US2615798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of cerium with an organic solvent
Assignee: Individual
•
Filing: 1951-03-06
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Granted: 1952-10-28
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Expires: 1971-03-06
Abstract
No abstract record available.
Inventors
- 👤 Edgar C Pitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:53
CPC Classifications
C; C01; C01F; C01F17/00; C01F17/10; C01F17/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS FOR THE SEPARATION OF CERIUM VALUES FROM AN AQUEOUS SOLUTION CONTAINING CERIUM NITRATE IN A TRACER CONCENTRATION, COMPRISING INCORPORATING AN ALKALI METAL DICHROMATE TO OBTAIN A CONCENTRATION OF FROM 0.0004 TO 0.01 M, CONTACTING THE RESULTANT AQUEOUS SOLUTION WITH A SUBSTANTIALLY WATER-IMMISCIBLE ALIPHATIC KETONE, AND SEPARATING AN AQUEOUS PHASE AND A KETONE EXTRACT PHASE CONTAINING CERIUM VALUES.
Claim 2
Dependent Claim
59 words
A PROCESS FOR THE SEPARATION OF CERIUM VALUES FROM AN AQUEOUS SOLUTION CONTAINING CERIUM NITRATE IN A TRACER CONCENTRATION, COMPRISING INCORPORATING AN ALKALI METAL DICHROMATE TO OBTAIN A CONCENTRATION OF FROM 0.0004 TO 0.01 M, CONTACTING THE RESULTANT AQUEOUS SOLUTION WITH A SUBSTANTIALLY WATER-IMMISCIBLE ALIPHATIC KETONE, AND SEPARATING AN AQUEOUS PHASE AND A KETONE EXTRACT PHASE CONTAINING CERIUM VALUES.
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) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |