Patent US3870982A successfully refreshed from Google Patents.
US3870982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnated electromagnetic coil having a layer voltage applied thereto
Assignee: Panasonic Holdings Corp
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Filing: 1973-04-02
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Granted: 1975-03-11
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Expires: 1993-04-02
Abstract
Abstract A novel electromagnetic coil is provided which is manufactured by placing and fixing an impregnable insulating material in such a manner that the insulating material contacts the whole surface of each side of an elementary electromagnetic coil consisting of a wire or self-bonding wire, to each side of which is applied a layer voltage, and then impregnating an impregnant into the elementary coil. The electromagnetic coil according to this invention ensures an improved working property in the manufacture of coils, reduction in manufacturing cost and an improved space factor.
Inventors
- 👤 Takashi Shibano
- 👤 Koichi Hirakawa
- 👤 Toshimitsu Yonehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:10
CPC Classifications
H; H01; H01F; H01F5/00; H01F5/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
An electromagnetic coil comprising an elementary electromagnetic coil composed of a self-bonding electric wire wound in the form of a plurality of layers and having no interlayer insulating paper; impregnable ring-shaped insulating sheets closely fitted to and secured on each side of said elementary coil, to which a layer voltage is applied, to allow said wire at each of said coil sides to be embedded in one of said insulating sheets; and a varnish impregnated and hardened in said elementary coil to make the electromagnetic coil void-free between said coil sides and said insulating sheets to prevent an arc discharge from being generated between coil layers along a surface of each of said coil sides.
Claim 2
Dependent Claim
115 words
An electromagnetic coil comprising an elementary electromagnetic coil composed of a self-bonding electric wire wound in the form of a plurality of layers and having no interlayer insulating paper; impregnable ring-shaped insulating sheets closely fitted to and secured on each side of said elementary coil, to which a layer voltage is applied, to allow said wire at each of said coil sides to be embedded in one of said insulating sheets; and a varnish impregnated and hardened in said elementary coil to make the electromagnetic coil void-free between said coil sides and said insulating sheets to prevent an arc discharge from being generated between coil layers along a surface of each of said coil sides.
Claim 3
Dependent Claim
115 words
An electromagnetic coil comprising an elementary electromagnetic coil composed of a self-bonding electric wire wound in the form of a plurality of layers and having no interlayer insulating paper; impregnable ring-shaped insulating sheets closely fitted to and secured on each side of said elementary coil, to which a layer voltage is applied, to allow said wire at each of said coil sides to be embedded in one of said insulating sheets; and a varnish impregnated and hardened in said elementary coil to make the electromagnetic coil void-free between said coil sides and said insulating sheets to prevent an arc discharge from being generated between coil layers along a surface of each of said coil sides.
Claim 4
Dependent Claim
115 words
An electromagnetic coil comprising an elementary electromagnetic coil composed of a self-bonding electric wire wound in the form of a plurality of layers and having no interlayer insulating paper; impregnable ring-shaped insulating sheets closely fitted to and secured on each side of said elementary coil, to which a layer voltage is applied, to allow said wire at each of said coil sides to be embedded in one of said insulating sheets; and a varnish impregnated and hardened in said elementary coil to make the electromagnetic coil void-free between said coil sides and said insulating sheets to prevent an arc discharge from being generated between coil layers along a surface of each of said coil sides.
Claim 5
Dependent Claim
52 words
An electromagnetic coil according to claim 1, further comprising another insulating sheet superimposed on said ring-shaped readily impregnable insulating sheet, said another insulating sheet having a mechanical strength greater than that of said first insulating sheet, whereby a first insulating sheet is tightly fitted and secured on each of said coil sides.
Claim 6
Dependent Claim
58 words
An electromagnetic coil according to claim 1, further including a long and narrow insulating sheet consisting of a readily impregnable nonwoven fabric, said long and narrow insulating sheet being wound around an outer surface of said coil, whereby thE joints between said first insulating sheet and said long and narrow insulating sheet are tightly connected and secured together.
References Cited (Backward Citations)
US2489867A
Cited
US2814581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |