Cyclic urea and cyclic amide derivatives
CA 2371642 A1 · Owner: Zhang, Puwen · Inventors: Jones, Todd K.; Zhi, Lin; Wrobel, Jay E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides compounds of formula (I) wherein: A B and D are N or , CH, with the proviso that A B and D can not all be CH; R1 and R2 are independent substituents selected from H CORA, NRBCORA, or optionally , substituted alkyl alkenyl, alkynyl, cycloalkyl, aryl, or groups; or R1 and R2 are fused to form an optionally substituted 3 to 8 membered spirocyclic alkyl alkenyl or heterocyclic ring; RA is H or optionally substituted alkyl aryl, alkoxy, or aminoalkyl; RB is H, C1 to C3 alkyl or substituted C1 to C3 alkyl; , R3 is H OH, NH2, or optionally substituted alkyl or alkenyl, or CORC; Rc is , H or optionally substituted alkyl aryl, alkoxy, or aminoalkyl; R4 is a , substituted …
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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 May 1, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 1, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2022.
- 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.