US3798228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of difluoropyridines
Assignee: Olin Corp
•
Filing: 1970-04-13
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Granted: 1974-03-19
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Expires: 1990-04-13
Abstract
Abstract THIS INVENTION RELATES TO THE PREPARATION OF DIFLUOROPYRIDINES AND SUBSTITUTED DIFLUOROPYRIDINES BY THE SIMULTANEOUS REPLACEMENT OF TWO AMONO GROUPS BY DIAZOTIZATION OF SELECTED DIAMINOPYRIDINES IN HYDROGEN FLUORIDE.
Inventors
- 👤 M Boudakian
- 👤 S Chiras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:43
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/61
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |