US3778402A
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Polymerization of 2-pyrrolidone using a catalyst formed by reaction between 2-pyrrolidone and aqueous koh
Assignee: EDPAC Corp 200 WELSH ROAD HORSHA PA A DE CORP
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Filing: 1971-12-27
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Granted: 1973-12-11
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Expires: 1991-12-27
Abstract
Abstract 2-PYRROLIDONE IS POLYMERIZED USING POTASSIUM PYRROLIODONATED HAVING BEEN PREPARED BY REACTION BETWEEN 2PYRROLIDONE AND AN AQUEOUS SOLUTION OF KOH.
Inventors
- 👤 K Watanabe
- 👤 T Yoshimura
- 👤 K Kohyama
- 👤 T Kimura
- 👤 Y Ohmura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:38
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
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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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |