Patent US3691498A successfully refreshed from Google Patents.
US3691498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin impregnated transformer coil assembly
Assignee: Cooper Industries LLC
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Filing: 1971-03-24
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Granted: 1972-09-12
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Expires: 1991-03-24
Abstract
Abstract A transformer coil assembly having a strip conductor wound to form a plurality of helix-shaped winding layers positioned concentrically and impregnated and encapsulated with a solidified unitary resinous mass. The strip conductor has a strip of conductive material and a strip of insulative material engaging one of the faces of the conductive strip and extending beyond both edges of the conductive strip which separates and electrically insulates adjacent turns in a layer and adjacent layers from each other. The resinous mass includes a filler which is unevenly distributed within the resin such that pure resin is in the smaller interstices of the coil, between turns in a layer and between turns of adjacent layers and a resin and filler in the larger interstices of the coil and encapsulating the coil.
Inventors
- 👤 Martin I Zwelling
- 👤 Robert W Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:43
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/327; H01F5/00; H01F5/06; H01F2027/328
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
In an electrical winding assembly, the combination comprising an electrical coil having a continuous conductor including a conductive strip and an insulative strip in facing engagement along their length and being helically wound to form a plurality of superimposed winding layers each having a plurality of axially displaced conductor turns, said coil including a plurality of various size interstices and each two adjacent turns in a layer having a space therebetween, and a resin material comprising a single mixture of a solidified resin and filler, said filler being unevenly distributed in said resin, said resin and filler occupying the larger interstices and spaces of said coil and said resin occupying the smaller interstices and spaces of said coil whereby said turns and layers are insulated from each other and held rigidly in place.
Claim 2
Dependent Claim
133 words
In an electrical winding assembly, the combination comprising an electrical coil having a continuous conductor including a conductive strip and an insulative strip in facing engagement along their length and being helically wound to form a plurality of superimposed winding layers each having a plurality of axially displaced conductor turns, said coil including a plurality of various size interstices and each two adjacent turns in a layer having a space therebetween, and a resin material comprising a single mixture of a solidified resin and filler, said filler being unevenly distributed in said resin, said resin and filler occupying the larger interstices and spaces of said coil and said resin occupying the smaller interstices and spaces of said coil whereby said turns and layers are insulated from each other and held rigidly in place.
Claim 3
Dependent Claim
142 words
In an electrical winding assembly, the combination comprising an electrical coil having a conductor including an insulative strip and conductive strip in facing engagement along their length, said conductive strip being narrower than the insulative strip and being spaced from the edges of said insulative strip, said conductor being helically wound to form a plurality of superimposed winding layers each having a plurality of overlapped conductor turns, the turns of successive adjacent layers being wound in opposite axially advancing directions whereby the turns of adjacent coil layers cross, a plurality of interstices within said coil formed by said winding layers and conductor turns and a resin material comprising a single solidified mixture of a resin and filler, said resin and filler impregnating the larger interstices of said coil and enveloping said coil and said resin impregnating the smaller interstices of said coil.
Claim 4
Dependent Claim
142 words
In an electrical winding assembly, the combination comprising an electrical coil having a conductor including an insulative strip and conductive strip in facing engagement along their length, said conductive strip being narrower than the insulative strip and being spaced from the edges of said insulative strip, said conductor being helically wound to form a plurality of superimposed winding layers each having a plurality of overlapped conductor turns, the turns of successive adjacent layers being wound in opposite axially advancing directions whereby the turns of adjacent coil layers cross, a plurality of interstices within said coil formed by said winding layers and conductor turns and a resin material comprising a single solidified mixture of a resin and filler, said resin and filler impregnating the larger interstices of said coil and enveloping said coil and said resin impregnating the smaller interstices of said coil.
Claim 5
Dependent Claim
14 words
The combination according to claim 1 wherein said resin and filler envelopes said coil.
Claim 6
Dependent Claim
114 words
The combination according to claim 3 wherein said coil has two axial end faces, said faces each having an uneven surface comprising a plurality of edges and flat surfaces of said conductor turns, said edges and flat surfaces of said conductor turns, said edges and flat surfaces at each end face defining spaces extending into said end faces a depth not less than the sum of the axial displacement of the conductor turns comprising said uneven surfaces and the distance between the edges of the conductive and insulative strips of a conductor turn, said resin and filler material being tightly gripped within said spaces and being the only electrical insulation on said end faces.
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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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |