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US3721652A
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Polymers of 2-pyrrolidone
Assignee: Radiation Research Corp
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Filing: 1970-09-03
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Granted: 1973-03-20
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Expires: 1990-09-03
Abstract
Abstract 2-PYRROLIDONE IS POLYMERIZED TO A NEW WHITE, HIGH MOLECULAR WEIGHT POLYMER BEING PARTICULARLY SUITABLE FOR MELT EXTRUSION INTO FIBERS, FILMS AND OTHER SHAPED ARTICLES, A CONTINUOUS PROCESS OF POLYMERIZATION IS DESCRIBED.
Inventors
- 👤 C Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:56
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24; D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |