US3740410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid addition salts of 2,3,5,6-tetraaminopyridine and a process for their preparation
Assignee: Horizons Inc
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Filing: 1970-11-23
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Granted: 1973-06-19
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Expires: 1990-11-23
Abstract
Abstract PROCESSES FOR THE PREPARATION 2,6-DIAMINO-3,5-DINITROPYRIDINE FROM 2,6-DIAMINOPYRIDINE AND CATALYTIC REDUCTION OF THIS DINITROPYRIDINE TO 2,3,5,6-TETRAAMINOPYRIDINE 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 05:55
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/20; A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/49; A61K8/4906; A61K8/4926; A61Q; A61Q5/00; A61Q5/06; A61Q5/065; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/73; C08G73/0622; C08G73/0627; C08G73/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |