Expired Canadian patentCanada
Retinoids
CA 2037150 C · Owner: Gross, Guenter · Inventors: Gross, Guenter
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Retinoids of the formula R1-OCH(R2)OC(O)R3 wherein R1 signifies 13-cis-retinoyl, R2 signifies hydrogen or lower-alkyl and R3 signifies straight-chain, lower-alkyl can be used as medicaments in the case of dermatological disorders.
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, 1991 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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 26, 1991
GrantedDecember 28, 1999
Term endedFebruary 26, 2011
Patent numberCA 2037150 C
Classification (IPC)C07C403/20 +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.