US3697484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyamide-imide esters based on isocyanates,acid anhydrides and lactones
Assignee: Bayer AG
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Filing: 1970-12-11
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Granted: 1972-10-10
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Expires: 1990-12-11
Abstract
Abstract THE INVENTION RELATES TO A PROCESS FOR THE PREPARATION OF POLYAMIDE-IMIDE ESTERS BY REACTING TOGETHER A LACTONE, AN ACID ANHYDRIDE, A CARBOXYLIC ACID AND AN ISOCYANATE. THIS PROCESS ENABLES POLYAMIDE-IMIDE ESTERS TO BE PRODUCED WHICH ARE DISTINGUISHED BY THEIR PARTICULARLY HIGH TEMPERATURE RESISTANCE AND WHICH ARE SUITABLE FOR USE AS LACQUERS, FOILS AND COMPACT OR FOAMED MOULDINGS. THEIR PROPERTIES CAN BE VARIED FOR PARTICULAR PURPOSES BY THE ADDITION OF FILLERS, PIGMENTS AND LOW MOLECULAR WEIGHT AND HIGH MOLECULAR WEIGHT COMPONENTS.
Inventors
- 👤 Wilfried Zecher
- 👤 Rudolf Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G18/348; C08G18/343; C08G18/40; C08G18/42; C08G18/4266; C08G18/4269; C08G73/00; C08G73/06; C08G73/10; C08G73/16; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/302; H01B3/303; H01B3/306
Claims Analysis
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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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |