US4228146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing radioactive carbon powder
Assignee: Individual
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Filing: 1978-10-27
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Granted: 1980-10-14
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Expires: 1998-10-27
Abstract
Abstract Carbon powder, placed in a hermetically closed apparatus under vacuum together with radium ore, adsorbs radon gas emanating from the radium ore thus producing a radioactive carbonaceous material, the radioactivity of which is due to the presence of adsorbed radon. The radioactive carbon powder thus obtained has excellent therapeutical efficacy and is suitable for a variety of applications because of the mild radioactivity of radon. Radium ore permits substantially limitlessly repeated production of the radioactive carbon powder.
Inventors
- 👤 Yuzo Imamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:05
CPC Classifications
A; A61; A61N; A61N5/00; A61N5/10; A61N5/1001; A61N5/1028; A61N5/1029; C; C01; C01B; C01B32/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A method for the production of radioactive carbon powder with radon gas absorbed therein and capable of radiating alpha-rays using an apparatus comprising a receptacle with a removable lid capable of being closed in an airtight fashion and with means to extract air from the receptacle, comprising: affixing grains of radium ore contained in a bonding agent to the inside of the lid; placing preheated carbon powder into the receptacle; spraying water on the radium grains; pressing the lid against the receptacle, before the powder is cooled, to make the receptacle airtight; and extracting air from the airtight receptacle.
Claim 2
Independent Claim
99 words
A method for the production of radioactive carbon powder with radon gas absorbed therein and capable of radiating alpha-rays using an apparatus comprising a receptacle with a removable lid capable of being closed in an airtight fashion and with means to extract air from the receptacle, comprising: affixing grains of radium ore contained in a bonding agent to the inside of the lid; placing preheated carbon powder into the receptacle; spraying water on the radium grains; pressing the lid against the receptacle, before the powder is cooled, to make the receptacle airtight; and extracting air from the airtight receptacle.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |