US3304291A
Expired / Lapsed
US
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Anionic polymerization of lactams with lactam-nu-carbamido compounds as activators
Assignee: BASF SE
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Filing: 1965-03-22
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Granted: 1967-02-14
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Expires: 1985-03-22
Abstract
No abstract record available.
Inventors
- 👤 Dachs Karl
- 👤 Boeck Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:04
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN A PROCESS FOR POLYMERIZING LACTAMS HAVING ONE -CONH- GROUP IN THE LACTAM RING AND HAVING AT LEAST 6 RING CARBON ATOMS IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF A ALKALI METAL LACTAMS AND ALKALINE EARTH METAL LACTAMS, THE IMPROVEMENT WHICH COMPRISES POLYMERIZING SAID LACTAMS AT TEMPERATURES ABOVE 100%C. IN THE PRESENCE OF 0.1 TO 15% BY WEIGHT, BASED ON SAID LACTAM, OF A POLYMERIZATION ACTIVATOR OF THE FORMULA
Claim 2
Dependent Claim
74 words
IN A PROCESS FOR POLYMERIZING LACTAMS HAVING ONE -CONH- GROUP IN THE LACTAM RING AND HAVING AT LEAST 6 RING CARBON ATOMS IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF A ALKALI METAL LACTAMS AND ALKALINE EARTH METAL LACTAMS, THE IMPROVEMENT WHICH COMPRISES POLYMERIZING SAID LACTAMS AT TEMPERATURES ABOVE 100%C. IN THE PRESENCE OF 0.1 TO 15% BY WEIGHT, BASED ON SAID LACTAM, OF A POLYMERIZATION ACTIVATOR OF THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |