Benzene sulfonamide derivatives
CA 1282430 C · Owner: American Home Products Corporation · Inventors: Buzby, George C. Jr.; Colatsky, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention comprises a compound of the formula: in which R1 is alkylsulfonamido of 1 to 6 carbon atoms; R2 is alkyl of 2 to 6 carbon atoms; R3 is hydrogen or alkyl of 1 to 4 carbon atoms; R4 is alkyl of 1 to 4 carbon atoms; and n is one of the integers 2, 3 or 4; or a pharmaceutically acceptable salt thereof useful as antiarrhythmic agents as well as thee preparation and use.
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
- Granted April 2, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 2, 2008.
- 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.