Cephem compounds
CA 2276097 A1 · Owner: Yamazaki, Hiroaki · Inventors: Kawashima, Seiichiro; Hiramatsu, Keiichi; Yamazaki, Hiroaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cephem compounds of general formula (I) wherein formula (a) represents , benzene pyridine, pyrazine or a five-membered aromatic heterocycle (containing oxygen or sulfur as the ring atom) provided when is a five-, membered aromatic heterocycle R4 is absent; X and Y each represents hydrogen CXY represents C=N-OR5 (wherein R5 represents hydrogen halo-C1-6 alkyl or C3-, 7 cycloalkyl); R1 represents phenyl furyl, thienyl, thiazolyl (which may be substituted by amino), tetrazolyl or thiadiazolyl; and R2 R3 and R4 each , represents hydrogen, halogen hydroxyl, nitro, C1-6 alkoxyl, trifluoromethyl isothiuronium-C1-6 alkyl, amino-C1-6 alkyl halo-C1-6 alkyl, morpholino, piperidino or piperazinyl.
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 December 25, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 25, 2019.
- 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.