Expired Canadian patentCanada
Process for the desilylation of a 4-silyloxy-tetrahydro-pyran-2-one
CA 2036962 C · Owner: Kawaguchi, Alan T. · Inventors: Decamp, Ann E.; Volante, Ralph P.; Kawaguchi, Alan T.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described for the removal of a silyl protecting group from the 4-hydroxy group of a tetrahydro-pyran-2-one moiety.
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 25, 1991 and granted September 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 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.
FiledFebruary 25, 1991
GrantedSeptember 15, 1998
Term endedFebruary 25, 2011
Patent numberCA 2036962 C
Classification (IPC)C07D309/28 +2 more
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.