US3629198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxadiazoles
Assignee: Celanese Corp
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Filing: 1969-10-06
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Granted: 1971-12-21
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Expires: 1989-10-06
Abstract
Abstract POLYMERS REPRESENTED BY THE FORMULA: -(C-R-O-1,3,4-OXADIAZOL-2,5-YL-X)N- WHEREIN R IS ALKYLENE OR ARYLENE, N IS AN INTEGER, X IS AN OXADIAZOLYL RADICAL ATTACHED THROUGH A RING CARBON, OR A COVALENT BOND OR A RADICAL OF THE FORMULA: -R''-1,3,4-OXADIAZOL-2,5-YLENE- WHEREIN R'' IS ALKYLENE OR ARYLENE. POLYMERS OF THIS CLASS ARE CHARACTERIZED BY GOOD HIGH TEMPERATURE PROPERTIES AND THEY ARE THUS OF PARTICULAR UTILITY IN POLYMER APPLICATIONS WHERE HEAT STABILITY IS REQUIRED. THE INVENTION PROVIDES NEW PRECURSORS WHICH CAN BE CONVERTED TO THE AFOREDESCRIBED POLYMERS.
Inventors
- 👤 Henry W Steinmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:58
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/08
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |