US3138576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the anionic polymerization of caprolactam with benzimido compounds as actvators
Assignee: EIDP Inc
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Filing: 1961-09-15
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Granted: 1964-06-23
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Expires: 1981-09-15
Abstract
No abstract record available.
Inventors
- 👤 Anderson Burton Carl
- 👤 Kohan Melvin Ira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:14
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
43 words
A PROCESS FOR THE RAPID POLYMERIZATION OF A SUBSTANTIALLY ANHYDROUS W-LACTAM TO A SOLID POLYAMIDE WHICH COMPRISES MIXING THE LACTAM WITH AN ANIONIC CATALYST CONSISTING OF AN IMINIUM SALT OF AN W-LACTAM AND A CO-CATALYST CONSISTING OF A BENZIMIDO COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
43 words
A PROCESS FOR THE RAPID POLYMERIZATION OF A SUBSTANTIALLY ANHYDROUS W-LACTAM TO A SOLID POLYAMIDE WHICH COMPRISES MIXING THE LACTAM WITH AN ANIONIC CATALYST CONSISTING OF AN IMINIUM SALT OF AN W-LACTAM AND A CO-CATALYST CONSISTING OF A BENZIMIDO COMPOUND 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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |