Patent US4038540A successfully refreshed from Google Patents.
Patent US3661859A successfully refreshed from Google Patents.
US3661859A
Expired / Lapsed
US
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Poly(1.3-imidazolidine-2,4,5-triones)
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1970-04-17
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Granted: 1972-05-09
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Expires: 1990-04-17
Abstract
Abstract NEW HETEROCYCLIC POLYMERS CONTAINING THE 1,3-IMIDAZOLIDINE-2,4,5-TRIONE-1,3-DIYL STRUCTURE ARE PRODUCED BY HYDROLYZING THE POLYMERS FORMED BY THE REACTION OF DIISOCYANATES WITH HYDROGEN CYANIDE, BY THE REACTION OF DICYANOFORMAMIDES WITH DIISOCYANATES AND BY THE POLYMERIZATION OF CYANOFORMAMIDYL ISOCYANATES. THE NEW HETEROCYCLIC POLYMERS ARE STABLE AND ARE USEFUL IN THE FORMATION OF FILMS, FIBERS, FOAMS, AND MOLDED OBJECTS.
Inventors
- 👤 Tad L Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:34
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3838; C08G18/83; C08G18/831; C08G18/832; C08G73/00; C08G73/06; C08G73/0605; C08G73/0616; Y; Y10; Y10S; Y10S528/00; Y10S528/903; Y10S528/906
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |