Novel sulfonamide derivatives
CA 2289517 A1 · Owner: Nippon Kayaku Kabushiki Kaisha · Inventors: Morohashi, Hirohisa; Sato, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sulfonamide derivatives represented by general formula (1) or pharmaceutically acceptable salts thereof, which have little toxicity and a potent effect of inhibiting tubulin polymerization wherein R1 preferably represents lower alkoxy; R2, R3, R4, R5 and R6 may be the same or different and each independently represents hydrogen, halogeno nitro, lower alkyl, optionally , substituted amino or alkylamino; A represents: (1) a 5-membered heterocyclic group having at least one nitrogen atom which may be substituted and contain as the heteroatom an atom selected from among nitrogen oxygen and sulfur, provided that triazole is excluded therefrom; (2) an optionally substituted alicyclic …
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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 May 29, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 2020.
- 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.