Patent US3533913A successfully refreshed from Google Patents.
US3533913A
Expired / Lapsed
US
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Radioisotope heat source
Assignee: Boeing North American Inc
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Filing: 1967-02-06
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Granted: 1970-10-13
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Expires: 1987-02-06
Abstract
No abstract record available.
Inventors
- 👤 William V Botts
- 👤 Ronald Y Parkinson
- 👤 John S Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:23
CPC Classifications
G; G21; G21G; G21G4/00; G21G4/04; G21G4/06; G21H; G21H1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2894320A
Cited
US2863816A
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US3262858A
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US3291700A
Cited
US3330974A
Cited
US3331748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |