Patent US3316059A successfully refreshed from Google Patents.
US3316059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the acid oxidation of lead and zinc sulphides
Assignee: Viridian Inc Canada
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Filing: 1962-10-29
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Granted: 1967-04-25
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Expires: 1982-10-29
Abstract
No abstract record available.
Inventors
- 👤 Vizsolyi Andrew Imre
- 👤 Veltman Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:17
CPC Classifications
C; C01; C01G; C01G21/00; C01G21/20; C01G9/00; C01G9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
IN A PROCESS FOR THE OXIDATION OF MINERAL SULPHIDES SUBSTANTIALLY FREE OF OXIDIZABLE IRON WHICH CONTAIN VALUES OF AT LEAST ONE NON-FERROUS METAL SELECTED FROM THE GROUP CONSISTING OF LEAD AND ZINC IN WHICH THE MINERAL SULPHIDES ARE REACTED AT A TEMPERATURE ABOVE ABOUT 90%C. BUT BELOW THE MELTING POINT OF SULPHUR IN AN AQUEOUS SULPHURIC ACID SOLUTION WITH A FREE OXYGEN BEARING GAS, THE IMPROVEMENT WHICH COMPRISES THE STEP OF PROVIDING IN SAID AQUEOUS SOLUTION FROM AN EXTRANEOUS SOURCE OXIDIZABLE IRON IN AMOUNT AT LEST SUFFICIENT TO PROVIDE A TOTAL OXIDIZABLE IRON CONTENT IN SAID SOLUTION EQUIVALENT TO ABOUT 5% BY WEIGHT OF THE LEAD PLUS ZINC CONTENT OF SAID MINERAL SULPHIDES.
Claim 2
Dependent Claim
113 words
IN A PROCESS FOR THE OXIDATION OF MINERAL SULPHIDES SUBSTANTIALLY FREE OF OXIDIZABLE IRON WHICH CONTAIN VALUES OF AT LEAST ONE NON-FERROUS METAL SELECTED FROM THE GROUP CONSISTING OF LEAD AND ZINC IN WHICH THE MINERAL SULPHIDES ARE REACTED AT A TEMPERATURE ABOVE ABOUT 90%C. BUT BELOW THE MELTING POINT OF SULPHUR IN AN AQUEOUS SULPHURIC ACID SOLUTION WITH A FREE OXYGEN BEARING GAS, THE IMPROVEMENT WHICH COMPRISES THE STEP OF PROVIDING IN SAID AQUEOUS SOLUTION FROM AN EXTRANEOUS SOURCE OXIDIZABLE IRON IN AMOUNT AT LEST SUFFICIENT TO PROVIDE A TOTAL OXIDIZABLE IRON CONTENT IN SAID SOLUTION EQUIVALENT TO ABOUT 5% BY WEIGHT OF THE LEAD PLUS ZINC CONTENT OF SAID MINERAL SULPHIDES.
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) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |