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Patent US3677958A successfully refreshed from Google Patents.
US3677958A
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Radioactive heat source
Assignee: United States Atomic Energy Commission
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Filing: 1968-11-06
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Granted: 1972-07-18
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Expires: 1988-11-06
Abstract
Abstract A RADIOACTIVE HEAT SOURCE COMPRISING A POROUS ELEMENT FORMED BY COMPACTING INTERMIXED RATIOS OF MATRIX AND RARE EARTH TYPE PARTICLES, AND IMPREGNATING WITH POLONIUM RADIOISOTOPE, WITH PORES OR INTERSTICES OF THE ELEMENT PROVIDING FOR ESCAPE OF HELIUM WHICH MAY RESULT FROM RADIOISOTOPE DECAY.
Inventors
- 👤 Frank D Lonadier
- 👤 Carl J Kershner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:42
CPC Classifications
G; G21; G21H; G21H1/00; G21G; G21G4/00; G21G4/04
Claims Analysis
Total Claims: 0
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |