US3560508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of 5,7-dichloro-8-hydroxy-quinoline and 5,7-dichloro-8-hydroxy-quinaldine
Assignee: Rutgerswerke und Teerverwertung AG
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Filing: 1968-02-20
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Granted: 1971-02-02
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Expires: 1988-02-20
Abstract
Abstract 5,7 - DICHLORO - 8 - HYDROXY-QUINOLINE OR 5,7-DICHLORO-8HYDROXY-QUINALDINE IS PRODUCED BY CHLORINATING A SOLUTION IN CHLOROFORM OF THE STARTING MATERIAL 8-HYDROXY-QUINOLINE OR 8-HYDROXY-QUINALDINE WITH AN EXCESS OF CHLORINE IN THE PRESENCE IN THE SOLUTION OF 0.5 TO 5% BY WEIGHT OF IODINE, BASED ON THE WEIGHT OF THE STARTING COMPOUND. AFTER CHLORINATION, THE SOLVENT IS REMOVED FROM THE REACTION MIXTURE BY DISTILLATION WITH THE ADDITIION OF WATER AND THE CHLORINATED PRODUCT IS PRECIPITATED AND FILTERED OFF. THE YIELD AMOUNTS E.G. TO ABOUT 94-97% OF THE THEORY.
Inventors
- 👤 Karl Ruhl
- 👤 Georg Grigoleit
- 👤 Ludwig Rappen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:27
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D215/24; C07D215/26; C07D215/28
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |