Patent US4488964A successfully refreshed from Google Patents.
US4488964A
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Apparatus for removing a radioactive substance from a molten metal
Assignee: Toshiba Corp
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Filing: 1978-09-25
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Granted: 1984-12-18
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Expires: 1998-09-25
Abstract
Abstract An apparatus for removing a radioactive substance from a molten metal which comprises a cold trap for crystallizing an impurity out of the molten metal; a radioactive substance-adsorbing unit which communicates with the cold trap and in which a radioactive substance-adsorbing material is filled with a specific surface area of at least 10 cm 2 /cm 3 to eliminate a radioactive substance from the impurity; means for heating the molten metal conducted from the cold trap to the radioactive substance-adsorbing unit; and means for controlling the temperature of the heating means by measuring the temperature of the cold trap and radioactive substance-adsorbing unit.
Inventors
- 👤 Norimasa Mitsutsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:05
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/02; G; G21; G21C; G21C19/00; G21C19/28; G21C19/30; G21C19/307; G21C19/31; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/12; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
An apparatus for removing a radioactive substance from a molten metal which comprises a cold trap for crystallizing an impurity out of the molten metal; a radioactive substance-adsorbing unit in which a radioactive substance-adsorbing material is filled with a specific surface area of at least 10 cm 2 /cm 3 ; means for conducting the molten metal from the cold trap to the radioactive substance-adsorbing unit; means positioned between said cold trap and said adsorbing unit for heating the molten metal delivered from the cold trap to the radioactive substance-adsorbing unit; and means adapted for controlling the temperature of the heating means by measuring the temperature of the cold trap and radioactive substance-adsorbing unit, whereby the temperature in said adsorbing unit is maintained above the minimum temperature in said cold trap.
Claim 2
Independent Claim
131 words
An apparatus for removing a radioactive substance from a molten metal which comprises a cold trap for crystallizing an impurity out of the molten metal; a radioactive substance-adsorbing unit in which a radioactive substance-adsorbing material is filled with a specific surface area of at least 10 cm 2 /cm 3 ; means for conducting the molten metal from the cold trap to the radioactive substance-adsorbing unit; means positioned between said cold trap and said adsorbing unit for heating the molten metal delivered from the cold trap to the radioactive substance-adsorbing unit; and means adapted for controlling the temperature of the heating means by measuring the temperature of the cold trap and radioactive substance-adsorbing unit, whereby the temperature in said adsorbing unit is maintained above the minimum temperature in said cold trap.
Claim 3
Dependent Claim
30 words
The radioactive substance-removing apparatus according to claim 1, wherein the radioactive substance-adsorbing unit is formed of a plurality of parallel-arranged radioactive substance-adsorbing chambers which separately communicate with the cold trap.
Claim 4
Dependent Claim
38 words
The radioactive substance-removing apparatus according to claim 1 or 2 wherein the radioactive surface-adsorbing material is selected from a group consisting of stainless steel, iron, nickel, chromium, cobalt, manganese, an alloy of these metals, β-alumina and active carbon.
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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) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |