US3732331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of plastics and lacquer resins from basic nitrogen-containing glycidyl compounds and dicarboxylic anhydrides
Assignee: Wintershall Dea International AG
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Filing: 1970-08-10
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Granted: 1973-05-08
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Expires: 1990-08-10
Abstract
Abstract THIS INVENTION CONCERNS A PROCESS FOR INCREASING THE HARDENING RATES IN THE PREPARATION OF EPOXIDE RESINS USING DICARBOXYLIC ANHYDRIDES AS HARDENING AGENTS. THE INCREASE IN HARDENING RATES IS ACHIEVED BY REACTING MIXTURES OF BASIC NITROGEN-CONTAINING GLYCIDYL COMPOUNDS WITH DICARBOXYLIC ANHYDRIDES. AN OPTIONAL ASPECT OF THE INVENTIVE PROCESS IS TO CONDUCT THE ABOVE REACTION IN THE PESENCE OF ALKYD RESINS AND/OR SOLVENTS.
Inventors
- 👤 J Wollner
- 👤 M Cherubim
- 👤 F Henn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:50
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/28; C08G59/40; C08G59/42
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |