Patent US3303140A successfully refreshed from Google Patents.
US3303140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radioactive materials of low surface area
Assignee: Pullman Inc
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Filing: 1961-12-05
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Granted: 1967-02-07
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Expires: 1981-12-05
Abstract
No abstract record available.
Inventors
- 👤 Heinemann Heinz
- 👤 John W Kraus
- 👤 Marshall L Spector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:12
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; G21F9/301; G21F9/302
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE PROCESS WHICH COMPRISES: FORMING A MIXTURE OF IRON OXIDE AND AN ELEMENT IN ITS ELEMENTAL STATE SELECTED FROM THE GROUP CONSISTING OF SILICON AND ALUMINUM AND MIXTURES THEREOF WHEREIN THE IRON OXIDE IS IN AT LEAST A 2.5:1 WEIGHT RATIO WITH THE ELEMENTAL PORTION OF THE MIXTURE; PREHEATING THE MIXTURE TO A TEMPERATURE BELOW IGNITION AND REACTING A RADIOACTIVE ELEMENT WITH THE HEATED MIXTURE BY IGNITING THE MIXTURE IN THE PRESENCE OF SID RADIOACTIVE ELEMENT TO PRODUCE A CRYSTALLINE MASS HAVING A SURFACE AREA LESS THAN 0.01 SQUARE METER PER GRAM WHEREIN THE RADIOACTIVE ELEMENT IS CHEMICALLY COMBINED WITHIN THE MIXTURE.
Claim 2
Dependent Claim
102 words
THE PROCESS WHICH COMPRISES: FORMING A MIXTURE OF IRON OXIDE AND AN ELEMENT IN ITS ELEMENTAL STATE SELECTED FROM THE GROUP CONSISTING OF SILICON AND ALUMINUM AND MIXTURES THEREOF WHEREIN THE IRON OXIDE IS IN AT LEAST A 2.5:1 WEIGHT RATIO WITH THE ELEMENTAL PORTION OF THE MIXTURE; PREHEATING THE MIXTURE TO A TEMPERATURE BELOW IGNITION AND REACTING A RADIOACTIVE ELEMENT WITH THE HEATED MIXTURE BY IGNITING THE MIXTURE IN THE PRESENCE OF SID RADIOACTIVE ELEMENT TO PRODUCE A CRYSTALLINE MASS HAVING A SURFACE AREA LESS THAN 0.01 SQUARE METER PER GRAM WHEREIN THE RADIOACTIVE ELEMENT IS CHEMICALLY COMBINED WITHIN THE MIXTURE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |