Acylated enol derivatives of .alpha.-ketoesters and .alpha.-ketoamides
CA 2239159 C · Owner: Burkhart, Joseph P. · Inventors: Peet, Norton P.; Mehdi, Shujaath; Burkhart, Joseph P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to acylated enol derivatives of .alpha.-ketoesters and .alpha.-ketoamides. The compounds of this invention are either prodrugs of known elastase inhibitors or are elastase inhibitors in their own right and are useful in the treatment of various inflammatory diseases including cystic , fibrosis and emphysema.
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 November 4, 1996 and granted September 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2018.
- 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.