Patent US3236789A successfully refreshed from Google Patents.
US3236789A
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Process for making foamed polycaprolactam
Assignee: EIDP Inc
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Filing: 1962-02-06
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Granted: 1966-02-22
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Expires: 1982-02-06
Abstract
No abstract record available.
Inventors
- 👤 Fuller Mack Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:47
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08J9/106; C08J2377/00; C08J2377/02; Y; Y10; Y10S; Y10S264/00; Y10S264/14; Y10S264/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN A PROCESS FOR MAKING FOAMED POLYCAPROLACTAM BY THE POLYMERIZATION OF E-CAPROLACTAM IN THE PRESENCE OF AN ANIONIC CATALYST PREPARED FROM THE REACTION OF A LACTAM WITH A BASE SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL BASES AND A COCATALYST CAPABLE OF PROMOTING POLYMERIZATION OF E-CAPROLACTAM AT A TEMPERATURE BELOW THE MELTING POINT OF THE RESULTING POLYMER, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE POLYMERIZATION REACTION IN THE PRESENCE OF AN ALLYLIC AZIDE FOAMING AGENT HAVING THE STRUCTURE
Claim 2
Dependent Claim
81 words
IN A PROCESS FOR MAKING FOAMED POLYCAPROLACTAM BY THE POLYMERIZATION OF E-CAPROLACTAM IN THE PRESENCE OF AN ANIONIC CATALYST PREPARED FROM THE REACTION OF A LACTAM WITH A BASE SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL BASES AND A COCATALYST CAPABLE OF PROMOTING POLYMERIZATION OF E-CAPROLACTAM AT A TEMPERATURE BELOW THE MELTING POINT OF THE RESULTING POLYMER, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE POLYMERIZATION REACTION IN THE PRESENCE OF AN ALLYLIC AZIDE FOAMING AGENT HAVING THE STRUCTURE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |