Diaminobenzoic acid derivatives
CA 2109975 A1 · Owner: Kump, Wilhelm · Inventors: Trinks, Uwe; Kump, Wilhelm; Traxler, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Diaminobenzoic acid derivatives The invention relates to compounds of the formula I (I), in which A1 and A2 are hydrogen, unsubstituted or substituted lower alkyl lower alkenyl, or lower alkynyl, heterocyclyl-lower-alkyl acyl, lower alkylsulfonyl or arylsulfonyl or, together are unsubstituted or substituted lower alkylene; Ar1 and Ar2 are aryl heteroaryl, or unsubstituted or substituted cycloalkyl X is O or S, Y is amino, substituted amino substituted lower alkoxy or unsubstituted or substituted lower alkylthio; or if X is O and Z, is substituted methyl Y is hydroxyl; and Z is substituted methyl carboxyl or esterified or, amidated carboxyl or thiocarboxyl; or Y and Z together are …
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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 November 25, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 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
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.