US4393364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coil element
Assignee: TDK Corp
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Filing: 1981-09-08
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Granted: 1983-07-12
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Expires: 2001-09-08
Abstract
Abstract A coil element formed from a drum-shaped ferrite core on which a coil is wound, magnetic members each made of a magnetic and electrically conductive metal and formed so as to fit to the outer surface of the drum-shaped ferrite core and spaced from each other so as to be electrically insulated from each other, and connection terminals forming a part of the magnetic members connected to the ends of the coil.
Inventors
- 👤 Takayuki Suda
- 👤 Koichi Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:19
CPC Classifications
H; H01; H01F; H01F3/00; H01F3/10; H01F5/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
A coil element comprising a drum-shaped ferrite core on which a coil is wound, magnetic members each made of a magnetic and electrically conductive metal and formed so as to fit to the outer surface of said drum-shaped ferrite core and spaced from each other so as to be electrically insulated from each other, and connection terminals forming a part of said magnetic members connected to the ends of said coil.
Claim 2
Dependent Claim
71 words
A coil element comprising a drum-shaped ferrite core on which a coil is wound, magnetic members each made of a magnetic and electrically conductive metal and formed so as to fit to the outer surface of said drum-shaped ferrite core and spaced from each other so as to be electrically insulated from each other, and connection terminals forming a part of said magnetic members connected to the ends of said coil.
Claim 3
Dependent Claim
20 words
A coil element as in claim 1, in which each magnetic member is of a cross-sectional shape that is arcuate.
Claim 4
Dependent Claim
24 words
A coil element as in claim 2, in which there are two of said magnetic members each of arcuate length less than a half-circle.
Claim 5
Dependent Claim
34 words
A coil element as in claim 2 or 3, in which the radius of curvature of the arc of each of said magnetic members is slightly less than that of said drum-shaped ferrite core.
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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |