Process for producing simvastatin and/or its derivatives
CA 2321676 A1 · Owner: Lemmens, Jacobus Maria · Inventors: Peters, Theodorus H. A.; Lemmens, Jacobus Maria; Van Dalen, Frans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of a compound of formula (VI) comprising the , steps of: reacting a compound of general formula (I) with a ring-opening agent to provide a compound having general formula (II); protecting the hydroxy groups of the thus formed compound (II) with a pre-determined protective agent in order to substantially retard the reactivity thereof and provide a compound having general formula (III) or (VII), wherein the protective agent retards the reactivity of compound (II) by replacing the hydrogen atom of at least one of the hydroxy groups thereof with a carbon terminated group whereby, in the , case of compound (III) at least one of R3 and R4 is not hydrogen; …
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 March 5, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 5, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2021.
- 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.