US3218330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 3-hydroxypyridine
Assignee: Nepera Chemical Co Inc
•
Filing: 1963-06-13
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Granted: 1965-11-16
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Expires: 1983-06-13
Abstract
No abstract record available.
Inventors
- 👤 Bernard F Duesel
- 👤 Emmanuele Santo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:44
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/63; C07D213/65
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
AN IMPROVED METHOD FOR THE PREPARATION OF 3-HYDROXYPYRIDINE BY HYDROLYSIS OF 3-PYRIDINESULFONIC ACID WHICH COMPRISES REACTING 3-PYRIDINESULFONIC ACID-IN AN AQUEOUS SOLUTION WITH ALKALI METAL HYDROXIDES WHILE UNDER A PRESSURE GREATHER THAN 2 ATMOSPHERE.
Claim 2
Dependent Claim
33 words
AN IMPROVED METHOD FOR THE PREPARATION OF 3-HYDROXYPYRIDINE BY HYDROLYSIS OF 3-PYRIDINESULFONIC ACID WHICH COMPRISES REACTING 3-PYRIDINESULFONIC ACID-IN AN AQUEOUS SOLUTION WITH ALKALI METAL HYDROXIDES WHILE UNDER A PRESSURE GREATHER THAN 2 ATMOSPHERE.
References Cited (Backward Citations)
US1880645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |