Novel substituted salicylic acids
CA 2123697 C · Owner: Kabi Pharmacia Ab · Inventors: Smedegard, Goran; Olsson, Lars-Inge; Agback, Karl Hubert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of the formula Het-NR-SO2-Ph2-A-Ph1 (COOH)(OH) and tautomic form salts, solvates, C1-6 alkyl esters, and pharmaceutical compositions of the compound. Ph1 and Ph2 are benzene rings with the proviso that carboxy and hy-, droxy are ortho to one another. Het includes an optionally substituted heterocyclic ring which includes conjugated double bonds and binds to nitrogen in NR. The compound is characterized in that A is a bridge which is stable against reduction because it is not azo, and in that R is hydrogen or lower alkyl. The invention also includes the preparation of the compound and its use as a drug, particularly for treating autoimmune diseases.
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, 1992 and granted December 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2014.
- 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.