Hydroxypyridonecarboxamides, their manufacture and use
CA 2082572 A1 · Owner: Theobald, Hans · Inventors: Von Deyn, Wolfgang; Nuebling, Christoph; Kappe, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/42842, Hydroxypyridonecarboxamides their manufacture and use, ABSTRACT OF THE DISCLOSURE: Hydroxypyridonecarboxamides of the formula I (I), where:, x is oxygen or sulfur;, R1 R2 independently of each other are hydrogen alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl or alkoxy, and these organic radicals are substituted or unsubstituted;, R3 is hydrogen, alkyl haloalkyl, alkoxy, haloalkoxy, alkylthio haloalkylthio, halogen or nitro;, R4 is alkyl alkenyl, alkynyl, cycloalkyl, alkoxy, alkylthio, phenyl or a 5- or 6-membered heterocyclic aliphatic or aromatic radical containing from one to three heteroatoms selected from the group consisting of oxygen, sulfur and nitrogen and …
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 10, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 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.