Sulfonamide endothelin antagonists
CA 2089184 A1 · Owner: Hunt, John T. · Inventors: Stein, Philip D.; Hunt, John T.; Murugesan, Natesan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
HA605a, Abstract, SULFONAMIDE ENDOTHELIN ANTAGONISTS Compounds of the formula, inhibit endothelin wherein:, one of X and Y is N and the other is O; R is naphthyl or naphthyl substituted with R1, R2 and R3; R1, R2 and R3 are each independently hydrogen; alkyl alkenyl, alkynyl, alkoxy, cycloalkyl, cycloalkylalkyl cycloalkenyl, cycloalkanylalkyl, aryi, or aralkyl any of which may be substituted, with Z1 Z2 and Z3; halo; hydroxyl; cyano; nitro; -C(O)H; -C(O)R6; -C02H; -C02R6; -SH; -S(O)nR6; -S(O)m-OH; -S(O)m-OR6; -O- S(O)m-R6;-O-S(O)mOH; -O-S(O)m-OR6; -Z4-NR7R8; or-Z4-N(R11)- Z5-NR9R10;, R4 and R5 are each independently hydrogen; alkyl alkenyl, alkynyl, alkoxy, cycloalkyl, oyclealkylalkyl …
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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 10, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 10, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 10, 2015.
- 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
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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.