US4070524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-bonding varnish for magnetic wire comprising polyalkylenetrimellitate imide polyalkylenetrimellitate ester
Assignee: BP Corp North America Inc
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Filing: 1976-02-23
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Granted: 1978-01-24
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Expires: 1996-02-23
Abstract
Abstract Polyalkylenetrimellitate imide polyalkylenetrimellitate ester imides suitable for use as self-bonding varnish coatings for magnet wire, which can be produced by condensation of a trimellitic acid compound, a diprimary amine, an alkanol amine and a glycol.
Inventors
- 👤 Robert G. Keske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:17
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; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2936; Y10T428/294; Y10T428/2942; Y10T428/2947
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
Magnet wire bearing at least one enamel subbing layer selected from the group consisting of polyester, polyester imide, polyimide and polyamide-imide and a continuous self-bonding varnish top coat comprising a polyalkylenetrimellitate imide polyalkylenetrimellitate ester imide having a ratio of from about 1 : 19 to 19 : 1 of units A and B wherein A and B have the structures: ##STR2## and R 1 , R 2 and R 3 are independently divalent alkylene radicals.
Claim 2
Dependent Claim
75 words
Magnet wire bearing at least one enamel subbing layer selected from the group consisting of polyester, polyester imide, polyimide and polyamide-imide and a continuous self-bonding varnish top coat comprising a polyalkylenetrimellitate imide polyalkylenetrimellitate ester imide having a ratio of from about 1 : 19 to 19 : 1 of units A and B wherein A and B have the structures: ##STR2## and R 1 , R 2 and R 3 are independently divalent alkylene radicals.
Claim 3
Dependent Claim
23 words
The article of claim 1 wherein a polyamideimide enamel subbing layer is in direct contact with the top coat polymer of claim 1.
Claim 4
Dependent Claim
24 words
The magnet wire of claim 1 wherein the varnish top coat has an I.V. of at least 0.3 dl/g and R 3 comprises ethylene.
Claim 5
Dependent Claim
21 words
The magnet wire of claim 3, wherein R 1 comprises ethylene and the A : B ratio is at least 1.
Claim 6
Dependent Claim
11 words
The magnet wire of claim 4 wherein R 2 comprises hexamethylene.
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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |