Patent US5406919A successfully refreshed from Google Patents.
US2723901A
Expired / Lapsed
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Cation exchange separation process
Assignee: Individual
•
Filing: 1950-09-07
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Granted: 1955-11-15
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Expires: 1970-09-07
Abstract
No abstract record available.
Inventors
- 👤 French T Hagemann
- 👤 Harry C Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:57
CPC Classifications
C; C01; C01G; C01G56/00; C01G56/001; C01G56/002; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
A PROCESS FOR SEPARATING ACTINIUM FROM RADIUM AND THORIUM CONTAINED IN AN AQUEOUS MINERAL ACID SOLUTION OF AN ACID CONCENTRATION OF 0.1 TO 3 N, COMPRISING PASSING SAID SOLUTION OVER CATION EXCHANGE RESIN WHEREBY ACTINIUM VALUES, RADIUM VALUES AND THORIUM VALUES ARE ADSORBED BY SAID RESIN, FRACTIONALLY ELUTING THE ADSORBED VALUES BY MEANS OF MINERAL ACID OF APPROXIMATELY THE SAME CONCENTRATION AS THAT USED IN THE ADSORPTION STEP WHEREBY SAID RADIUM VALUES ARE REMOVED FROM SAID RESIN, THEREAFTER CONTINUING ELUTION WITH AN ACID OF A CONCENTRATION ABOVE THE 3 N WHEREBY SAID ACTINIUM VALUES ARE REMOVED WHILE SAID THORIUM VALUES ARE RETAINED ON SAID RESIN.
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) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |