIL A MAJOR PORTION OF THE COPPER CONTENT HAS BEEN DISSOLVED WITH AN OXYGENCONTAINING GAS AND AN AQUEOUS, AMMONIACAL, AMMONIUM CARBONATE LEACHING SOLUTION CONTAINING INITIALLY FROM 0.1 TO 15 GRAMS PER LITER OF A PROMOTER OF THE CLASS CONSISTING OF SULFITE AND THIOSULFATE IONS AND MIXTURES THEREOF, SAID COPPER SULFIDE MATERIAL BEING IMMERSED IN SAID SOLUTION AND SAID OXYGEN-CONTAINING GAS BEING PASSED THERETHROUGH.
Claim 2
Dependent Claim
86 words
IN A PROCESS FOR RECOVERING COPPER VALUES FROM COPPER SULFIDE MATERIAL, THE STEP OF CONTACTING A BATCH OF SUCH MATERIAL IN SOLID STATE UNTIL A MAJOR PORTION OF THE COPPER CONTENT HAS BEEN DISSOLVED WITH AN OXYGENCONTAINING GAS AND AN AQUEOUS, AMMONIACAL, AMMONIUM CARBONATE LEACHING SOLUTION CONTAINING INITIALLY FROM 0.1 TO 15 GRAMS PER LITER OF A PROMOTER OF THE CLASS CONSISTING OF SULFITE AND THIOSULFATE IONS AND MIXTURES THEREOF, SAID COPPER SULFIDE MATERIAL BEING IMMERSED IN SAID SOLUTION AND SAID OXYGEN-CONTAINING GAS BEING PASSED THERETHROUGH.
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) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |