US3812232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction procedure for separating samarium from neodymium
Assignee: United States Department of the Interior
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Filing: 1972-08-15
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Granted: 1974-05-21
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Expires: 1992-08-15
Abstract
Abstract Separation of mixtures of metals, particularly complex lanthanide mixtures, in aqueous solution is accomplished by means of a process comprising total extraction of metal values into an organic extractant, and subsequent selective stripping of one or more of the metal values into an aqueous phase.
Inventors
- 👤 R Lindstrom
- 👤 D Bauer
- 👤 L Schultze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:42
CPC Classifications
C; C01; C01F; C01F17/00; C01F17/10; C01F17/17; C01F17/20; C01F17/206; C01F17/224
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
The method of claim 1 in which the organic phosphoric acid is di(2-ethylhexyl)phosphoric acid.
Claim 2
Dependent Claim
27 words
The method of claim 1 in which the stripping solution additionally contains about 100 to 200 grams per liter of ammonium chloride, ammonium nitrate or ammonium sulfate.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |