Benzenesulfonamide derivatives and drugs containing the same
CA 2271673 A1 · Owner: Yasuda, Shingo · Inventors: Sakurai, Shunichiro; Yasuda, Shingo; Ogawa, Nobuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel benzenesulfonamide derivatives of general formula (I); (wherein R1 is hydrogen, halogeno, lower alkyl, lower alkoxy or nitro; R2 is C4-C8 alkyl substituted with one or more fluorine atoms; R3 is hydrogen or lower alkyl; X is sulfur or CH=CH; and n is an integer of 2 to 4). Drugs containing the derivatives as the active ingredient are usable for the invention and/or treatment of thrombosis, asthma or allergic 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 12, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 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.