Method for production of cephalosporin compounds
CA 1293718 C · Owner: Takeda Chemical Industries, Ltd. · Inventors: Ishibashi, Yukio; Naito, Kenzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
24205-711, Abstract, A method for producing a compound of the formula; I, which R stands for a hydrogen atom, an acyl group or a protective group other than acyl groups Q stands for a, hydrogen atom or an ester residue Y stands for the residue, of a nucleophilic compound and the dotted line snows the double bond at 2- or 3- position of the cephem ring or a salt thereof, characterized by allowing a compound of the formula;, II, R, Q and the dotted line are of the same meaning as above or a salt thereof to react with a nucleophilic compound or a salt thereof and a compound of the formula; III, wherein R1, R2, and R3 independently stand for a hydrocarbon group having not more than 8 carbon …
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
- Granted December 31, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 31, 2008.
- 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.