Cephalosporin derivatives
CA 1215971 A · Owner: Takeda Chemical Industries, Ltd. · Inventors: Yoshimura, Yoshinobu; Yashiki, Takatsuka; Hamaguchi, Naoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cephalosporin derivatives of the formula: wherein R1 is methyl or ethyl and R2 is a straight-chain or branched alkyl group of 5 to 7 carbon atoms and their pharmaceutically acceptable salts which are, effective as orally administrable antibiotic agents against both gram-positive and gram-negative bacteria and, the production and compositions thereof are proposed.
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 30, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 30, 2003.
- 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.