Patent US2839359A successfully refreshed from Google Patents.
US2839359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating chromiumbearing ores
Assignee: Diamond Shamrock Corp
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Filing: 1953-08-21
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Granted: 1958-06-17
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Expires: 1973-08-21
Abstract
No abstract record available.
Inventors
- 👤 Clayton L Dunning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:36
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
IN A PROCESS FOR TREATING CHROMIUM-BEARING ORES FOR THE PURPOSE OF RECOVERING CHROMIUM VALUES IN GOOD DEGREE OF PURITY WHICH ORES CONTAIN CONTAMINANTS IN THE FORM OF VANADIUM AND ALUMINUM COMPOUNDS, AND WHEREIN THE SAID CHROMIUM VALUES AND IMPURITIES ARE REMOVED FROM THE ORE BY FIRST ROASTING SAID ORE, AND THEN LEACHING THEM THERFROM TO FORM A LIQUOR, THE IMPROVEMENT THAT COMPRISES TREATING SAID LIQUOR TO EFFECT REMOVAL OF SUBSTANTIALLY OF ALL OF SAID ALUMINUM IMPURITIES AND THEREAFTER EFFECTING REMOVAL OF VANADIUM IMPURITIES AT A PH OF BETWEEN ABOUT 11.5-13 BY SUPPLYING CALCIUM OXIDE IN THE SAID LIQUOR WHILE HEATING THE SAID LIQUOR AT A TEMPERATURE OF ABOUT 50* TO 70*C. FOR FROM ABOUT 30 TO ABOUT 60 MINUTES, AND SEPARATING THE PURIFIED LIQUOR FROM THE PRECIPITATE SO FORMED.
Claim 2
Dependent Claim
129 words
IN A PROCESS FOR TREATING CHROMIUM-BEARING ORES FOR THE PURPOSE OF RECOVERING CHROMIUM VALUES IN GOOD DEGREE OF PURITY WHICH ORES CONTAIN CONTAMINANTS IN THE FORM OF VANADIUM AND ALUMINUM COMPOUNDS, AND WHEREIN THE SAID CHROMIUM VALUES AND IMPURITIES ARE REMOVED FROM THE ORE BY FIRST ROASTING SAID ORE, AND THEN LEACHING THEM THERFROM TO FORM A LIQUOR, THE IMPROVEMENT THAT COMPRISES TREATING SAID LIQUOR TO EFFECT REMOVAL OF SUBSTANTIALLY OF ALL OF SAID ALUMINUM IMPURITIES AND THEREAFTER EFFECTING REMOVAL OF VANADIUM IMPURITIES AT A PH OF BETWEEN ABOUT 11.5-13 BY SUPPLYING CALCIUM OXIDE IN THE SAID LIQUOR WHILE HEATING THE SAID LIQUOR AT A TEMPERATURE OF ABOUT 50* TO 70*C. FOR FROM ABOUT 30 TO ABOUT 60 MINUTES, AND SEPARATING THE PURIFIED LIQUOR FROM THE PRECIPITATE SO FORMED.
References Cited (Backward Citations)
US613157A
Cited
US1430864A
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US2583591A
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US2612435A
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US2576445A
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US2697650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |