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Patent US4227166A successfully refreshed from Google Patents.
US4227166A
Expired / Lapsed
US
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Reactor
Assignee: Nippon Kinzoku Co Ltd
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Filing: 1978-06-06
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Granted: 1980-10-07
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Expires: 1998-06-06
Abstract
Abstract A reactor comprising an annular iron core constituting a closed magnetic path and a conductor wound on the iron core. The iron core is formed of particles of iron or an iron-based magnetic material. Each particle is covered with an insulative oxide film which contains 0.3 to 0.8% of oxygen by weight based on the particle.
Inventors
- 👤 Toshihiko Tsuji
- 👤 Riyouji Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:33
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/06; H01F17/062; H01F3/00; H01F3/08; H01F37/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A reactor comprising an annular iron core constituting a closed magnetic path and a conductor wound on the annular core, said iron core being formed of particles of iron or an iron-based magnetic material each covered with an insulative oxide film which contains 0.3 to 0.8% of oxygen by weight based on the particle.
Claim 2
Dependent Claim
54 words
A reactor comprising an annular iron core constituting a closed magnetic path and a conductor wound on the annular core, said iron core being formed of particles of iron or an iron-based magnetic material each covered with an insulative oxide film which contains 0.3 to 0.8% of oxygen by weight based on the particle.
Claim 3
Dependent Claim
21 words
A reactor according to claim 1, wherein said particles are packed in a density of 2.0 to 6.5 g/cm 3 .
Claim 4
Dependent Claim
18 words
A reactor according to claim 2, wherein said particle having a Tyler mesh size of -100 to +300.
Claim 5
Dependent Claim
17 words
A reactor according to any one of the preceding claims, wherein said particles are reduced iron powder.
Claim 6
Dependent Claim
16 words
A reactor according to claim 1, wherein said oxide film is formed by heating said particles.
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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) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |