US2512249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alkali metal derivatives of 2-aminopyridine
Assignee: Wyeth Holdings LLC
•
Filing: 1948-04-17
•
Granted: 1950-06-20
•
Expires: 1968-04-17
Abstract
No abstract record available.
Inventors
- 👤 Martin E Hultquist
- 👤 John C Paterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:05
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/74
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
60 words
A METHOD OF PRODUCING A DERIVATIVE OF 2AMINOPYRIDINE CAPABLE OF REACTING WITH A DIALKYLAMINOALKYL CHLORIDE IN AN INERT ORGANIC SOLVENT THEREFOR TO YIELD A D-(DIALKYLAMINOALKYLAMINO) PYRIDINE, WHICH COMPRISES FORMING AN ANHYDROUS MIXTURE OF 2-AMINOPYRIDINE, AN ALKALI METAL ALCOHOLATE, AND AN INERT ORGANIC SOLVENT THEREFOR, HEATING SAID MIXTURE, REACTING SAID ALCOHOLATE WITH SAID PYRIDINE, AND DISTILLING OFF THE ALCOHOL WHICH FORMS.
References Cited (Backward Citations)
US2230774A
Cited
US2406594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |