Patent US2367769A successfully refreshed from Google Patents.
Patent US4267231A successfully refreshed from Google Patents.
US4267231A
Expired / Lapsed
US
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Polyester imide wire enamels
Assignee: Von Roll Isola USA Inc
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Filing: 1979-06-29
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Granted: 1981-05-12
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Expires: 1999-06-29
Abstract
Abstract Superior wire enamels comprise polyester imides prepared in the presence of a monobutyl ether of a mixed diglycol having a free secondary hydroxyl group and dissolved in a solvent comprising predominantly a polar oxygenated compound selected from a monoether or monoester of an alkylene, or polyalkylene, glycol. Electrical conductors coated with such enamels are also disclosed.
Inventors
- 👤 Otto S. Zamek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:19
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; C09; C09D; C09D179/00; C09D179/04; C09D179/08; H01B3/308; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
An electrical wire enamel comprising (a) a polyester imide obtained by heating ingredients consisting essentially of (i) an aromatic diamine: (ii) an aromatic carboxylic anhydride containing at least one additional carboxylic group; (iii) terephthalic acid or a reactive derivative thereof; (iv) a polyhydric alcohol having at least three hydroxyl groups; (v) an alkylene glycol; and (vi) the secondary alcohol compound, 1-butoxyethoxy-2-propanol, until reaction therebetween is substantially complete; and (b) a solvent therefor comprising predominantly (i) an alkylene glycol monoether or monoester, (ii) a polyalkylene glycol monoether or monoester or (iii) a mixture of (i) and (ii).
Claim 2
Dependent Claim
96 words
An electrical wire enamel comprising (a) a polyester imide obtained by heating ingredients consisting essentially of (i) an aromatic diamine: (ii) an aromatic carboxylic anhydride containing at least one additional carboxylic group; (iii) terephthalic acid or a reactive derivative thereof; (iv) a polyhydric alcohol having at least three hydroxyl groups; (v) an alkylene glycol; and (vi) the secondary alcohol compound, 1-butoxyethoxy-2-propanol, until reaction therebetween is substantially complete; and (b) a solvent therefor comprising predominantly (i) an alkylene glycol monoether or monoester, (ii) a polyalkylene glycol monoether or monoester or (iii) a mixture of (i) and (ii).
Claim 3
Dependent Claim
15 words
An electrical wire enamel as defined in claim 1 which also includes an alkyl titanate.
Claim 4
Dependent Claim
54 words
An electrical wire enamel comprising (a) a polyester imide obtained by heating ingredients consisting essentially of: (i) methylene dianiline; (ii) trimellitic anhydride; (iii) terephthalic acid; (iv) tris(2-hydroxyethyl)isocyanurate; (v) ethylene glycol; and (vi) the secondary alcohol compound, 1-butoxyethoxy-2-propanol, until reaction therebetween is substantially complete; and (b) a solvent therefor comprising predominantly diethylene glycol monomethyl ether.
Claim 5
Dependent Claim
54 words
An electrical wire enamel comprising (a) a polyester imide obtained by heating ingredients consisting essentially of: (i) methylene dianiline; (ii) trimellitic anhydride; (iii) terephthalic acid; (iv) tris(2-hydroxyethyl)isocyanurate; (v) ethylene glycol; and (vi) the secondary alcohol compound, 1-butoxyethoxy-2-propanol, until reaction therebetween is substantially complete; and (b) a solvent therefor comprising predominantly diethylene glycol monomethyl ether.
Claim 6
Dependent Claim
14 words
An electrical wire enamel as defined in claim 3 which also includes tetraisopropyl titanate.
Claim 7
Dependent Claim
16 words
An electrical conductor provided with a continuous coating of the polyester-polyimide wire enamel of claim 1.
Claim 8
Dependent Claim
16 words
An electrical conductor provided with a continuous coating of the polyester-polyimide wire enamel of claim 3.
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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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |