Process for preparing piperonal
CA 1097666 A · Owner: Mitsui Toatsu Chemicals, Inc. · Inventors: Nakatani, Kiyoshi; Numata, Satoshi; Inoue, Tsuneo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title of the Invention, Process for Preparing Piperonal Abstract of the Disclosure, A process for preparing piperonal which comprises the steps of reacting 1, 2-methylenedioxybenzene with an N-alkylformanilide and a condensing agent comprising one or more compounds selected from the group consisting of phosgene, phosphorus oxychloride phosphorus oxybromide, thionyl chloride thionyl bromide, sulfuryl chloride, sulfuryl bromide phosphorus trichloride, and, phosphorus pentachloride and then hydrolyzing the resulting, reaction product. -1-
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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 March 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 1998.
- 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.