A process for preparing 2-(methylthio)-5(trifluoromethyl)-1,3,4-thiadiazole using methyldithiocarbazinate and a molar excess of trifluoroacetic acid with recovery of trifluoroacetic acid
CA 2254609 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Prasad, Vidyanatha A.; Noack, Achim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for preparing 2-(methylthio)-5-(trifluoromethyl)-1,3,4-thiadiazole. The process includes the steps of reacting methyldithiocarbazinate with a molar excess of trifluoroacetic acid and recovering the excess trifluoroacetic acid.
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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
- Filed November 27, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2020.
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Timeline
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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.