Patent US3274132A successfully refreshed from Google Patents.
US3274132A
Expired / Lapsed
US
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Process of polymerizing and foaming caprolactam
Assignee: EIDP Inc
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Filing: 1963-04-22
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Granted: 1966-09-20
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Expires: 1983-04-22
Abstract
No abstract record available.
Inventors
- 👤 John W Giberson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:38
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20; C08J2377/00; C08J2377/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR THE POLYMERIZATION OF E-CAPROLACTAM TO POLY-E-CAPROLACTAM WHICH COMPRISES HEATING SAID LACTAM IN THE PRESENCE OF A LACTAM BASE SALT PREPARED BY THE REACTION O A BASE WITH A LACTAM AND A COCATALYST HAVING THE FORMULA
Claim 2
Dependent Claim
38 words
A PROCESS FOR THE POLYMERIZATION OF E-CAPROLACTAM TO POLY-E-CAPROLACTAM WHICH COMPRISES HEATING SAID LACTAM IN THE PRESENCE OF A LACTAM BASE SALT PREPARED BY THE REACTION O A BASE WITH A LACTAM AND A COCATALYST HAVING THE FORMULA
References Cited (Backward Citations)
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US3052642A
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US3017391A
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FR1229130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |