US3775175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enameled wire lubricated with polyethylene
Assignee: Westinghouse Electric Corp
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Filing: 1972-03-15
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Granted: 1973-11-27
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Expires: 1992-03-15
Abstract
Abstract A lubricated enameled wire is made by preparing a dispersion of polyethylene containing a volatile suspending agent, mixing the dispersion with a wire enamel, applying the mixture to a wire, and heating the mixture to a degree sufficient to evaporate the suspending agent and to cause the wire enamel to harden when cooled. The polyethylene migrates to the surface to form a slippery coating which is an integral part of the wire enamel. The coating protects the enamel from damage particularly when the wire is wound with automatic machinery. The enamel retains its original physical, electrical, thermal, and other properties and its ability to be bonded with varnish.
Inventors
- 👤 J Merian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:47
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/065; H01B3/00; H01B3/18; H01B3/30; H01B7/00; H01B7/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
18 words
A lubricated enameled wire according to claim 1 wherein said polyethylene has a density of at least 0.97.
Claim 2
Dependent Claim
12 words
about 1 part by weight of a long-chain unsaturated drying oil; anD
Claim 3
Dependent Claim
83 words
about 2 to 30 parts by weight of a hydrocarbon fraction boiling in the range 110*-250*C; B. heating said composition to dissolve said polyethlene and form a solution; C. cooling said solution rapidly under high-shear conditions to form a dispersion; D. mixing 0.2 to 2 weight percent of said dispersion with 98 to 99.8 weight percent of a liquid, heatcurable electrically insulating resinous enamel composition, thereby producing a dispersion-treated wire-enamel formulation; and E. applying to and curing onto wire said dispersion-treated wire-enamel formulation.
Claim 4
Dependent Claim
37 words
A lubricated enameled wire according to claim 2 wherein said polyethylene has an average particle size of 50 microns maximum direction, a melt viscosity of at least 50 centipoises, and a melt index of at least six.
Claim 5
Dependent Claim
15 words
A lubricated enameled wire according to claim 1 wherein said dispersion includes a drying oil.
Claim 6
Dependent Claim
61 words
A lubricated enameled wire according to claim 4 wherein said dispersion is about 1 to 2 parts by weight polyethylene, about 1 part by weight drying oil, and about 2 to 30 parts by weight volatile suspending agent, and about 0.2 to 2 weight percent of said dispersion is mixed with about 98 to 98.8 weight percent of said wire enamel.
Claim 7
Dependent Claim
25 words
A lubricated enameled wire according to claim 1 wherein said volatile suspending agent is a mixture of hydrocarbons boiling in the range 110* to 250*C.
Claim 8
Dependent Claim
13 words
A lubricated enameled wire made by A. preparing a composition consisting essentially of
Claim 9
Dependent Claim
41 words
A lubricated enameled wire according to claim 1 wherein said wire enamel is a formulation selected from the group consisting of polyvinyl acetals, aromatic polyamides, epoxies, polyurethanes, polyesters, polyamide-imides, polyester-amide-imides, polyvinyl-butyral, silicone-based resins and polymeric-amide-imide ester blended with an ester-urethane isocyanate.
Claim 10
Dependent Claim
21 words
A lubricated enameled wire according to claim 8 wherein said wire enamel is a polymeric-amide-imide ester blended with an ester-urethane isocyanate.
References Cited (Backward Citations)
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Cited
US3413148A
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US3330684A
Cited
US3399071A
Cited
US3555113A
Cited
US3649441A
Cited
US3652471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |