Patent DE2744444C3 successfully refreshed from Google Patents.
US3772253A
Expired / Lapsed
US
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Process for the anionic polymerization of lactams
Assignee: Bayer AG
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Filing: 1972-05-18
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Granted: 1973-11-13
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Expires: 1992-05-18
Abstract
Abstract AN IMPROVED PROCESS FOR THE PRODUCTION OF POLYAMIDES BY ACTIVATED ANIONIC POLYMERIZATION OF A POLYMERIZABLE MIXTURE COMPRISING A LACTAM, A CTALYST AND AN ACTIVATOR, WHEREIN AN ALUMINUM ALCOHOLATE IS ADDED TO SAID MIXUTRE.
Inventors
- 👤 B Brassat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:02
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |