New pharmacologically active catechol derivatives
CA 2080917 C · Owner: Honkanen, Erkki · Inventors: Baeckstroem, Reijo; Pippuri, Aino; Nissinen, Erkki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I), wherein R1 is an electronegative substituent such as nitro, halogeno or cyano group and R2, is a group selected from (Ia) and (Ib) wherein R is hydrogen, or an alkyl, cycloalkyl aralkyl or aryl group, wherein X1, X2, Y and Z are independently oxygen sulfur of NR, wherein R may be as defined above and pharmaceutically acceptable esters and salts thereof are useful in the prevention or treatment of tissue damage induced by lipid peroxidation.
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 26, 1991 and granted June 12, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 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.
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.