US4400430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet wires
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1982-07-26
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Granted: 1983-08-23
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Expires: 2002-07-26
Abstract
Abstract A magnet wire comprising a layer of baked enamel formed on the conductor either directly or through another insulation is disclosed. At least the outermost layer of the wire has an insulation coating formed by applying and baking an enamel composition consisting essentially of a polyamide at least one molecule of which is terminated with a straight alkyl group having 21 or more carbon atoms.
Inventors
- 👤 Masayoshi Miyake
- 👤 Isao Ueoka
- 👤 Munetaka Kawaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:21
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/308; C; C08; C08G; C08G69/00; C08G69/48; H01B3/303; H01B3/305; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A magnet wire, comprising: an electrical conductor core; and at least one outermost insulation layer surrounding the core, the layer being formed by applying and baking an enamel composition consisting essentially of a polyamide polymer at least one molecule of which is terminated with a straight chain alkyl group having 21 or more carbon atoms, the straight chain alkyl group being contained in the polyamide in an amount of 0.3 to 3.5% by weight.
Claim 2
Dependent Claim
74 words
A magnet wire, comprising: an electrical conductor core; and at least one outermost insulation layer surrounding the core, the layer being formed by applying and baking an enamel composition consisting essentially of a polyamide polymer at least one molecule of which is terminated with a straight chain alkyl group having 21 or more carbon atoms, the straight chain alkyl group being contained in the polyamide in an amount of 0.3 to 3.5% by weight.
Claim 3
Dependent Claim
38 words
A magnet wire as claimed in claim 1, wherein the electrical conductor is in direct contact with an inner insulation layer, the inner insulation layer being in direct contact with and being surrounded by the outermost insulation layer.
Claim 4
Dependent Claim
30 words
A magnet wire as claimed in claim 1 or 2, wherein the straight chain alkyl group is contained in the polyamide in an amount of 0.3 to 2.5% by weight.
Claim 5
Dependent Claim
15 words
A magnet wire as claimed in claim 1 or 2, wherein the polyamide is nylon-6,6.
Claim 6
Dependent Claim
15 words
A magnet wire as claimed in claim 1 or 2, wherein the polyamide is nylon-6.
Claim 7
Dependent Claim
21 words
A magnet wire as claimed in claim 1 or 2, wherein the polyamide is a copolymerized nylon including a nylon-12 unit.
Claim 8
Dependent Claim
58 words
A magnet wire as claimed in claim 1 or 2, wherein the polyamide is terminated with a straight alkyl group having 27 or more carbon atoms, said enamel being a polymer solution produced by reacting a polyamide with a carboxylic acid having a straight alkyl group of 27 or more carbon atoms in a phenolic solvent under heating.
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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |