Patent US2870339A successfully refreshed from Google Patents.
US2870339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of neutron sources
Assignee: Individual
•
Filing: 1956-01-11
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Granted: 1959-01-20
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Expires: 1976-01-11
Abstract
No abstract record available.
Inventors
- 👤 John H Birden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:19
CPC Classifications
G; G21; G21G; G21G4/00; G21G4/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD FOR PREPARING A SOURCE OF NEUTRONS COMPRISING THE STEPS OF INSERTING IN A CONTAINER A QUANTITY OF POLONIUM-210, COATING BORON POWDER WITH A MATERIAL CHOSEN FROM THE GROUP CONSISTING OF SILVER, PLATINUM, AND NICKEL, INSERTING SAID COATED POWDER IN SAID CONTAINER, SEALING SAID CONTAINER TO PREVENT ESCAPE OF THE ENCLOSED MATERIAL, AND HEATING SAID CONTAINER TO A TEMPERATURE ABOVE SUBSTANTIALLY 450*C. FOR A SELECTED TIME INTERVAL TO EFFECT CHEMICAL COMBINATION OF SAID POLONIUM WITH SAID COATING MATERIAL.
Claim 2
Independent Claim
79 words
A METHOD FOR PREPARING A SOURCE OF NEUTRONS COMPRISING THE STEPS OF INSERTING IN A CONTAINER A QUANTITY OF POLONIUM-210, COATING BORON POWDER WITH A MATERIAL CHOSEN FROM THE GROUP CONSISTING OF SILVER, PLATINUM, AND NICKEL, INSERTING SAID COATED POWDER IN SAID CONTAINER, SEALING SAID CONTAINER TO PREVENT ESCAPE OF THE ENCLOSED MATERIAL, AND HEATING SAID CONTAINER TO A TEMPERATURE ABOVE SUBSTANTIALLY 450*C. FOR A SELECTED TIME INTERVAL TO EFFECT CHEMICAL COMBINATION OF SAID POLONIUM WITH SAID COATING MATERIAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |