Patent US3394502A successfully refreshed from Google Patents.
US3944706A
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US
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Self-bonding polyethylene trimellitate imide varnish
Assignee: Standard Oil Co
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Filing: 1974-08-01
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Granted: 1976-03-16
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Expires: 1994-08-01
Abstract
Abstract Magnet wire bearing a poly(ethylene trimellitate imide) varnish coating which is capable of forming a unitary structure after producing a fabricated article from the coated wire where the poly(ethylene trimellitate imide) cures on heating or application of electrical current.
Inventors
- 👤 Thomas S. Czajka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:02
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
22 words
Magnet wire bearing a continuous self-bonding varnish top coat comprising a poly(ethylenetrimellitate imide) having an inherent viscosity of at least 0.3 dl/g.
Claim 2
Dependent Claim
22 words
Magnet wire bearing a continuous self-bonding varnish top coat comprising a poly(ethylenetrimellitate imide) having an inherent viscosity of at least 0.3 dl/g.
Claim 3
Dependent Claim
21 words
The article of claim 1, wherein said poly(ethylenetrimellitate imide) is a homopolymer having an inherent viscosity of at least 0.4 dl/g.
Claim 4
Dependent Claim
28 words
The article of claim 2, wherein said magnet wire bears at least one enamel subbing layer selected from the group consisting of a polyester, polyesterimide, polyimide and polyamideimide.
Claim 5
Dependent Claim
21 words
The article of claim 3, wherein said poly(ethylenetrimellitate imide) is a homopolymer having an inherent viscosity of at least 0.4 dl/g.
Claim 6
Dependent Claim
19 words
The article of claim 4, wherein a polyester enamel subbing layer is in direct contact with the magnet wire.
Claim 7
Dependent Claim
25 words
The article of claim 5, wherein a polyamideimide enamel subbing layer is in direct contact with the polyester subbing layer and poly(ethylenetrimellitate imide) top coat.
Claim 8
Dependent Claim
25 words
The article of claim 5, wherein a polyimide enamel subbing layer is in direct contact with the polyester subbing layer and poly(ethylenetrimellitate imide) top coat.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |