US2583591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recovery of vanadium-free chromate
Assignee: Diamond Shamrock Corp
•
Filing: 1948-11-13
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Granted: 1952-01-29
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Expires: 1968-11-13
Abstract
No abstract record available.
Inventors
- 👤 Tom S Perrin
- 👤 James N Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:17
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE METHOD OF PURIFYING ALKALI METAL CHROMATE SOLUTIONS WITH RESPECT TO VANADIUM, WHICH INCLUDES THE STEPS OF PROVIDING A SORUCE OF LEAD IONS IN AN AQUEOUS SOLUTION COMPRISING CHROMATES AND VANADATES, SAID SOURCE OF LEAD IONS BEING ADDED TO THE SOLUTION IN AN AMOUNT SUFFICIENT TO PROVIDE 15-30 PARTS BY WEIGHT OF LEAD PER PART BY WEIGHT OF VANADATE CALCULATED AS VO3 TO COPRECIPITATE SUBSTANTIALLY ALL OF THE VANADATE IONS AND A MINOR PROPORATION OF THE CHROMATE IONS FROM SAID SOLUTION AS THEIR LEAD SALTS, AND SEPARATELY RECOVERING THE SUBSTANTIALLY VANADIUMFREE CHROMATE SOLUTION.
Claim 2
Independent Claim
93 words
THE METHOD OF PURIFYING ALKALI METAL CHROMATE SOLUTIONS WITH RESPECT TO VANADIUM, WHICH INCLUDES THE STEPS OF PROVIDING A SORUCE OF LEAD IONS IN AN AQUEOUS SOLUTION COMPRISING CHROMATES AND VANADATES, SAID SOURCE OF LEAD IONS BEING ADDED TO THE SOLUTION IN AN AMOUNT SUFFICIENT TO PROVIDE 15-30 PARTS BY WEIGHT OF LEAD PER PART BY WEIGHT OF VANADATE CALCULATED AS VO3 TO COPRECIPITATE SUBSTANTIALLY ALL OF THE VANADATE IONS AND A MINOR PROPORATION OF THE CHROMATE IONS FROM SAID SOLUTION AS THEIR LEAD SALTS, AND SEPARATELY RECOVERING THE SUBSTANTIALLY VANADIUMFREE CHROMATE SOLUTION.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-28 | 1955-07-30 | 1956-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-28 | 1959-07-30 | 1960-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-28 | 1963-07-30 | 1964-01-29 | $7700.00 | Window Closed / Lapsed |