US2955913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of rare earths by solvent extraction
Assignee: Individual
•
Filing: 1953-03-27
•
Granted: 1960-10-11
•
Expires: 1973-03-27
Abstract
No abstract record available.
Inventors
- 👤 Donald F Peppard
- 👤 George W Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:36
CPC Classifications
C; C22; C22B; C22B59/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS OF SEPARATING ELEMENTS SELECTED FROM THE GROUP CONSISTING ELEMENTS SELECTED FROM THE IUM, NEODYMIUM, PROMETHIUM SAMARIUM, EUROPIUM, GADOLINIUM, TERBIUM, DYSPROSIUM, HOLMIUM, ERBIUM, THULIUM, YTTERBIUM, LUTELIUM, AND YTTRIUM FROM EACH OTHER, CONSISTING OF PROVIDING AN AQUEOUS MEDIUM HAVING FREE MINERAL ACID IN A CONCENTRATION OF AT LEAST 3 N AND A SUBSTANTIALLY WATER-IMMISCIBLE ORGANIC ALKYL PHOSPHATE-CONTAINING MEDIUM, ONE OF SAID MEDIA CONTAINING SAID ELEMENTS, CONTACTING SAID MEDIA WHEREBY THOSE OF SAID ELEMENTS WHICH HAVE THE HIGHEST ATOMIC NUMBER ARE PREFERENTIALLY HELD BY SAID ALKYL PHOSPHATE AND THE EXTRACTABILITY OF THE VARIOUS ELEMENTS BY SAID ALKYL PHOSPHATE DECREASES IN THE ORDER OF THE ATOMIC NUMBER, CONTACTING SAID ALKYL PHOSPHATE WITH APLURALITY OF AQUEOUS MINERAL ACID SOLUTIONS WHEREBY FRACTIONS OF AQUEOUS EARTH SOLUTIONS ARE FORMED, AND COLLECTING EACH FRACTION SEPARATELY.
Claim 2
Dependent Claim
129 words
A PROCESS OF SEPARATING ELEMENTS SELECTED FROM THE GROUP CONSISTING ELEMENTS SELECTED FROM THE IUM, NEODYMIUM, PROMETHIUM SAMARIUM, EUROPIUM, GADOLINIUM, TERBIUM, DYSPROSIUM, HOLMIUM, ERBIUM, THULIUM, YTTERBIUM, LUTELIUM, AND YTTRIUM FROM EACH OTHER, CONSISTING OF PROVIDING AN AQUEOUS MEDIUM HAVING FREE MINERAL ACID IN A CONCENTRATION OF AT LEAST 3 N AND A SUBSTANTIALLY WATER-IMMISCIBLE ORGANIC ALKYL PHOSPHATE-CONTAINING MEDIUM, ONE OF SAID MEDIA CONTAINING SAID ELEMENTS, CONTACTING SAID MEDIA WHEREBY THOSE OF SAID ELEMENTS WHICH HAVE THE HIGHEST ATOMIC NUMBER ARE PREFERENTIALLY HELD BY SAID ALKYL PHOSPHATE AND THE EXTRACTABILITY OF THE VARIOUS ELEMENTS BY SAID ALKYL PHOSPHATE DECREASES IN THE ORDER OF THE ATOMIC NUMBER, CONTACTING SAID ALKYL PHOSPHATE WITH APLURALITY OF AQUEOUS MINERAL ACID SOLUTIONS WHEREBY FRACTIONS OF AQUEOUS EARTH SOLUTIONS ARE FORMED, AND COLLECTING EACH FRACTION SEPARATELY.
References Cited (Backward Citations)
US2564241A
Cited
US2683655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |