US2698290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isotope of curium having a mass number of 238
Assignee: Individual
•
Filing: 1950-01-27
•
Granted: 1954-12-28
•
Expires: 1970-01-27
Abstract
No abstract record available.
Inventors
- 👤 Glenn T Seaborg
- 👤 Jr Kenneth Street
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:00
CPC Classifications
G; G21; G21G; G21G1/00; G21G1/04; G21G1/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
IN A PROCESS FOR PRODUCING CURIUM ISOTOPE 238, THE STEPS COMPRISING BOMBARDING A QUANTITY OF PLUTONIUM ISOTOPE 239 WITH 80 MEV. ALPHA PARTICLES THEREBY PRODUCING THEREIN SAID CURIUM ISOTOPE 238 TOGETHER WITH VARIOUS RARE EARTH FISSION PRODUCTS, DISSOLVING THE PRODUCT MIXTURE WITH CONCENTRATED NITRIC ACID CONTAINING BORIC ACID, OXIDIZING SAID SOLUTION TO PLACE THE PLUTONIUM IN THE VI OXIDATION STATE, PRECIPITATING LANTHANUM FLUORIDE FROM SAID SOLUTION THEREBY CARRYING THE RARE EARTH-AMERICIUM-CURIUM FRACTION AWAY FROM THE PLUTONIUM IN THE SOLUTION, DISSOLVING THE PRECIPITATE IN A MIXTURE OF BORIC AND NITRIC ACIDS, TREATING
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) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |