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US2525035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radioactive device and method of making the same
Assignee: Canadian Radium and Uranium Corp
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Filing: 1944-12-15
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Granted: 1950-10-10
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Expires: 1964-12-15
Abstract
No abstract record available.
Inventors
- 👤 Joris George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:46
CPC Classifications
G; G21; G21G; G21G4/00; G21G4/04; G21G4/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A METHOD OF MAKING A SILVER CARRIER WHICH HAS AN EXTERNAL ADHERENT LAYER, SAID LAYER BEING A MIXTURE OF METALLIC SILVER AND RADIUM CARBONATE, THE MASS OF THE SILVER BEING GREATER THAN THE MASS OF THE RADIUM IN SAID RADIUM CARBONATE, WHICH CONSISTS IN CO-PRECIPITATING SILVER CARBONATE AND RADIUM CARBONATE FROM AN AQUEOUS SOLUTION OF SILVER NITRATE AND RADIUM NITRATE BY MEANS OF A WATER-SOLUBLE CARBONATE, THE SILVER IN SAID SILVER NITRATE AND THE RADIUM IN SAID RADIUM CARBONATE BEING IN THE DESIRED FINAL PROPORTIONX IN SAID LAYER, SEPARATING SAID CO-PRECIPITATE FROM THE MOTHER LIQUID, DRYING SAID SEPARATED CO-PRECIPITATE, MOISTENING SAID DRY CO-PRECIPITATE WITH A FLUID TO FORM A PASTE, SAID FLUIID BEING VOLATILE AT A TEMPERATURE AT WHICH SILVER CARBONATE IS DECOMPOSED TO METALLIC SILVER, APPLYING SAID PASTE ADHERENTY TO A RESPECTIVE SURFACE OF SAID SILVER CARRIER, HEATING SAID CARRIER AND SAID PASTE TO SAID TEMPERATURE IN ORDER TO PRODUCE METALLIC SILVER IN SITU FROM SAID SILVER CARBONATE AND TO BOND SUCH PRODUCED SILVER TO SAID SILVER CARRIER, SAID TEMPERATURE BEING BELOW THE TEMPERATURE AT WHICH RADIUM CARBONATE IS DECOMPOSED.
Claim 2
Independent Claim
181 words
A METHOD OF MAKING A SILVER CARRIER WHICH HAS AN EXTERNAL ADHERENT LAYER, SAID LAYER BEING A MIXTURE OF METALLIC SILVER AND RADIUM CARBONATE, THE MASS OF THE SILVER BEING GREATER THAN THE MASS OF THE RADIUM IN SAID RADIUM CARBONATE, WHICH CONSISTS IN CO-PRECIPITATING SILVER CARBONATE AND RADIUM CARBONATE FROM AN AQUEOUS SOLUTION OF SILVER NITRATE AND RADIUM NITRATE BY MEANS OF A WATER-SOLUBLE CARBONATE, THE SILVER IN SAID SILVER NITRATE AND THE RADIUM IN SAID RADIUM CARBONATE BEING IN THE DESIRED FINAL PROPORTIONX IN SAID LAYER, SEPARATING SAID CO-PRECIPITATE FROM THE MOTHER LIQUID, DRYING SAID SEPARATED CO-PRECIPITATE, MOISTENING SAID DRY CO-PRECIPITATE WITH A FLUID TO FORM A PASTE, SAID FLUIID BEING VOLATILE AT A TEMPERATURE AT WHICH SILVER CARBONATE IS DECOMPOSED TO METALLIC SILVER, APPLYING SAID PASTE ADHERENTY TO A RESPECTIVE SURFACE OF SAID SILVER CARRIER, HEATING SAID CARRIER AND SAID PASTE TO SAID TEMPERATURE IN ORDER TO PRODUCE METALLIC SILVER IN SITU FROM SAID SILVER CARBONATE AND TO BOND SUCH PRODUCED SILVER TO SAID SILVER CARRIER, SAID TEMPERATURE BEING BELOW THE TEMPERATURE AT WHICH RADIUM CARBONATE IS DECOMPOSED.
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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) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |