Thiazolidinone and oxazolidinone derivatives, their preparation and their use as vasodilators
CA 2064108 C · Owner: Mizuno, Hiroshi · Inventors: Ishihara, Sadao; Koike, Hiroyuki; Saito, Fujio
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: W represents a sulfur or oxygen atom and X represents a group of formula -N(R1)-, or W represents a group of formula -N(R1)- and X represents a sulfur or oxygen atom; R1 is hydrogen, alkyl or aralkyl; R2 and R3 are each hydrogen, alkyl, aralkyl aryl or, aromatic heterocyclic; R4 is hydrogen alkyl or, aralkyl; and A is alkylene which is optionally substituted by carboxy; and pharmaceutically acceptable salts and esters thereof, have a valuable vasodilatory 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 March 26, 1992 and granted September 26, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 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.