US3681294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of 2-pyrrolidone in the presence of so2 with mixture of an alkali metal sulfite and an alkali metal bisulfite
Assignee: Radiation Research Corp
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Filing: 1970-09-03
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Granted: 1972-08-01
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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 SULFUR DIOXIDE AS A POLYMERIZATION ACTIVATOR, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE POLYMERIZATION IN THE PRESENCE OF A MIXTURE OF AN ALKALI METAL SULFITE AND AN ALKALI METAL BISULFITE WHICH HAS BEEN ADDED TO THE REACTION MASS BEFORE THE POLYMERIZATION, THE SULFUR DIOXIDE BEING NOT MORE THAN 0.90 MOL PER MOL OF ALKALINE POLYMERIZATION CATALYST.
Inventors
- 👤 Peter A Jarovitzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:19
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |