Benzenesulfonamide derivatives
CA 2127123 A1 · Owner: Kosaka, Nobuo · Inventors: Kinoshita, Iwao; Sugawara, Katsura; Gomi, Katsushige
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to benzenesulfonamide derivatives represented by Formula (I): I, in which R1 and R2 independently represent hydrogen or lower alkanoyl; and R3 and R4 independently represent hydrogen lower alkyl, cycloalkyl, substituted or unsubstituted polycycloalkyl, substituted aryl, or a substituted or unsubstituted heterocyclic group, or R3 and R4 are combined together with the adjacent nitrogen atom to form a substituted or unsubstituted aliphatic heterocyclic group or a pharmaceutically acceptable salt thereof. The derivatives are useful as therapeutic agents for osteoporosis.
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 5, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 5, 2014.
- 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.