Arylsulfonylimidazolone derivatives as an antitumor agent
CA 2263353 C · Owner: Lee, Dug Keun · Inventors: Hwang, Hyun Sook; Yun, Hae Ran; Choi, Dong Rack
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a novel arylsulfonylimidazolone derivative represented by formula (I) which shows a superior antineoplastic activity in contrast to the known sulfonylurea antitumor agents as well as little side effect; and its pharmaceutically acceptable salt and stereoisomer in which , <u>--</u>, R1 and R2 are as defined in the specification.
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 August 20, 1997 and granted April 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2019.
- 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.