Patent US2612441A successfully refreshed from Google Patents.
US2612441A
Expired / Lapsed
US
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Method of refining zinc ore
Assignee: Residue Co
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Filing: 1948-11-10
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Granted: 1952-09-30
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Expires: 1968-11-10
Abstract
No abstract record available.
Inventors
- 👤 Raymond F Orr
- 👤 George T Junkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:50
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/02; C22B1/00; C22B1/14; C22B1/24; C22B1/2406
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
THE PROCESS FOR THE RECOVERY OF ZINC FROM A SULPHUR-CONTAINING ZONC ORE, WHICH COMPRISES SIMULATNEOUSLY TUMBLING AND HEATING A ZINC ORE PRODUCT CONTAINING FROM ABOUT 5% TO 10% OF SULPHUR AT A SINTERING TEMPERATURE OF FROM 2000 TO 2300* F. IN THE ABSENCE OF SOLID CARBONACEOUS MATERIAL AND IN THE PRESENCE OF AN AMOUNT OF OXYGEN IN EXCESS OF THAT STOICHIOMETRICALLY REQUIRED TO OXIDIZE THE SULPHUR PRESENT TO SULPHUR DIOXIDE, CONTINUING THE TUMBLING AND HEATING UNTIL SUBSTANTIALLY ALL OF THE SULPHUR, CADMIUM, AND MOST OF THE LEAD HAVE BEEN VOLATILIZED AND RECOVERING A SINTERED PRODUCT CONTAINING ZINC OXIDE AND NOT OVER ABOUT 0.08% OF LEAD AND ONLY A TRACE OF CADMIUM, SAID PRODUCT BEING IN THE FORM OF NODULES OF SUBSTANTIALLY UNIFORM POROSITY THAT ARE PARTICULARLY AMENABLE AFTER BEING GROUND FOR REDUCTION IN A RETORT FURNCE TO RECOVER HIGH QUALITY METALLIC ZINC THEREFROM.
Claim 2
Dependent Claim
143 words
THE PROCESS FOR THE RECOVERY OF ZINC FROM A SULPHUR-CONTAINING ZONC ORE, WHICH COMPRISES SIMULATNEOUSLY TUMBLING AND HEATING A ZINC ORE PRODUCT CONTAINING FROM ABOUT 5% TO 10% OF SULPHUR AT A SINTERING TEMPERATURE OF FROM 2000 TO 2300* F. IN THE ABSENCE OF SOLID CARBONACEOUS MATERIAL AND IN THE PRESENCE OF AN AMOUNT OF OXYGEN IN EXCESS OF THAT STOICHIOMETRICALLY REQUIRED TO OXIDIZE THE SULPHUR PRESENT TO SULPHUR DIOXIDE, CONTINUING THE TUMBLING AND HEATING UNTIL SUBSTANTIALLY ALL OF THE SULPHUR, CADMIUM, AND MOST OF THE LEAD HAVE BEEN VOLATILIZED AND RECOVERING A SINTERED PRODUCT CONTAINING ZINC OXIDE AND NOT OVER ABOUT 0.08% OF LEAD AND ONLY A TRACE OF CADMIUM, SAID PRODUCT BEING IN THE FORM OF NODULES OF SUBSTANTIALLY UNIFORM POROSITY THAT ARE PARTICULARLY AMENABLE AFTER BEING GROUND FOR REDUCTION IN A RETORT FURNCE TO RECOVER HIGH QUALITY METALLIC ZINC THEREFROM.
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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) | 1955-09-30 | 1956-03-31 | 1956-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-30 | 1960-03-31 | 1960-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-30 | 1964-03-31 | 1964-09-30 | $7700.00 | Window Closed / Lapsed |