Process for preparing 3-methoxy-4-(4'-aminobenzene- sulfonamido)-1,2,5-thiadiazole
CA 1088548 A · Owner: Chemie Linz Aktiengesellschaft · Inventors: Franzmair, Rudolf; Menzl, Kurt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-Methoxy-4-(4'-aminobenzenesulphonamido)-1,2,5-thiadiazole is prepared by reaction of 3-methoxy-4-chloro- -1,2,5-thiadiazole with sulfanilamide in dimethylsulfoxide as solvent and in the presence of alkalihydroxides or carbonates using a reaction temperature of from ambient temperature to 95°C, whereby per mole of thiadiazole-compound from 1.2 to 1.5 mole of sulfanilamide and from 1.5 to 3 moles of the alkali hydroxide or carbonate are used, whereafter the reaction product is obtained by acidification.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted October 28, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 28, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.