US3584072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of epoxidizing water insoluble polyamides
Assignee: Hexion Inc
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Filing: 1969-07-22
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Granted: 1971-06-08
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Expires: 1989-07-22
Abstract
Abstract THIS INVENTION RELATES TO AN IMPROVED PROCESS FOR EPOXIDIZING WATER INSOLUBLE POLYAMIDES. THE PROCESS COMPRISES EPOXIDIZING IN THE PRESENCE OF ADDED WATER SOLUBLE ACID A POLYAMIDE FORMED BY REACTING A CARBOXYCLIC POLYCARBOXYLIC ACID WITH A POLYALKYLENE POLYAMINE, WHICH POLYAMIDE IS OF LIMITED WATER SOLUBILITY BELOW 10% CONCENTRATION BY WEIGHT IN WATER, AND WHICH DEVELOPS INSOLUBILITY CHARACTERISTICS AT CONCENTRATIONS OF 25%-70% BY WEIGHT OF REACTIVE COMPONENTS DURING EPOXIDATION IN A SUITABLE SOLVENT SYSTEM.
Inventors
- 👤 Alfred Edwards Winslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:17
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/48; Y; Y10; Y10S; Y10S24/00; Y10S24/08
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |