US4124419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-bonding varnish for magnet wire and magnets produced using said
Assignee: Standard Oil Co
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Filing: 1977-07-07
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Granted: 1978-11-07
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Expires: 1997-07-07
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
2026-11-08 14:48
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: 5
Claim 1
Independent Claim
124 words
The method of producing a magnet wire bearing a continuous self-bonded varnish top coat comprising applying 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 1 and R 3 are independently divalent alkylene radicals, varnish top coat to a magnet wire bearing at least one enamel subbing layer selected from the group consisting of a polyester, polyesterimide, polyimide and polyamide-imide, drying the polyalkylenetrimellitate imide polyalkylenetrimellitate ester imide coating, winding the wire to form a wound magnet, fabricating the wound magnet into an electrical component and bonding the polyalkylenetrimellitate imide polyalkylenetrimellitate ester imide varnish together to form a unitary electrical structure.
Claim 2
Independent Claim
124 words
The method of producing a magnet wire bearing a continuous self-bonded varnish top coat comprising applying 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 1 and R 3 are independently divalent alkylene radicals, varnish top coat to a magnet wire bearing at least one enamel subbing layer selected from the group consisting of a polyester, polyesterimide, polyimide and polyamide-imide, drying the polyalkylenetrimellitate imide polyalkylenetrimellitate ester imide coating, winding the wire to form a wound magnet, fabricating the wound magnet into an electrical component and bonding the polyalkylenetrimellitate imide polyalkylenetrimellitate ester imide varnish together to form a unitary electrical structure.
Claim 3
Dependent Claim
23 words
The process 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 4
Dependent Claim
18 words
The process of claim 2, wherein R 1 comprises ethylene and the A:B ratio is at least 1.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein R 2 comprises hexamethylene.
References Cited (Backward Citations)
US3697471A
Cited
US3944706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |