US2539282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rare earth separation by adsorption and desorption
Assignee: Individual
•
Filing: 1949-03-23
•
Granted: 1951-01-23
•
Expires: 1969-03-23
Abstract
No abstract record available.
Inventors
- 👤 Frank H Spedding
- 👤 Adolf F Voigt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:20
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/42; C01; C01F; C01F17/00; C01F17/10; C01F17/13; C01F17/20; C01F17/253; C01F17/271; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A PROCESS FOR THE SEPARATION OF RARE EARTHS, WHICH COMPRISES CONTACTING AN AQUEOUS SOLUTION CONTAINING WATER-SOLUBLE INORGANIC SALTS OF RARE EARTHS WITH A CATION EXCHANGE RESIN TO ADSORB SAID RARE EARTHS ON THE RESIN, PASSING THROUGH A COLUMN OF THE ADSORBED RESIN AN AQUEOUS SOLUTION CONTAINING FROM 0.05% TO 5% CITRIC ACID AND HAVING A PH FROM 2.5 TO 7.0, PASSING THE ELUATE THROUGH A COLUMN OF CATION EXCHANGE RESIN, AND COLLECTING SUCCESSIVE PORTIONS OF THE RESULTANT ELUATE.
Claim 2
Dependent Claim
78 words
A PROCESS FOR THE SEPARATION OF RARE EARTHS, WHICH COMPRISES CONTACTING AN AQUEOUS SOLUTION CONTAINING WATER-SOLUBLE INORGANIC SALTS OF RARE EARTHS WITH A CATION EXCHANGE RESIN TO ADSORB SAID RARE EARTHS ON THE RESIN, PASSING THROUGH A COLUMN OF THE ADSORBED RESIN AN AQUEOUS SOLUTION CONTAINING FROM 0.05% TO 5% CITRIC ACID AND HAVING A PH FROM 2.5 TO 7.0, PASSING THE ELUATE THROUGH A COLUMN OF CATION EXCHANGE RESIN, AND COLLECTING SUCCESSIVE PORTIONS OF THE RESULTANT ELUATE.
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) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |