Ethers of 1-benzyl-3-hydroxymethyl-indazole with aliphatic 2-hydroxyacids
CA 2009503 C · Owner: Silvestrini, Bruno · Inventors: Silvestrini, Bruno; Baiocchi, Leandro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds and methods of preparation of compounds with the formula A-CH2-O-CRR'-COOR"' (I), where A is a 1-benzyl-indazol-3-yl nucleus of the formula (see formula II), R and R' may be the same or different and are H or C1-C5 alkyl R"' is H or , the residue of, an aliphatic saturated alcohol having from 1 to 4 carbon atoms; and when R"' , is H, the, salts thereof with pharmaceutically acceptable bases. The addition of a methylene group, (-CH2-) between the 1-benzyl-indazol-3yl nucleus and the side claim (-O-CH2- COOR"'), endows the compounds of Formula (I) with analgesic activity.
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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 7, 1990 and granted April 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 2012.
- 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.