US2697650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating chromium and vanadium bearing material
Assignee: Bethlehem Steel Corp
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Filing: 1952-11-19
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Granted: 1954-12-21
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Expires: 1972-11-19
Abstract
No abstract record available.
Inventors
- 👤 Hixson Arthur Norman
- 👤 Russel J Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:01
CPC Classifications
C; C01; C01G; C01G37/00; C22; C22B; C22B34/00; C22B34/20; C22B34/22; C22B34/30; C22B34/32
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
86 words
A PROCESS FOR THE SEPARATION OF VANADIUM FROM CHROMIUM IN A SOLUTION CONTAINING THESE ELEMENTS, THE AMOUNT OF CHROMIUM CONSIDERABLY EXCEEDING THE AMOUNT OF VANADIUM, COMPRISING THE STEPS OF ADDING AN ALKALI METAL HYDROXIDE AND CALCIUM HYDROXIDE TO PRECIPITATE A CALCIUM-VANADIUM COMPOUND FROM THE SOLUTION, THE AMOUNT OF ALKALI METAL HYDROXIDE ADDED BEING SUFFICIENT TO GIVE THE SOLUTION A PH OF FROM 10.5 TO 11.5 AND THE AMOUNT OF CALCIUM HYDROXIDE BEING AT LEAST SUFFICIENT TO COMBINE STOICHIOMETRICALLY WITH ALL OF THE VANADIUM IN THE SOLUTION.
References Cited (Backward Citations)
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US1430864A
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US2320661A
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US2357988A
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US2576445A
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US2587552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |