US3560518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic-poly(nitrile carbonates)
Assignee: Sinclair Research Inc
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Filing: 1968-03-18
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Granted: 1971-02-02
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Expires: 1988-03-18
Abstract
Abstract THERE ARE DISCLOSED COMPOUNDS OF THE FORMULA: (2-(O=)-1,3,4-DIOXAZOL-5-YL)(N+1)-A WHEREIN N IS AN INTEGER OF 1 TO 3 AND A IS AROMATIC HYDROCARBON OF UP TO ABOUT 30 CARBON ATOMS AND OF 2 TO 3 MONOCYCLIC AROMATIC RINGS OR ONE FUSED BICYCLIC AROMATIC RING OR ONE FUSED TRICYCLIC AROMATIC RING. THE COMPOUNDS CAN BE MADE BY REACTING THE CORRESPONDING HYDROXAMIC ACIDS AND PHOSGENE. THE COMPOUNDS ARE USEFUL AS, INTER ALIA, AROMATIC POLYISOCYANATE GENERATORS AND HAVE THE ADVANTAGE OVER CONVENTIONAL AROMATIC POLYISOCYANATES IN THAT THEY CAN BE EASILY HANDLED AND STORED.
Inventors
- 👤 Emmett H Burk Jr
- 👤 Donald D Carlos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:30
CPC Classifications
C; C07; C07D; C07D273/00
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |