US4406697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radioactive 57 Co source
Assignee: PARAK FRITZ
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Filing: 1981-01-21
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Granted: 1983-09-27
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Expires: 2001-01-21
Abstract
Abstract A radioactive 57 Co source consists of the intermetallic composition CoSb 3 which emits an energetically non-disintegrated 14.4 KeV line. This composition is strictly stoichiometrical and may be dissolved in excess Sb. The atom percent proportion of 57 Co may be up to 25%.
Inventors
- 👤 Fritz Parak
- 👤 Jorg Loock
- 👤 Runar Kouzmine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
G; G21; G21G; G21G4/00; G21G4/04; C; C01; C01G; C01G51/00; C01G51/08; C01G51/085
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
37 words
A process for preparing a radioactive 57 Co source comprising contacting 57 CoCl 2 with Sb, reducing said 57 CoCl 2 , and melting said Sb to form an alloy containing said composition 57 CoSb 3 .
Claim 2
Dependent Claim
37 words
A process for preparing a radioactive 57 Co source comprising contacting 57 CoCl 2 with Sb, reducing said 57 CoCl 2 , and melting said Sb to form an alloy containing said composition 57 CoSb 3 .
Claim 3
Dependent Claim
43 words
The process according to claim 1 comprising the further step of heating said composition to a temperature and for a time sufficient to evaporate said Sb to form a composition wherein only the Sb bound to 57 Co as 57 CoSb 3 remains.
Claim 4
Dependent Claim
24 words
The process according to claim 2 wherein said 57 CoCl 2 is reduced in a stream of hydrogen to form the 57 Co metal.
Claim 5
Dependent Claim
22 words
The process according to claim 3 wherein said 57 CoCl 2 is reduced in a stream of hydrogen at about 300° C.
Claim 6
Dependent Claim
15 words
The process according to claim 1 wherein said Sb is melted at about 770° C.
References Cited (Backward Citations)
US3549354A
Cited
DE2820754A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-26 | 1987-03-28 | 1987-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-26 | 1991-03-28 | 1991-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-26 | 1995-03-28 | 1995-09-27 | $7700.00 | Window Closed / Lapsed |