Process for the preparation of racemic pilosinine derivatives
CA 2053791 A1 · Owner: Heywang, Ulrich · Inventors: Casutt, Michael; Schwarz, Michael; Heywang, Ulrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of racemic pilosinine derivatives as precursor for the alkaloid pilocarpine of pharmacological importance from a 5-formyl-1imidazole of the formula I, in which, R1 is a low molecular weight straight-chain or branched alkyl chain with 1-6 C atoms which, via the stage of the thioacetal, is added onto .gamma.-crotonolactone. pat180791ei2
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 October 21, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 21, 2013.
- 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.