Dicarboximides
CA 2045253 C · Owner: Kuekenhoehner, Thomas · Inventors: Hamprecht, Gerhard; Kuekenhoehner, Thomas; Ditrich, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
formulae Ia, Ib and Ic Dicarboximides of the (see formula Ia, Ib, Ic), where X is oxygen or sulfur R1 is hydrogen, halogen, cyano, alkyl, cycloalkyl alkenyl, alkynyl, alkoxy, alkenyloxy, alkynyloxy alkylthio, haloalkoxy, haloalkylthio, alkylsulfonyl haloalkyl-sulfonyl, phenyl, phenylalkyl phenoxy or phenylthio, a, 5-membered or 6-membered saturated or aromatic heterocyclic radical containing one or two hetero atoms selected from the group consisting of oxygen sulfur and, nitrogen, where the stated organic radicals may be further substituted, and, R2 is hydrogen hydroxyl, alkoxy, alkyl, cycloalkyl, alkenyl alkynyl, di-C1-C4-alkylamino, a 5-membered or 6-membered heterocyclic saturated or …
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 June 21, 1991 and granted May 8, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 2013.
- 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.