US4197274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reducing plutonium
Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
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Filing: 1978-04-04
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Granted: 1980-04-08
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Expires: 1998-04-04
Abstract
Abstract A process for reducing plutonium is provided in which hydrazine is added as a reducing agent to a nitric acid solution of tetravalent plutonium in the presence of active carbon catalyst to thereby reduce tetravalent plutonium into trivalent plutonium.
Inventors
- 👤 Shinichi Nemoto
- 👤 Satoshi Ikeda
- 👤 Hiroaki Kobayashi
- 👤 Naomi Tsunoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:41
CPC Classifications
C; C01; C01G; C01G56/00; C01G56/004
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A process for reducing plutonium comprising adding hydrazine as a reducing agent to a nitric acid solution of tetravalent plutonium in the presence of active carbon catalyst to thereby reduce tetravalent plutonium into trivalent plutonium.
Claim 2
Dependent Claim
35 words
A process for reducing plutonium comprising adding hydrazine as a reducing agent to a nitric acid solution of tetravalent plutonium in the presence of active carbon catalyst to thereby reduce tetravalent plutonium into trivalent plutonium.
Claim 3
Dependent Claim
52 words
The process according to claim 1, wherein hydrazine is in an amount sufficient added enough to exist even at the completion of the reduction of plutonium (IV) to plutonium (III), so that hydrazine acts not only as a reducing agent for tetravalent plutonium but also as a stabilizer for resulting trivalent plutonium.
Claim 4
Dependent Claim
19 words
The process according to claim 1, wherein the active carbon catalyst is separated from the solution and reused repeatedly.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |