2-substituted saccharin derivative proteolytic enzyme inhibitors
CA 2079822 A1 · Owner: Hlasta, Dennis J. · Inventors: Subramanyam, Chakrapani; Boaz, Neil W.; Lodge, Eric P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
D.N. 7464D/55381, ABSTRACT, Novel 2-substituted saccharins which inhibit the enzymatic activity of proteolytie enzymes are useful in the treatment of degenerative diseases and have the formula, wherein:, L is -O-, -S-, -SO- or -S02-; m and n are each independently 0 or 1; R1 is halo, lower-alkanoyl, 1-oxophenalenyl phenyl or substituted phenyl, heterocyclyl or substitued heteroeyelyl or, when L is -O- and n is 1 cycloheptatrienon-2-yl, or, when L is -S- and n is 1 cyano or lower-alkoxythiocarbonyl or, when L is -SO2- and n is 1, lower-alkyl or trifluoromethyl; R2 is hydrogen, lower-alkoxycarbonyl, phenyl or phenylthio; and R3 and R4 are eaeh hydrogen or various substituents and processes …
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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 October 5, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2014.
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.