Patent US4537804A successfully refreshed from Google Patents.
US4537804A
Expired / Lapsed
US
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Corona-resistant wire enamel compositions and conductors insulated therewith
Assignee: Von Roll Isola USA Inc
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Filing: 1983-07-25
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Granted: 1985-08-27
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Expires: 2003-07-25
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
2026-10-23 15:13
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
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A method of providing a corona-resistant two stage insulated electrical conductor comprising: coating said conductor with a composition consisting essentially of a polyimide, polyester, polyamideimide, polyesterimide, or polyetherimide resin and curing said resin to form a continuous first layer around said conductor; and thereafter applying a second coating of a composition consisting essentially of a polyimide, polyamide, polyester, polyamideimide, polyesterimide or polyetherimide resin around said first layer and curing said resin to form a continuous second layer, wherein said first layer and said second layer are formed from a different resin and wherein either the first layer resin, the second layer resin, or both contains from approximately 1% to approximately 35% by weight of alumina particles of a size less than approximately 0.1 micron dispersed therein by high shear mixing.
Claim 2
Independent Claim
130 words
A method of providing a corona-resistant two stage insulated electrical conductor comprising: coating said conductor with a composition consisting essentially of a polyimide, polyester, polyamideimide, polyesterimide, or polyetherimide resin and curing said resin to form a continuous first layer around said conductor; and thereafter applying a second coating of a composition consisting essentially of a polyimide, polyamide, polyester, polyamideimide, polyesterimide or polyetherimide resin around said first layer and curing said resin to form a continuous second layer, wherein said first layer and said second layer are formed from a different resin and wherein either the first layer resin, the second layer resin, or both contains from approximately 1% to approximately 35% by weight of alumina particles of a size less than approximately 0.1 micron dispersed therein by high shear mixing.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the alumina particles comprise fumed alumina of particle size from approximately 0.005 microns to approximately 0.050 microns.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the high shear mixing is carried out by high energy mixing or high speed agitation.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said first layer is formed of a polyester resin.
Claim 6
Independent Claim
17 words
The method of claims 1 or 4 wherein said second layer is formed of a polyamide resin.
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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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |