US3340202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered pollucite radioactive source and method of production
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1966-06-17
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Granted: 1967-09-05
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Expires: 1986-06-17
Abstract
No abstract record available.
Inventors
- 👤 Olombel Andre
- 👤 Perebaskine Cecile
- 👤 Raggenbass Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:57
CPC Classifications
G; G21; G21G; G21G4/00; G21G4/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
64 words
A METHOD OF PREPARATION OF SINTERED POLLUCITE COMPRISING THE SUCCESSIVE STEPS OF MIXING A COLLOIDAL SOLUTION OF SILICA AND SOLUTIONS OF NITRATES OF CAESIUM AND OF ALUMINUM IN STOICHIOMETRIC QUANTITIES, THEN EVAPORATING THE RESULTING MIXTURE TO DRYNESS WITH STIRRING OF SAID MIXTURE, THEN HEATING SAID MIXTURE TO A TEMPERATURE BELOW 1000*C. AND THEN COMPACTING AND SINTERING SAID MIXTURE AT A TEMPERATURE OF ABOUT 1600*C.
Claim 2
Independent Claim
64 words
A METHOD OF PREPARATION OF SINTERED POLLUCITE COMPRISING THE SUCCESSIVE STEPS OF MIXING A COLLOIDAL SOLUTION OF SILICA AND SOLUTIONS OF NITRATES OF CAESIUM AND OF ALUMINUM IN STOICHIOMETRIC QUANTITIES, THEN EVAPORATING THE RESULTING MIXTURE TO DRYNESS WITH STIRRING OF SAID MIXTURE, THEN HEATING SAID MIXTURE TO A TEMPERATURE BELOW 1000*C. AND THEN COMPACTING AND SINTERING SAID MIXTURE AT A TEMPERATURE OF ABOUT 1600*C.
Claim 3
Dependent Claim
15 words
A RADIOACTIVE SOURCE CONTAINING CEASIUM-137 COMPRISING SINTERED POLLUCITE PREPARED BY THE METHOD OF CLAIM 1.
References Cited (Backward Citations)
US2835699A
Cited
US3114716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |