US3565866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous polymerization of lactams
Assignee: BASF SE
•
Filing: 1968-11-05
•
Granted: 1971-02-23
•
Expires: 1988-11-05
Abstract
Abstract AN IMPROVED PROCESS FOR THE CONTINUOUS POLYMERIZATION OF LACTAMS HAVING 5 TO 13 RING MEMBERS IN A POLYMERIZATION TUBE IN WHICH PROCESS THE LACTAMS ARE PREPOLYMERIZED IN THE FIRST ZONE OF A MODIFIED POLYMERIZATION TUBE WITH VIGOROUS STIRRING UP TO A CONVERSION OF MORE THAN 50%, FURTHER POLYMERIZED IN THE SECOND AND THIRD ZONES AT NEARLY LAMINAR FLOW AND AFTER-POLYMERIZED IN THE FOURTH ZONE AT A TEMPERATURE SLIGHTLY ABOVE THE MELTING POINT OF THE RESULTANT POLYMER.
Inventors
- 👤 Ernst Guenther
- 👤 Hermann Linge
- 👤 Kurt Noe
- 👤 Hans Pirzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:04
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; B; B01; B01J; B01J19/00; B01J19/0006; B01J19/0013; B01J19/18; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00078; B01J2219/00083; B01J2219/00087; B01J2219/00094; B01J2219/18; B01J2219/185
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |