US3842192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual insulated magnet wire
Assignee: Phelps Dodge Industries Inc
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Filing: 1973-05-17
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Granted: 1974-10-15
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Expires: 1993-05-17
Abstract
Abstract A magnet wire having surprising characteristics comprising a base insulation of a strip of wire insulating material extending longitudinally of the conductor and being wrapped around the conductor, secured at the seam with an adhesive, and a top coat of resinous material superimposed on said base insulation. The magnet wire of this construction is able to (1) withstand temperatures for short times greatly in excess of the melting temperature of the seam adhesive without the base insulation unwrapping from the conductor, and (2) exhibit improved slip, abrasion resistance, moisture resistance, and electrical insulating characteristics.
Inventors
- 👤 V Lausen
- 👤 H Mowery
- 👤 G Hilker
- 👤 C Doehrman
- 👤 M Sutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:40
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/02; H01B7/0258; H01B7/17; H01B7/29; H01B7/292
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A DUAL COATED MAGNET WIRE HAVING SURPRISING THERMAL CHARACTERISTICS, IMPROVED ABRASION RESISTANCE AND SLIP PROPERTIES, IMPROVED MOISTURE RESISTANCE, AND IMPROVED ELECTRICAL INSULATING VALUE COMPRISING AN ELONGATED MAGNET WIRE CONDUCT OR, AN ELONGATED STRIP OF INSULATING MATERIAL, SAID STRIP EXTENDING LONGITUDINALLY OF SAID CONDUCTOR AND BEING TIGHTLY WRAPPED AROUND SAID CONDUCTOR TO OVERLAP LONGITUDINALLY EXTENDING PORTIONS OF SAID STRIP ADJACENT THE OPPOSITE PERIPHERAL EDGES THEREOF AND TO EXCLUDE AIR THEREFROM THEREBY FORMING A BASE INSULATION, AN ADHESIVE ONLY BETWEEN SAID OVERLAPPED PORTIONS AND A LAYER OF RESINOUS MATERIAL SUPERIMPOSED ON SAID BASE INSULATION FORMING AN OVERCOAT THEREON, SAID INSULATED CONDUCTOR BEING ABLE TO WITHSATND TEMPERATURES IN WINDINGS FOR SHORT TIMES GREATLY IN EXCESS OF THE TEMPERATURE AT WHICH SAID RESIN MATERIAL LOSES ITS STRENGTH WITHOUT SAID STRIP UNWRAPPING.
Claim 2
Dependent Claim
127 words
A DUAL COATED MAGNET WIRE HAVING SURPRISING THERMAL CHARACTERISTICS, IMPROVED ABRASION RESISTANCE AND SLIP PROPERTIES, IMPROVED MOISTURE RESISTANCE, AND IMPROVED ELECTRICAL INSULATING VALUE COMPRISING AN ELONGATED MAGNET WIRE CONDUCT OR, AN ELONGATED STRIP OF INSULATING MATERIAL, SAID STRIP EXTENDING LONGITUDINALLY OF SAID CONDUCTOR AND BEING TIGHTLY WRAPPED AROUND SAID CONDUCTOR TO OVERLAP LONGITUDINALLY EXTENDING PORTIONS OF SAID STRIP ADJACENT THE OPPOSITE PERIPHERAL EDGES THEREOF AND TO EXCLUDE AIR THEREFROM THEREBY FORMING A BASE INSULATION, AN ADHESIVE ONLY BETWEEN SAID OVERLAPPED PORTIONS AND A LAYER OF RESINOUS MATERIAL SUPERIMPOSED ON SAID BASE INSULATION FORMING AN OVERCOAT THEREON, SAID INSULATED CONDUCTOR BEING ABLE TO WITHSATND TEMPERATURES IN WINDINGS FOR SHORT TIMES GREATLY IN EXCESS OF THE TEMPERATURE AT WHICH SAID RESIN MATERIAL LOSES ITS STRENGTH WITHOUT SAID STRIP UNWRAPPING.
Claim 3
Dependent Claim
31 words
The magnet wire of claim 1 wherein said peripheral portions of said strip overlap to an extent that the exterior of said conductor is covered by two thicknesses of said strip.
Claim 4
Dependent Claim
52 words
The magnet wire of claim 1 wherein said wire insulating material is sheet material having the desired insulating characteristics chosen from the group consisting of rope, kraft, or rag papers; polyimide, polyamide, and polyester film materials, asbestos sheet materials; fiberglass and combinations of glass and mica and asbestos cloth and mat materials.
Claim 5
Dependent Claim
28 words
The magnet wire of claim 1 wherein said resin is chosen from the group of polyester, polyimide, polyamide imides, epoxy, phenoxy, polypropylene, polycarbonates, and other film-forming resinous materials.
Claim 6
Dependent Claim
48 words
The magnet wire of claim 2 wherein said wire insulating material is a paper material which chars at temperatures from about 600*F to about 700*F, said resin has a melting temperature from about 425*F to about 536*F, said base insulation withstanding charring temperatures without unwrapping from said conductor.
Claim 7
Dependent Claim
29 words
The magnet wire of claim 2 wherein said conductor is circular in cross-section, and said strip has a width which is at least twice the circumference of said conductor.
Claim 8
Dependent Claim
35 words
The magnet wire of claim 1 wherein said conductor has a cross-section which is a parallelogram, and said strip has a width sufficiently long to at least lap itself on one side of said conductor.
Claim 9
Dependent Claim
15 words
The magnet wire of claim 1 wherein said resinous material is a heat-softenable resinous material.
Claim 10
Dependent Claim
16 words
The magnet wire of claim 5 wherein said wire insulating material is a creped paper material.
References Cited (Backward Citations)
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |