US2809092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of rhenium incidental to manufacture of mol ybdenum oxide
Assignee: Kennecott Corp
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Filing: 1955-04-11
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Granted: 1957-10-08
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Expires: 1975-04-11
Abstract
No abstract record available.
Inventors
- 👤 Stuart R Zimmerley
- 👤 Emil E Malouf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:16
CPC Classifications
C; C22; C22B; C22B61/00; C01; C01G; C01G47/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
AN INDUSTRIAL PROCESS FOR THE RECOVERY OF RHENIUM VALUES FROM MOLYBDENUM SULFIDE METALLURGICAL CONCENTRATES CONTAINING RHENIUM, COMPRISING EXTRACTING RHENIUM FROM SAID CONCENTRATES IN THE FORM OF RHENIUM OXIDE BY ROASTING SAID CONCENTRATES AT TEMPERATURE EFFECTIVE TO PRODUCE A MOLYBDENUM OXIDE CALCINE; OBTAINING A RHENIUM-BEARING SOLUTION BY TREATING WITH A LIQUID SOLVENT FOR RHENIUM ALL GASES GIVEN OFF BY THE ROASTING OF SAID CONCENTRATES AT AND ABOVE THE TEMPERATURE AT WHICH THE SULFUR BEGINS IN BURN; CLARIFYING THE RHENIUM-BEARING SOLUTION SO OBTAINED; AND TREATING THE CLARIFIED SOLUTION FOR THE SEPARATION AND RECOVERY OF RHENIUM VALUES.
Claim 2
Dependent Claim
94 words
AN INDUSTRIAL PROCESS FOR THE RECOVERY OF RHENIUM VALUES FROM MOLYBDENUM SULFIDE METALLURGICAL CONCENTRATES CONTAINING RHENIUM, COMPRISING EXTRACTING RHENIUM FROM SAID CONCENTRATES IN THE FORM OF RHENIUM OXIDE BY ROASTING SAID CONCENTRATES AT TEMPERATURE EFFECTIVE TO PRODUCE A MOLYBDENUM OXIDE CALCINE; OBTAINING A RHENIUM-BEARING SOLUTION BY TREATING WITH A LIQUID SOLVENT FOR RHENIUM ALL GASES GIVEN OFF BY THE ROASTING OF SAID CONCENTRATES AT AND ABOVE THE TEMPERATURE AT WHICH THE SULFUR BEGINS IN BURN; CLARIFYING THE RHENIUM-BEARING SOLUTION SO OBTAINED; AND TREATING THE CLARIFIED SOLUTION FOR THE SEPARATION AND RECOVERY OF RHENIUM VALUES.
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) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |