Patent US3632807A successfully refreshed from Google Patents.
US3632807A
Expired / Lapsed
US
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Process for the preparation of 2-chloro-pyridine and its derivatives
Assignee: Rain Carbon Germany GmbH
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Filing: 1968-11-08
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Granted: 1972-01-04
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Expires: 1988-11-08
Abstract
Abstract COMPOUNDS CORRESPONDING TO THE FORMULA 2-(CL-),R1,R2-PYRIDINE WHEREIN R1 AS WELL AS R2 ARE SELECTED FROM THE GROUP CONSISTING OF H, ALKYL RADICALS HAVING 1-4 CARBON ATOMS AND HALOGEN, ARE PREPARED BY REACTING 2-AMINO-PYRIDINES CORRESPONDING TO THE FORMULA 2-(H2N-),R1,R2-PYRIDINE WHEREIN R1 AND R2 HAVE THE SAME MEANING AS ABOVE, IN METHANOLIC SOLUTION SATURATED WITH HYDROGEN CHLORIDE, WITH ALKYL NITRITE, IN THE TEMPERATURE RANGE OF 0 TO 50*C.
Inventors
- 👤 Manfred Maurer
- 👤 Uber Frankenthal
- 👤 Winfried Orth
- 👤 Ludwig Rappen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:51
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/61; C07D401/00; C07D401/02; C07D401/04; C07D401/12; C07D471/00; C07D471/02; C07D471/04
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |