Patent US2523892A successfully refreshed from Google Patents.
US2523892A
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Extraction process for cerium
Assignee: Individual
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Filing: 1949-05-12
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Granted: 1950-09-26
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Expires: 1969-05-12
Abstract
No abstract record available.
Inventors
- 👤 James C Warf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:05
CPC Classifications
C; C01; C01F; C01F17/00; C01F17/20; C01F17/206; C01F17/224; C01F17/235; C01F17/10; C01F17/17; C01F17/276
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
46 words
A METHOD OF SEPARATING TETRAVALENT CERIUM SALTS FROM AQUEOUS SOLUTIONS, COMPRISING ADDING MINERAL ACID TO SAID AQUEOUS SOLUTION, ADDING A SALTING-OUT AGENT, CONTACTING SAID AQUEOUS SOLUTION WITH NITROMETHANE WHEREBY SAID CERIUM SALT IS EXTRACTED BY SAID NITROMETHANE, AND SEPARATING A NITROMETHANE PHASE FROM SAID AQUEOUS PHASE.
References Cited (Backward Citations)
US2227833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |