US3748329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compounds containing the 2,4,6-triketo-1,3,5-oxadiazine ring
Assignee: Bayer AG
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Filing: 1970-07-08
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Granted: 1973-07-24
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Expires: 1990-07-08
Abstract
Abstract COMPPUNDS CONTAINING THE 2,4,6 - TRIKETO-1,3,5-OXIDAAZINE RING WHICH MAY BE PREPARED BY REACTING AN ORGANIC DIISOCYANATE WITH CARBON DIOXIDE IN THE PRESENCE OF CERTAIN CATSLYSTS INCLUDING PHOSPHINE OR ARSINE CATALYSTS ARE DISCLOSED AS WELL AS POROUS AND NON-POROUS POLMERS BASED ON THE COMPOUNDS CONTAINING THE 2,4,6-TRIKETO-1,3,5-OXADIAZINE RING. THE COMPOUNDS ARE PREPARED BY SATURATING AN ORGANIC POLYISOCYANATE WHERE THE ISOCYANATE GROUPS HAVE APPROXIMATELY EQUAL REACTIVITY WITH CARBON DIOXIDE AND THE CATALYZING THE REACTION OF THE ISOCYANATE WITH THE CARBON DIOXIDE TO YEILD THE 2,4,6-TRIKETO-1,3,5-OXADIAZINE DERIVATIVE.
Inventors
- 👤 D Liebsch
- 👤 E Meisert
- 👤 G Stopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:56
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7875; C08G18/7887
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |