Benzenesulfonamides and a process for their preparation
CA 2010272 C · Owner: Granzer, Ernold · Inventors: Granzer, Ernold; Kerekjarto, Bela; Lang, Hans-Jochen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula I, (see formula I) where, R1 is methyl, isopropyl or tert.-butyl R2 is isopropyl or tert.-butyl, R3 is hydrogen chlorine, or straight-chain or branched alkoxy having 1 to 3 carbon atoms, R4 is trifluoromethyl or a radical -SO n-A in which n=0, 1 or 2, and A is , alkyl having 1 - 3 carbon atoms or, if n=2, A is NR6R7 with R6 and R7 being hydrogen or alkyl having 1 - 4 carbon atoms and, R5 is hydrogen or alkyl having 1-3 carbon atoms. A process for their preparation and their use as medicaments are described. They are effective lipid-lowering agents with antioxidative properties from the benzenesulfonamide series. They do not have hypotensive and diuretic properties.
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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 February 16, 1990 and granted November 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2012.
- 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.