US3682869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of 2-pyrrolidone with carbon dioxide as activator
Assignee: Radiation Research Corp
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Filing: 1970-09-03
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Granted: 1972-08-08
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Expires: 1990-09-03
Abstract
Abstract IN THE POLYMERIZATION OF 2-PYRROLIDONE IN THE PRESENCE OF AN ALKALINE POLYMERIZATION CATALYST AND CARBON DIOXIDE, THE IMPROVEMENT WHICH COMPRISES ADDING SAID CARBON DIOXIDE TO A CONCENTRATED REACTION MASS HAVING A MOLAR RATIO OF FROM ABOUT 1 TO ABOUT 4 MOLS OF 2-PYRROLIDONE PER MOL OF ALKALINE POLYMERIZATION CATALYST AND THEN DILUTING SAID CONCENTRATED, CARBONATED REACTION MASS WITH AN AMOUNT OF 2-PYRROLIDONE SUFFICIENT TO PROVIDE AT LEAST 9 MOLS OF TOTAL 2-PYRROLIDONE PER MOL OF ALKALINE POLYMERIZATION CATALYST BEFORE SAID CARBONATED REACTION MASS IS POLYMERIZED.
Inventors
- 👤 Peter A Jarovitzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:41
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |