Patent US2965447A successfully refreshed from Google Patents.
US2965447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid process for production of high grade molybdenum oxide
Assignee: Kennecott Corp
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Filing: 1957-10-10
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Granted: 1960-12-20
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Expires: 1977-10-10
Abstract
No abstract record available.
Inventors
- 👤 Stuart R Zimmerley
- 👤 Emil E Malouf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:19
CPC Classifications
C; C01; C01G; C01G39/00; C01G39/02; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A PROCESS FOR PRODUCING HIGH GRADE MOLYBDENUM OXIDE, COMPRISING ROASTING A MOLYBDENUM SULFIDE CONCENTRATE CONTAINING IMPURITIES, INCLUDING AT LEAST COPPER AND IRON, AT A TEMPERATURE BELOW THAT AT WHICH MOLYBDENUM OXIDE VOLATILIZES TO OXIDIZE A LARGE PORTION OF ITS SULFUR CONTENT IN THE FORM OF A GASEOUS EFFLUENT, THROUGHLY WETTING THE CALCINE FROM SUCH ROASTING OPERATION WITH A CONCENTRATED, STRONG, MINERAL ACID, HEATING THE WETTED CALCINE IN THE PRESENCE OF OXYGEN AT A TEMPERATURE WITHIN THE RANGE OF FROM APPROXIMATELY 300 DEGREES TO APPROXIMATELY 400 DEGREE CENTIGRADE FOR A SUFFICIENT LENGTH OF TIME TO OXIDIZE THE MOLYBDENUM SULFIDE AND SOLUBILIZE AT LEAST THE COPPER AND IRON PRESENT, LEACHING THE RESULTING CALCINE WITH WATER UNDER CONDITIONS OF AGITATION TO PRODUCE AN AQUEOUS SOLUTION CONTAINING MOLYBDENUM OXIDE AND WATER SOLUBLE IMPURITIES, SEPARATING THE PREGNANT LEACH SOLUTION FROM THE INSOLUBLE RESIDUE, AND RECOVERING MOLYBDENUM OXIDE AS A HIGH GRADE PRODUCT FREE OF SAID WATER SOLUBLE IMPURITIES BY PRECIPITATING SAID MOLYBDENUM OXIDE FROM SAID PREGNANT LEACH SOLUTION ON STANDING, AND FREEING THE PRECIPITATE FROM THE SOLUTION.
Claim 2
Dependent Claim
172 words
A PROCESS FOR PRODUCING HIGH GRADE MOLYBDENUM OXIDE, COMPRISING ROASTING A MOLYBDENUM SULFIDE CONCENTRATE CONTAINING IMPURITIES, INCLUDING AT LEAST COPPER AND IRON, AT A TEMPERATURE BELOW THAT AT WHICH MOLYBDENUM OXIDE VOLATILIZES TO OXIDIZE A LARGE PORTION OF ITS SULFUR CONTENT IN THE FORM OF A GASEOUS EFFLUENT, THROUGHLY WETTING THE CALCINE FROM SUCH ROASTING OPERATION WITH A CONCENTRATED, STRONG, MINERAL ACID, HEATING THE WETTED CALCINE IN THE PRESENCE OF OXYGEN AT A TEMPERATURE WITHIN THE RANGE OF FROM APPROXIMATELY 300 DEGREES TO APPROXIMATELY 400 DEGREE CENTIGRADE FOR A SUFFICIENT LENGTH OF TIME TO OXIDIZE THE MOLYBDENUM SULFIDE AND SOLUBILIZE AT LEAST THE COPPER AND IRON PRESENT, LEACHING THE RESULTING CALCINE WITH WATER UNDER CONDITIONS OF AGITATION TO PRODUCE AN AQUEOUS SOLUTION CONTAINING MOLYBDENUM OXIDE AND WATER SOLUBLE IMPURITIES, SEPARATING THE PREGNANT LEACH SOLUTION FROM THE INSOLUBLE RESIDUE, AND RECOVERING MOLYBDENUM OXIDE AS A HIGH GRADE PRODUCT FREE OF SAID WATER SOLUBLE IMPURITIES BY PRECIPITATING SAID MOLYBDENUM OXIDE FROM SAID PREGNANT LEACH SOLUTION ON STANDING, AND FREEING THE PRECIPITATE FROM THE SOLUTION.
References Cited (Backward Citations)
US1911505A
Cited
US1399554A
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US1895811A
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US1911943A
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US2501952A
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US2579107A
Cited
US2809092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |