US3734893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of linear aromatic poly-1,3,4-oxadiazoles
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1971-10-19
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Granted: 1973-05-22
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Expires: 1991-10-19
Abstract
Abstract PROCESS FOR THE MANUFACTURE OF LINEAR AROMATIC POLY1,3,4-OXADIAZOLES BY REACTING IN CHLOROSULPHONIC ACID AN INORGANIC HYDRAZINE SALT AND AN AROMATIC DCARBOXYLIC ACID.
Inventors
- 👤 J Studinka
- 👤 R Gabler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:27
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |