Patent US3721617A successfully refreshed from Google Patents.
US3721617A
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Photopolymerizable epoxy systems containing cyclic amide gelation inhibitors
Assignee: Primerica Inc
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Filing: 1971-05-18
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Granted: 1973-03-20
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Expires: 1991-05-18
Abstract
Abstract POLYMERIZATION OF EPOXIDE MONOMERS AND PREPOLYMERS, AND OF OTHER MATERIALS POLYMERIZABLE THROUGH THE ACTION OF CATIONIC CATALYSTS, IS CONTROLLED BY PROVIDING, IN ASSOCIATION WITH A RADIATION-SENSITIVE CATALYST PRECURSOR, A GELATION INHIBITOR IN THE FORM OF A CYCLIC AMIDE, SUCH AS AN N-SUBSTITUTED 2-PYRIDONE, OR A 2-PYRROLIDINONE MONOMER OR POLYMER SUBSTITUTED IN THE 1-POSITION.
Inventors
- 👤 W Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/44; Y; Y10; Y10S; Y10S522/00; Y10S522/901
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |