US4378407A
Expired / Lapsed
US
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Magnet wire
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1980-12-31
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Granted: 1983-03-29
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Expires: 2000-12-31
Abstract
Abstract A magnet wire comprising a conductor having thereon an outermost insulating wire enamel layer, either directly or over another insulating layer, said wire enamel consisting essentially of a polyamideimide wherein either one or both ends of at least one polyamideimide molecule is a terminal linear alkyl group having at least 21 carbon atoms. The magnet wire has a high resistance to refrigerant as well as to thermal or mechanical damage and has a high lubricity.
Inventors
- 👤 Teruyuki Yamamoto
- 👤 Masayoshi Miyake
- 👤 Munetaka Kawaguchi
- 👤 Hirohiko Nakabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G73/00; C08G73/06; C08G73/10; C08G73/14; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; H01B3/308; H01F; H01F5/00; H01F5/06; H02; H02K; H02K3/00; H02K3/30; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
46 words
A magnet wire comprising a conductor having thereon an outermost insulating wire enamel layer, said wire enamel consisting essentially of a polyamideimide wherein either one or both ends of at least one polyamideimide molecule is a terminal linear alkyl group having at least 21 carbon atoms.
Claim 2
Dependent Claim
46 words
A magnet wire comprising a conductor having thereon an outermost insulating wire enamel layer, said wire enamel consisting essentially of a polyamideimide wherein either one or both ends of at least one polyamideimide molecule is a terminal linear alkyl group having at least 21 carbon atoms.
Claim 3
Dependent Claim
20 words
A magnet wire according to claim 1 wherein said additional insulating layer is one for use in a refrigerant-resistant motor.
Claim 4
Dependent Claim
16 words
A magnet wire according to claim 1 wherein said additional insulating layer is a polyester imide.
Claim 5
Dependent Claim
27 words
A magnet wire according to claim 1 wherein the terminal linear alkyl groups are linked to the main portion of the polyamideimide molecules through an amide bond.
Claim 6
Dependent Claim
27 words
A magnet wire according to claim 1 wherein the terminal linear alkyl groups are linked to the main portion of the polyamideimide molecules through an imide bond.
Claim 7
Dependent Claim
27 words
A magnet wire according to claim 1 wherein the terminal linear alkyl groups are linked to the main portion of the polyamideimide molecules through an ester bond.
Claim 8
Dependent Claim
27 words
A magnet wire according to claim 1 wherein the terminal linear alkyl groups are linked to the main portion of the polyamideimide molecules through a urethane bond.
Claim 9
Dependent Claim
27 words
A magnet wire according to claim 1 wherein the terminal linear alkyl groups are linked to the main portion of the polyamideimide molecules through a urea bond.
Claim 10
Dependent Claim
30 words
A magnet wire according to claim 1, 4, 5, 6, 7 or 8 wherein the content of terminal linear alkyl group in the polyamideimide is from 0.3 to 3.2 wt%.
Claim 11
Dependent Claim
29 words
A magnet wire according to claim 1, 4, 5, 6, 7 or 8 wherein the content of linear alkyl group in the polyamideimide is from 0.3 to 2.3 wt%.
Claim 12
Dependent Claim
38 words
A magnet wire according to claim 1 wherein the polyamideimide is prepared by reacting a polybasic acid that contains a tribasic acid anhydride and a polyisocyanate compound with a linear carboxylic acid having at least 22 carbon atoms.
Claim 13
Dependent Claim
16 words
A magnet wire according to claim 11 wherein the tribasic acid anhydride is trimellitic acid anhydride.
Claim 14
Dependent Claim
13 words
A magnet wire according to claim 11 wherein the polyisocyanate compound is diphenylmethane-4,4'-diisocyanate.
Claim 15
Dependent Claim
15 words
A magnet wire according to claim 11 wherein the linear carboxylic acid is docosanoic acid.
Claim 16
Dependent Claim
15 words
A magnet wire according to claim 11 wherein the linear carboxylic acid is octacosanoic acid.
Claim 17
Dependent Claim
24 words
A magnetic wire according to claim 1, further comprising an additional insulating layer positioned between said wire and said outermost insulating wire enamel layer.
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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) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |