Patent US4503124A successfully refreshed from Google Patents.
US4503124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona-resistant wire enamel compositions and conductors insulated therewith
Assignee: Von Roll Isola USA Inc
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Filing: 1983-03-30
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Granted: 1985-03-05
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Expires: 2003-03-30
Abstract
Abstract A corona-resistant wire enamel composition is described comprising a polyimide, polyamide, polyester, polyamideimide, polyesterimide, or polyetherimide resin and from about 1% to about 35% by weight of dispersed alumina particles of a finite size less than about 0.1 micron, the alumina particles being dispersed therein by high shear mixing. A method of providing corona resistant one and two-stage insulations for an electrical conductor employing the above compositions and an electrical conductor insulated with a one or two-stage coating of the wire enamel compositions are also disclosed.
Inventors
- 👤 John J. Keane
- 👤 Denis R. Pauze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:45
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/303; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/2949; Y10T428/2958
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
An electrical conductor coated with a corona-resistant wire enamel comprising a polyimide, polyesterimide or polyamideimide resin or mixtures thereof containing from about 1% to about 35% by weight of alumina particles having a size less than about 0.1 micron, said alumina particles having been dispersed in said resin by high shear mixing.
Claim 2
Dependent Claim
52 words
An electrical conductor coated with a corona-resistant wire enamel comprising a polyimide, polyesterimide or polyamideimide resin or mixtures thereof containing from about 1% to about 35% by weight of alumina particles having a size less than about 0.1 micron, said alumina particles having been dispersed in said resin by high shear mixing.
Claim 3
Dependent Claim
21 words
The electrical conductor of claim 1 wherein the alumina particles have a size of from about 0.005 to about 0.05 microns.
Claim 4
Dependent Claim
12 words
The electrical conductor of claim 1 wherein the resin is a polyimide.
Claim 5
Dependent Claim
12 words
The electrical conductor of claim 1 wherein the resin is a polyesterimide.
Claim 6
Dependent Claim
11 words
The electrical conductor of claim 1 wherein the resin is polyamideimide.
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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) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |