US3394112A
Expired / Lapsed
US
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Anionic polymerization of anhydrous lactams with amido acetals as co-catalysts
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1965-10-19
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Granted: 1968-07-23
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Expires: 1985-10-19
Abstract
No abstract record available.
Inventors
- 👤 Stoll Bernhard
- 👤 Griehl Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:17
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
41 words
IN THE POLYMERIZATION OF ANHYDROUS LACTAMS HAVING MORE THAN 6 RING MEMBERS UNDER EXCLUSION OF OXYGEN AND MOISTURE AND IN THE PRESENCE OF A CATALYST AND A COCATALYST, THE IMPROVEMENT WHICH COMPRISES USING AS SAID CO-CATALYST A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
41 words
IN THE POLYMERIZATION OF ANHYDROUS LACTAMS HAVING MORE THAN 6 RING MEMBERS UNDER EXCLUSION OF OXYGEN AND MOISTURE AND IN THE PRESENCE OF A CATALYST AND A COCATALYST, THE IMPROVEMENT WHICH COMPRISES USING AS SAID CO-CATALYST A COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
US3138576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |