Stereoselective microbial or enzymatic reduction of 3,5-dioxo esters to 3-hydroxy-5-oxo, 3-oxo-5-hydroxy, and 3,5-dihydroxy esters
CA 2094191 C · Owner: Mcnamee, Clyde G. · Inventors: Mcnamee, Clyde G.; Szarka, Laszlo J.; Banerjee, Amit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Microorganisms or reductases derived therefrom reduce a diketo ester, (see formula I), to form the associated 3-hydroxy 5-hydroxy, or 3,5-dihydroxy, esters. Selected microorganisms produce the preferred stereoisomers, (see formula II, III, IV) which can be used to prepare antihypercholesterolemic agents such as, (see formula V)
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 16, 1993 and granted September 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 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.