Patent US2759809A successfully refreshed from Google Patents.
US2759809A
Expired / Lapsed
US
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Method of roasting refractory manganese-precious metal ores
Assignee: Wyeth Holdings LLC
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Filing: 1952-12-20
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Granted: 1956-08-21
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Expires: 1972-12-20
Abstract
No abstract record available.
Inventors
- 👤 Francis M Aimone
- 👤 Tabachnick Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:58
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
IN THE PROCESS OF ROASTING REFRACTORY MANGANESEPRECIOUS METAL ORES IN THE PRESENCE OF A REDUCTANT WHICH SERVES TO REDUCE THE ORES UNDER NON-CHLORINATING CONDITIONS SO AS TO PERMIT THE RECOVERY OF THE PRECIOUS METAL CONTENT THEREOF BY CYANIDATION, THE IMPROVEMENT WHICH COMPRISES FORMING A MIXTURE CONSISTING ESSENTIALLY OF SAID ORES AND A REDUCTANT SELECTED FROM THE GROUP CONSISTING OF WOOD AND THE WOOD TAR RESULTING FROM THE DESTRUCTIVE DISTILLATION OF WOOD, HEATING SAID MIXTURE IN THE SUBSTANTIAL ABSENCE OF AIR AT A TEMPERATURE OF FROM ABOUT 400* C. TO ABOUT 700*C THE VOLATILE PRODUCTS FROM SAID REDUCTANT SERVING TO REDUCE SAID ORES IN A MANNER SO AS TO MAKE THE PRECIOUS METAL CONTENT THEREOF MORE AMENABLE TO RECOVERY BY CYANIDATION.
Claim 2
Dependent Claim
120 words
IN THE PROCESS OF ROASTING REFRACTORY MANGANESEPRECIOUS METAL ORES IN THE PRESENCE OF A REDUCTANT WHICH SERVES TO REDUCE THE ORES UNDER NON-CHLORINATING CONDITIONS SO AS TO PERMIT THE RECOVERY OF THE PRECIOUS METAL CONTENT THEREOF BY CYANIDATION, THE IMPROVEMENT WHICH COMPRISES FORMING A MIXTURE CONSISTING ESSENTIALLY OF SAID ORES AND A REDUCTANT SELECTED FROM THE GROUP CONSISTING OF WOOD AND THE WOOD TAR RESULTING FROM THE DESTRUCTIVE DISTILLATION OF WOOD, HEATING SAID MIXTURE IN THE SUBSTANTIAL ABSENCE OF AIR AT A TEMPERATURE OF FROM ABOUT 400* C. TO ABOUT 700*C THE VOLATILE PRODUCTS FROM SAID REDUCTANT SERVING TO REDUCE SAID ORES IN A MANNER SO AS TO MAKE THE PRECIOUS METAL CONTENT THEREOF MORE AMENABLE TO RECOVERY BY CYANIDATION.
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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) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |