US3759880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrrolidone-2 manufacture of insoluble and only slightly swellable poly - n - vinyl
Assignee: BASF SE
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Filing: 1971-11-30
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Granted: 1973-09-18
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Expires: 1991-11-30
Abstract
Abstract MANUFACTURE OF POLY-N-VINYLPRROLIDONE-2 BY POLYMERIZATION OF VINYL PYRROLIDONE IN THE PRESENCE OF UNSATURATED CYCLIC ACID AMIDES AND AN OXIDIZABLE METAL.
Inventors
- 👤 E Hoffmann
- 👤 K Herrle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
C; C08; C08L; C08L39/00; C08L39/04; C08L39/06; C08F; C08F2/00; C08F2/04; A; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/817; A61K8/8182; C08F126/00; C08F126/06; C08F126/10; C08F2/10; C08F226/00; C08F226/06; C08F226/10; C08F26/00; C08F26/06; C08F4/00; C08F4/42; C12; C12H; C12H1/00; C12H1/02; C12H1/04
Claims Analysis
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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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |