US3259472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fraction separation of aqueous rare earths using amines
Assignee: Individual
•
Filing: 1961-10-30
•
Granted: 1966-07-05
•
Expires: 1981-10-30
Abstract
No abstract record available.
Inventors
- 👤 Andrew C Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:20
CPC Classifications
C; C01; C01F; C01F17/00; C01F17/20; C01F17/282; C01F17/10; C01F17/17; C01F17/253; C01F17/271
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A METHOD FOR THE FRACTIONAL SEPARATION OF RARE EARTHS FROM A MIXTURE THEREOF WHICH COMPRISES CONTACTING AN INITIAL AQUEOUS SULFATE SOLUTION OF THE RARE EARTH MIXTURE HAVING A PH OF FROM ABOUT 1.0 TO ABOUT 7.5 WITH A MEMBER OF THE CLASS CONSISTING OF (1) AT LEAST ONE AMINE HAVING THE FORMULA RNH2 WHEREIN R IS AN ALKYL GROUP OF FROM ABOUT 12 TO 21 CARBON ATOMS, AND (2) N-BENZYLHEPTADECYLAMINE, SAID AMINE BEING DISSOLVED IN AN ORGANIC, WATER IMMISCIBLE INERT SOLVENT COMPATIBLE WITH THE OTHER COMPONENTS PRESENT, TO FORM AN ORGANIC EXTRACT PHASE AND AN AQUEOUS RAFFINATE PHASE, EACH OF THE RARE EARTHS HAVING A DIFFERENT PERCENTAGE DISTRIBUTION BETWEEN THE OGANIC PHASE AND THE AQUEOUS PHASE EXPRESSED AS THE RATIO OF THE CONCENTRATION OF THE RARE EARTH IN THE OGANIC PHASES TO THE CONCENTRATION IN THE AQUEOUS PHASE, SAID RATIO BEING THE DISTRIBUTION COEFFICIENT K, SAID COEFFICIENT, FOR MEMBERS OF THE YTTRIUM GROUP OF RARE EARTHS; INCREASING IN THE ORDER GD>GY>YB>ER>Y AND FOR MEMBERS OF THE CERIUM GROUP OF RARE EARTHS, INCREASING IN THE ORDER
Claim 2
Independent Claim
175 words
A METHOD FOR THE FRACTIONAL SEPARATION OF RARE EARTHS FROM A MIXTURE THEREOF WHICH COMPRISES CONTACTING AN INITIAL AQUEOUS SULFATE SOLUTION OF THE RARE EARTH MIXTURE HAVING A PH OF FROM ABOUT 1.0 TO ABOUT 7.5 WITH A MEMBER OF THE CLASS CONSISTING OF (1) AT LEAST ONE AMINE HAVING THE FORMULA RNH2 WHEREIN R IS AN ALKYL GROUP OF FROM ABOUT 12 TO 21 CARBON ATOMS, AND (2) N-BENZYLHEPTADECYLAMINE, SAID AMINE BEING DISSOLVED IN AN ORGANIC, WATER IMMISCIBLE INERT SOLVENT COMPATIBLE WITH THE OTHER COMPONENTS PRESENT, TO FORM AN ORGANIC EXTRACT PHASE AND AN AQUEOUS RAFFINATE PHASE, EACH OF THE RARE EARTHS HAVING A DIFFERENT PERCENTAGE DISTRIBUTION BETWEEN THE OGANIC PHASE AND THE AQUEOUS PHASE EXPRESSED AS THE RATIO OF THE CONCENTRATION OF THE RARE EARTH IN THE OGANIC PHASES TO THE CONCENTRATION IN THE AQUEOUS PHASE, SAID RATIO BEING THE DISTRIBUTION COEFFICIENT K, SAID COEFFICIENT, FOR MEMBERS OF THE YTTRIUM GROUP OF RARE EARTHS; INCREASING IN THE ORDER GD>GY>YB>ER>Y AND FOR MEMBERS OF THE CERIUM GROUP OF RARE EARTHS, INCREASING IN THE ORDER
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |