US3787555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering chromium values from chrome ore
Assignee: Honeywell International Inc
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Filing: 1972-02-16
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Granted: 1974-01-22
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Expires: 1992-02-16
Abstract
Abstract CHROMIUM VALUES FROM CHROME ORE ARE SOLUBILZED IN AN AQUEOUS SOLUTION WHICH COMPRISES DIGESTING THE ORE WITH AN AQUEOUS CHROMIC ACID SOLUTION AT ELEVATED TEMPERATURES TO PRODUCE A SOLUTION OF THE DICHROMATES OF THE METAL VALUES IN THE CHROME ORE, SEPARATING THE DIGESTD SOLUTION FROM THE INSOLUBLE METARIAL, OXIDIZING THE TRIVALENT CHROMIUM PRESENT IN THE DIGESTED SOLUTION TO THE HEXAVALENT STATE, AND RECOVERING THE CHROME VALUES. OXIDATION OF THE CHROME ORE PRIOR TO THE DIGESTION STEP SUFFICIENT TO OXIDIZE AT LEAST 40% OF THE FERROUS IRON TO THE FERRIC STATE IN THE ORE INCREASES THE DISSOLUTION RATE OF THE METAL VALUES IN THE CHROME ORE.
Inventors
- 👤 C Bruen
- 👤 C Wamser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:34
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |