US3585171A
Expired / Lapsed
US
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Accelerating the anionic polymerization of lactams
Assignee: BASF SE
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Filing: 1968-06-27
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Granted: 1971-06-15
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Expires: 1988-06-27
Abstract
Abstract A PROCESS FOR ACCELERATING POLYMERIZATION OF LACTAMS CARRIED OUT IN THE PRESENCE OF ALKALINE CATALYSTS AT TEMPERATURES OF FROM 80* TO 200*C. USING LACTAM-N-CARBOXYLIC ACID CARBAZOLAMIDES AS ACTIVATORS.
Inventors
- 👤 Adolf Steinhofer
- 👤 Manfred Patsch
- 👤 Helmut Doerfel
- 👤 Georg Falkenstein
- 👤 Wolfgang-Dieter Jesterich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:07
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |