Patent US4272749A successfully refreshed from Google Patents.
US4272749A
Expired / Lapsed
US
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Reactor core of insulated iron powder
Assignee: Nippon Kinzoku Co Ltd
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Filing: 1979-08-30
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Granted: 1981-06-09
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Expires: 1999-08-30
Abstract
Abstract A reactor formed by winding a conductor on a core which is formed by using mutually insulated particles of iron powder to provide a closed magnetic path. The reactor is less in leakage flux and has its inductance value accurately held over a wide frequency range.
Inventors
- 👤 Toshihiko Tuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:56
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/06; H01F17/062; H01F3/00; H01F3/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
A reactor core comprising: a body made of particles of iron power providing a closed magnetic path, said particles being insulated from each other, said body having a density of from 2 to 6.5 g/cm 3 , and said particles having a Tyler mesh size from 100 to 300.
Claim 2
Dependent Claim
49 words
A reactor core comprising: a body made of particles of iron power providing a closed magnetic path, said particles being insulated from each other, said body having a density of from 2 to 6.5 g/cm 3 , and said particles having a Tyler mesh size from 100 to 300.
Claim 3
Dependent Claim
13 words
A reactor core according to claim 1, comprising a casing surrounding said body.
Claim 4
Dependent Claim
16 words
A reactor core according to claim 1, wherein said particles are bonded together by a resin.
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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) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |