Patent US3635905A successfully refreshed from Google Patents.
US3635905A
Expired / Lapsed
US
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Cyanideion as catalyst for heterocyclic polymers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1970-05-22
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Granted: 1972-01-18
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Expires: 1990-05-22
Abstract
Abstract HETEROCYCLIC POLYMERS CONTAINING EITHER OR BOTH 4-IMINO1,3-IMIDAZOLIDINE - 2,5 - DIONE - 1,3 - DIYL RINGS AND/OR 5 - IMINO - 1,3 - IMIDAZOLIDINE -2,4 - DIONE - 1,3 - DIYL RINGS ARE PRODUCED IN THE PRESENCE OF AN ADDED CYANIDE ION BY THE REACTION OF DIISOCYANATES WITH HYDROGEN CYANIDE, BY THE REACTION OF DICYANOFORMAMIDES WITH DIISOCYANATES AND BY TEH POLYMERIZATION OF CYANOFORMAMIDYL ISOCYANATES. THE PRESENCE OF THE ADDED CYANIDE ION PRODUCES HETEROCYCLIC POLYMERS WITH SUBSTANTIALLY NO CROSSLINKING THROUGH THE IMINO GROUP OF THE IMIDAZODINE RINGS.
Inventors
- 👤 Tad L Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:26
CPC Classifications
C; C07; C07C; C07C255/00; C07C265/00; C08; C08G; C08G18/00; C08G18/02; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3838; C08G73/00; C08G73/06; C08G73/0605; C08G73/0616; Y; Y10; Y10S; Y10S528/00; 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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |