Microbial process for preparation of optically active 3-hydroxypyrrolidine derivatives
CA 2338308 A1 · Owner: Wong, John Wing · Inventors: Wong, John Wing
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for the production of compounds of the, formulae:, from a compound of the formula comprising hydroxylating a compound of the formula I in the presence of an enzyme, produced by a microorganism of the genera Cunninghamella species or Aspergillus. Preferred microorganisms are Cunninghamella echinulata var. elegans and Aspergillus flavipes. Mixtures of compounds of formulae II and III may also be highly enriched in their, composition of compound II by using the enzyme from Cunninghamella echinulata ATC, 8688b.
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 February 26, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 26, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.