Patent US3838154A successfully refreshed from Google Patents.
US3838154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2,6-diamino-3,5-dinitropyridines and derivatives thereof
Assignee: Horizons Inc
•
Filing: 1973-01-17
•
Granted: 1974-09-24
•
Expires: 1993-01-17
Abstract
Abstract PROCESS FOR THE PREPARATION OF 2,6-DIAMINO-3,5-DINITROPYRIDINE FROM 2,6DIAMINOPYRIDINE AND CATALYTIC REDUCTION OF THIS DINITROPYRIDINE TO 2,3,5,6-TETRAMINOPYRIDINE FREE BASE AND ACID SALTS THEREOF, AND PROCESSES FOR PREPARING POLYMERS FROM SAID PYRIDINES.
Inventors
- 👤 A Gerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:34
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/20; C08G73/0622; C08G73/0627; C08G73/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |