Patent US3848210A successfully refreshed from Google Patents.
US3848210A
Expired / Lapsed
US
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Miniature inductor
Assignee: VANGAURD ELECTRONICS CO US
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Filing: 1972-12-11
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Granted: 1974-11-12
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Expires: 1992-12-11
Abstract
Abstract Inductors which can be constructed in a simple and compact manner and with closely controllable and uniform characteristics, including a stack of plates of ferromagnetic material, each plate having a flat spiral coil deposited thereon. Alternate plates are formed with central holes, and an electrical conductor extends through each hole to interconnect the inner turns of a pair of coils with a minimum disturbance of the magnetic fields established by the coils. Each pair of coils which are interconnected at their inner turns spiral in opposite directions so that a current passing serially through the coils creates additive magnetic fields.
Inventors
- 👤 D Felkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:24
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F27/00; H01F27/28; H01F27/2804; H01F27/2809
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
An inductor comprising: a plurality of plates of ferromagnetic material arranged in a stack, alternate plates of said stack having central holes extending completely therethrough; and a plurality of coils disposed on said plates, each coil forming a spiral extending in substantially a plane on a face of a plate, and the coils on pairs of adjacent plates being wound in opposite directions of spiralling, the coils on the plates that have central holes extending over the edges of the holes and along the walls of the holes and the coil portions lying on the hole walls being integral with the coil portions that extend in a spiral on the face of the plate; a plurality of first connector means, each including a quantity of conductive material joined to a coil portion that lies on the wall of a plate hole and joined to the center portion of a coil on an adjacent plate; and a plurality of second connector means, each interconnecting the outer portions of the coils which lie on two plates whose coil center portions are unconnected to each other.
Claim 2
Dependent Claim
183 words
An inductor comprising: a plurality of plates of ferromagnetic material arranged in a stack, alternate plates of said stack having central holes extending completely therethrough; and a plurality of coils disposed on said plates, each coil forming a spiral extending in substantially a plane on a face of a plate, and the coils on pairs of adjacent plates being wound in opposite directions of spiralling, the coils on the plates that have central holes extending over the edges of the holes and along the walls of the holes and the coil portions lying on the hole walls being integral with the coil portions that extend in a spiral on the face of the plate; a plurality of first connector means, each including a quantity of conductive material joined to a coil portion that lies on the wall of a plate hole and joined to the center portion of a coil on an adjacent plate; and a plurality of second connector means, each interconnecting the outer portions of the coils which lie on two plates whose coil center portions are unconnected to each other.
Claim 3
Dependent Claim
53 words
The inductor described in claim 1 wherein: the central hole in each of said alternate plates has a diameter more than twice the thickness of the plate, whereby to facilitate the projection of a soldering tool or the like into the hole to form the quantity of conductive material that joins the coils.
Claim 4
Dependent Claim
23 words
The inductor described in claim 1 wherein: said first connector means is a single quantity of conductive material solidified onto the coil portions.
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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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |