US2687953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammoniacal leaching process
Assignee: Calumet and Hecla Inc
•
Filing: 1952-05-31
•
Granted: 1954-08-31
•
Expires: 1972-05-31
Abstract
No abstract record available.
Inventors
- 👤 Herman C Kenny
- 👤 Helmer A Abramson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B30/00; C22B30/02; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A PROCESS FOR RECOVERING COPPER VALUES FROM COPPER SULFIDE MATERIAL COMPRISING THE STEPS OF CONTACTING FINELY DIVIDED, SOLID, COPPER SULFIDE MATERIAL WITH AN OXYGEN-CONTAINING GAS AND AN AQUEOUS AMMONIACAL SOLUTION OF THE CLASS CONSISTING OF AQUEOUS AMMONIACAL AMMONIUM CARBONATE SOLUTIONS AND AQUEOUS AMMONICAL AMMONIUM SULFATE SOLUTIONS CONTAINING FROM 5 TO 100 GRAMS PER LITER OF COPPER ION AND LESS THAN 15 GRAMS PER LITER OF THIOSULFATE ION, IN A BODY OF REACTION MIXTURE, MAINTAINING SUCH COPPER ION AND THIOSULFATE ION CONCENTRATIONS IN SAID REACTION MIXTURE BY CONTINUSOULY SEGREGATING A PORTION OF THE LIQUID PHASE OF SAID REACTION MIXTURE, REDUCING THE THIOSULFATE ION CONCENTRATION THEREOF BY OXIDATION THEREOF WITH SAID COPPER SULTAINING GAS OUT OF CONTACT WITH SAID COPPER SULFIDE MATERIAL AND RETURNING AT LEAST A PART OF SAID PORTION OF THE LIQUID PHASE TO SAID REACTION MIXTURE, THE PORTION OF THE LIQUID PHASE SO SEGREGATED, OXIDIZED AND RETURNED BEING OF SUCH QUANTITY AND THIOSULFATE ION CONCENTRATION AS TO
Claim 2
Dependent Claim
158 words
A PROCESS FOR RECOVERING COPPER VALUES FROM COPPER SULFIDE MATERIAL COMPRISING THE STEPS OF CONTACTING FINELY DIVIDED, SOLID, COPPER SULFIDE MATERIAL WITH AN OXYGEN-CONTAINING GAS AND AN AQUEOUS AMMONIACAL SOLUTION OF THE CLASS CONSISTING OF AQUEOUS AMMONIACAL AMMONIUM CARBONATE SOLUTIONS AND AQUEOUS AMMONICAL AMMONIUM SULFATE SOLUTIONS CONTAINING FROM 5 TO 100 GRAMS PER LITER OF COPPER ION AND LESS THAN 15 GRAMS PER LITER OF THIOSULFATE ION, IN A BODY OF REACTION MIXTURE, MAINTAINING SUCH COPPER ION AND THIOSULFATE ION CONCENTRATIONS IN SAID REACTION MIXTURE BY CONTINUSOULY SEGREGATING A PORTION OF THE LIQUID PHASE OF SAID REACTION MIXTURE, REDUCING THE THIOSULFATE ION CONCENTRATION THEREOF BY OXIDATION THEREOF WITH SAID COPPER SULTAINING GAS OUT OF CONTACT WITH SAID COPPER SULFIDE MATERIAL AND RETURNING AT LEAST A PART OF SAID PORTION OF THE LIQUID PHASE TO SAID REACTION MIXTURE, THE PORTION OF THE LIQUID PHASE SO SEGREGATED, OXIDIZED AND RETURNED BEING OF SUCH QUANTITY AND THIOSULFATE ION CONCENTRATION AS TO
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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) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |