US3575986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing pyridine
Assignee: Braskem America Inc
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Filing: 1968-06-06
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Granted: 1971-04-20
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Expires: 1988-06-06
Abstract
Abstract A METHOD IS DISCLOSED FOR PRODUCING PYRIDINE AND RELATED COMPOUNDS IN WHICH FORMANIDE IS USED AS THE NITROGEN-BEARING STARTING MATERIAL. FORMAMIDE IS REACTED WITH AN UNSATURATED HYDROCARBON (E.G. ACETYLENE) IN THE PRESENCE OF A CATALYST (E.G. ALUMINA SPHERES COATED WITH ZINC FLUORIDE).
Inventors
- 👤 Joseph G Crist
- 👤 John O Hawthorne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:13
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/08
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |