Patent US5534997A successfully refreshed from Google Patents.
Patent US4394636A successfully refreshed from Google Patents.
US4394636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structure of a transformer
Assignee: TDK Corp
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Filing: 1981-05-01
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Granted: 1983-07-19
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Expires: 2001-05-01
Abstract
Abstract A transformer having a main winding and a control winding has a pair of E-shaped cores (10, 11), and an I-shaped third core (13) positioned on one E-shaped core (10). A small groove (14) is provided on the base plate (10c) of the first E-shaped core (10). A control winding (12) is wound on the I-shaped core (13) so that the winding (2) rests in the groove 14. Those cores (10, 11, 13) are made of ferrite material. Thus, both the main winding and the control winding can be produced using a winding machine.
Inventors
- 👤 Imaizumi Hiraku
- 👤 Mitsui Tadashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:52
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/26; H01F27/263; H01F29/00; H01F29/14; H01F29/143; H01F38/00; H01F38/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
A transformer comprising two E-shaped core parts, each having a back from one side of which projects at right angles thereto three spaced-apart legs, positioned with the extremities of the legs abutting such as to define a center leg and a leg at either side thereof between the backs of the E-shaped core parts, a spool on which is wound a coil positioned on the center leg and an I-shaped core part of a length and breadth corresponding to the length and breadth of the backs of the E-shaped core parts positioned in engagement with the back of one of the E-shaped core parts, means defining an open groove at the interfaces exclusively in one of said interfaces, a coil wound on the I-shaped core part, the windings of which are received in said groove and a C-shaped, elastically-engageable clamp means encompassing the core parts and clamping the E-shaped core parts in engagement with each other and the I-shaped core part in engagement with the back of said one of the E-shaped core parts.
Claim 2
Dependent Claim
174 words
A transformer comprising two E-shaped core parts, each having a back from one side of which projects at right angles thereto three spaced-apart legs, positioned with the extremities of the legs abutting such as to define a center leg and a leg at either side thereof between the backs of the E-shaped core parts, a spool on which is wound a coil positioned on the center leg and an I-shaped core part of a length and breadth corresponding to the length and breadth of the backs of the E-shaped core parts positioned in engagement with the back of one of the E-shaped core parts, means defining an open groove at the interfaces exclusively in one of said interfaces, a coil wound on the I-shaped core part, the windings of which are received in said groove and a C-shaped, elastically-engageable clamp means encompassing the core parts and clamping the E-shaped core parts in engagement with each other and the I-shaped core part in engagement with the back of said one of the E-shaped core parts.
Claim 3
Dependent Claim
26 words
A transformer according to claim 1 wherein the groove is in the face of the I-shaped core part facing the back of the E-shaped core part.
Claim 4
Dependent Claim
30 words
A transformer according to claim 1 wherein the groove is in the planar surface of the back of the E-shaped core part upon which the I-shaped core part is positioned.
Claim 5
Dependent Claim
36 words
A transformer according to claim 1 wherein there are flanges at opposite ends of the spool to one of which there is affixed a plurality of connector pins for coupling the transformer to an external circuit.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |