US4012556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-bonding varnish for magnet wires comprising a polyalkylenetrimellitate ester imide
Assignee: BP Corp North America Inc
•
Filing: 1976-02-23
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Granted: 1977-03-15
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Expires: 1996-02-23
Abstract
Abstract Magnet Wire Bearing a Self-Bonding Poly(alkylenetrimellitate ester imide) varnish coating which is capable of forming a unitary structure after producing a fabricated article from the coated wire wherein the varnish layer bonds on heating.
Inventors
- 👤 Robert G. Keske
- 👤 James R. Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:36
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2936; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
Magnet wire bearing a continuous self-bonding varnish top coat comprising a poly(alkylenetrimellitate ester imide) having an I.V. of at least 0.3 dl/g of the structure ##STR2##wherein each R and each R' is independently an alkylene group of 2-12 carbon atoms and n is a number sufficient to provide a polymer having an I.V. of at least 0.3 dl/g.
Claim 2
Dependent Claim
58 words
Magnet wire bearing a continuous self-bonding varnish top coat comprising a poly(alkylenetrimellitate ester imide) having an I.V. of at least 0.3 dl/g of the structure ##STR2##wherein each R and each R' is independently an alkylene group of 2-12 carbon atoms and n is a number sufficient to provide a polymer having an I.V. of at least 0.3 dl/g.
Claim 3
Dependent Claim
18 words
The article of claim 1 wherein said poly(alkylenetrimellitate ester imide) has an I.V. of at least 0.4 dl/g.
Claim 4
Dependent Claim
9 words
The article of claim 1, wherein R' is ethylene.
Claim 5
Dependent Claim
9 words
The article of claim 3 wherein R is ethylene.
Claim 6
Dependent Claim
9 words
The article of claim 3 wherein R is hexamethylene.
Claim 7
Dependent Claim
28 words
The article of claim 1, wherein said magnet wire bears at least one enamel subbing layer selected from the group consisting of a polyester, polyesterimide, polyimide and polyamideimide.
Claim 8
Dependent Claim
19 words
The article of claim 6 wherein a polyester enamel subbing layer is in direct contact with the magnet wire.
Claim 9
Dependent Claim
26 words
The article of claim 7 wherein a polyamideimide enamel subbing layer is in direct contact with the polyester subbing layer and poly(alkylenetrimellitate ester imide) top coat.
Claim 10
Dependent Claim
26 words
The article of claim 7, wherein a polyimide enamel subbing layer is in direct contact with the polyester subbing layer and poly(alkylenetrimellitate ester imide) top coat.
Claim 11
Dependent Claim
15 words
The article of claim 1 wherein the magnet wire is in a fabricated unbonded form.
Claim 12
Dependent Claim
25 words
The method of converting the article of claim 10 into a unitary structure, which comprises bonding the fabricated element at a temperature of 150°-300° C.
References Cited (Backward Citations)
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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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |