Process for the preparation of substituted indanones, and their use
CA 2094980 A1 · Owner: Weisse, Laurent · Inventors: Weisse, Laurent; Kuber, Frank; Strutz, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure Process for the preparation of substituted indanones and, their use, 1- Indanones of the formula IV or IVa (IV) (IVa), in which R1 to R7 are preferably hydrogen or alkyl or, adjacent radicals R1 to R4 form a ring are obtained in a, one-step reaction by reacting a compound I (I), with a compound of the formula II or a compound III (II), ( I I I ), in liquid hydrogen fluoride.
Read the whole patent
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 April 27, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2015.
- 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.