US4379807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet wire for hermetic motors
Assignee: REA MAGNET WIRE COMPANY Inc A CORP OF
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Filing: 1981-03-13
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Granted: 1983-04-12
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Expires: 2001-03-13
Abstract
Abstract A magnet wire suitable for use in hermetic motors comprising a conductor wire, an insulating intermediate layer, a polyamide outer layer, and an organic polymeric lubricant coating on the outer layer. The lubricant has a pour point below about 15° F. (-9° C.) and wets the outer layer. A preferred lubricant is soluble in monochlorodifluoromethane and in dichlorodifluoromethane, and comprises a saturated C 2 -C 4 ether of ethylene oxide and 1,2-propylene oxide copolymers. A particularly preferred lubricant has a viscosity of about 100 to 400 SUS (21 to 87 centistokes) and a pour point of about -60° F. (-51° C.).
Inventors
- 👤 Harold R. Otis
- 👤 Charles E. Blake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:21
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H02; H02K; H02K3/00; H02K3/30; 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
138 words
A magnet wire suitable for use in an hermetic motor environment comprising a conductor wire; an insulating intermediate layer adjacent and exterior to said conductor wire; a polyamide outer layer adjacent and exterior to said intermediate layer, said polyamide being selected from the group consisting of polyundecaneamide, polydodecaneamide, and mixtures and copolymers thereof; and an organic polymeric lubricant adjacent and exterior to said outer layer, said lubricant comprising a saturated C 2 -C 4 ether of ethylene oxide and 1,2-propylene oxide copolymers, the ratio of ethylene oxide to propylene oxide being about 1:1 to 3:1; said lubricant having a pour point below about 15° F., a viscosity at 100° F. of about 100 to 400 SUS, and a molecular weight of about 200 to 800; said lubricant wetting the outer layer, and being soluble in monochlorodifluoromethane and dichlorodifluoromethane.
Claim 2
Dependent Claim
138 words
A magnet wire suitable for use in an hermetic motor environment comprising a conductor wire; an insulating intermediate layer adjacent and exterior to said conductor wire; a polyamide outer layer adjacent and exterior to said intermediate layer, said polyamide being selected from the group consisting of polyundecaneamide, polydodecaneamide, and mixtures and copolymers thereof; and an organic polymeric lubricant adjacent and exterior to said outer layer, said lubricant comprising a saturated C 2 -C 4 ether of ethylene oxide and 1,2-propylene oxide copolymers, the ratio of ethylene oxide to propylene oxide being about 1:1 to 3:1; said lubricant having a pour point below about 15° F., a viscosity at 100° F. of about 100 to 400 SUS, and a molecular weight of about 200 to 800; said lubricant wetting the outer layer, and being soluble in monochlorodifluoromethane and dichlorodifluoromethane.
Claim 3
Dependent Claim
17 words
The magnet wire of claim 1 wherein the pour point of said lubricant is about -60° F.
Claim 4
Dependent Claim
20 words
The magnet wire of claim 1 wherein said lubricant comprises a monobutyl ether of ethylene oxide and 1,2-propylene oxide copolymers.
Claim 5
Dependent Claim
29 words
The magnet wire of claim 1 wherein said magnet wire is self-bondable at elevated temperatures in the range of about 160° to 200° C., and said polyamide is polyundecaneamide.
Claim 6
Dependent Claim
17 words
The magnet wire of claim 1 wherein said intermediate layer comprises a completely organic, thermosetting, modified polyester.
Claim 7
Dependent Claim
74 words
The magnet wire of claim 1 wherein said intermediate layer comprises a blend of (a) a polymeric amide-imide-ester comprising the reaction product of (i) trimellitic anhydride, (ii) an aromatic primary diamino compound, and (iii) a polyol component, at least a portion of which is tris(2-hydroxyethyl) isocyanurate; and (b) a polyester comprising the reaction product of (i) an aromatic carboxylic acid, and (ii) a polyol component, at least a portion of which is tris(2-hydroxyethyl) isocyanurate.
Claim 8
Dependent Claim
34 words
The magnet wire of claim 1 wherein said intermediate layer comprises about 50 to 80% of the total coating thickness, and said outer layer comprises about 20 to 50% of the total coating thickness.
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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) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |