1,3,4-oxadiazole derivatives and process for the preparation thereof
CA 2401240 A1 · Owner: Sugiura, Tsuneyuki · Inventors: Horiuchi, Toshihide; Miyazaki, Toru; Sugiura, Tsuneyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing 1,3,4-oxadiazole derivatives represented by the general formulae (I) and (IV) (wherein the symbols have the same meanings as in the description); and the novel 1,3,4-oxadiazole derivative compound represented by the general formula (I). By the process a compound represented , by the general formula (IV) which is an intermediate for a 1,3,4-oxadiazole derivative useful as a medicine (elastase inhibitor) can be efficiently , produced via a novel intermediate (the compound represented by the general formula (I)).
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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 February 2, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 2, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 2023.
- 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.