Patent US3793399A successfully refreshed from Google Patents.
US3793399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anionic polymerization of lactams in the presence of a polyether and a compound containing a urea,thiourea,or guanidine radical
Assignee: Loos J V D
•
Filing: 1971-09-21
•
Granted: 1974-02-19
•
Expires: 1991-09-21
Abstract
Abstract A PROCESS FOR THE PREPARATION OF POLYLACTAM POLYMERS OF IMPROVED NOTCH IMPACT STRENGTH IS DESCRIBED, THE PROCESS OF THE ANIONIC CATALYTIC POLYMERIZATION REACTION IN THE PRESENCE OF CERTAIN PROMOTERS BEING CARRIED OUT IN THE FURTHER PRESENCE OF A QUANTITY OF A POLYETHER WHICH IS SOLUBLE IN THE MOLTEN LACTAM BEING POLYMERIZED.
Inventors
- 👤 Der Loos J Van
- 👤 P Claassen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:08
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08L; C08L77/00; C08L77/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |