Patent US3793250A successfully refreshed from Google Patents.
US3793250A
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US
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Process of making a modified polyester imide wire insulation and product obtained thereby
Assignee: Beck & Co AG
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Filing: 1971-12-17
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Granted: 1974-02-19
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Expires: 1991-12-17
Abstract
Abstract A POLYESTER IMIDE LACQUER IS FORMED BY REACTING A POLYCARBOXYLIC ACID, A POLYBASIC ALCOHOL, A POLY-FUNCTIONAL AMINO COMPOUND OR DERIVATIVE OF THESE COMPOUNDS IN THE PRESENCE OF A SOLVENT AND A CONDENSATION CATALYST, AT LEAST ONE OF THE STARTING MATERIALS INCLUDING AT LEAST ONE FIVEMEMBER LACTAM RING AND AT LAST ONE OTHER OF THE STARTING MATERIALS INCLUDING AT LEAST ONE FIVE-MEMBER IMIDE RING. THE LACQUER THUS FORMED RETAINS THE HIGH HEAT RESISTANCE OF PURE ESTER IMIDE RESINS BUT HAS IMPROVED LACQUER PROPERTIES AND INCREASED SURFACE HARDNESS AND BETTER APPLICATION PROPERTIES FOR FORMING A WIRE COATING.
Inventors
- 👤 K Schmidt
- 👤 G Boockmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:27
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/16; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |