US2530616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of vanadium and chromium
Assignee: NL Industries Inc
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Filing: 1948-09-17
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Granted: 1950-11-21
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Expires: 1968-09-17
Abstract
No abstract record available.
Inventors
- 👤 Franklin L Kingsbury
- 👤 Frank J Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:56
CPC Classifications
C; C01; C01G; C01G31/00; C01G31/02; C01G37/00; C01G37/02; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
METHOD FOR RECOVERING VANADIUM AND CHROMIUM VALUES FROM IRON SALT SOLUTIONS CONTAINING THE SAME WHEREIN THE IRON IS IN FERROUS CONDITIONS WHICH COMPRISES ADDING TO SAID SOLUTION AN ALKALINE REAGENT TO REDUCE THE ACIDITY THEREOF TO FROM ABOUT PH=2 TO NOT MROE THAN PH=5, ADDING AN OXIDIZING AGENT IN AMOUNT SELECTIVELY TO OXIDIZE THE VANADIUM AND CHROMIUM BUT NOT THE IRON, ADJUSTING AND MAINTAINING THE SOLUTION TO AN ACIDITY THEREOF FROM ABOUT PH=4 TO PH=5 TO PRECIPITATE THE VANADIUM AND CHROMIUM VALUES, AND SEPARATING THE PRECIPITATED VALUES FROMT HE SUPERNATANT LIQUOR.
Claim 2
Dependent Claim
91 words
METHOD FOR RECOVERING VANADIUM AND CHROMIUM VALUES FROM IRON SALT SOLUTIONS CONTAINING THE SAME WHEREIN THE IRON IS IN FERROUS CONDITIONS WHICH COMPRISES ADDING TO SAID SOLUTION AN ALKALINE REAGENT TO REDUCE THE ACIDITY THEREOF TO FROM ABOUT PH=2 TO NOT MROE THAN PH=5, ADDING AN OXIDIZING AGENT IN AMOUNT SELECTIVELY TO OXIDIZE THE VANADIUM AND CHROMIUM BUT NOT THE IRON, ADJUSTING AND MAINTAINING THE SOLUTION TO AN ACIDITY THEREOF FROM ABOUT PH=4 TO PH=5 TO PRECIPITATE THE VANADIUM AND CHROMIUM VALUES, AND SEPARATING THE PRECIPITATED VALUES FROMT HE SUPERNATANT LIQUOR.
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) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |