Cephalosporin derivatives
CA 1104125 B · Owner: Takeda Chemical Industries, Ltd. · Inventors: Miyawaki, Toshio; Minamida, Isao; Yamaoka, Masayoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A compound of the formula:, wherein R1 represents hydrogen or an alkyl group X represents, oxygen or sulfur or a group of formula -NR2 (where R2 is hydrogen or an alkyl group and in the case of alkyl it may form a ring, joined with R1), and Y represents an acetoxy group or a group of formula -SR3 (where R3 is a 5 or 6 membered ring containing one to four nitrogens as hetero atoms which may be in the oxide form or. in addition to the nitrogen atom or atoms one or, more other hetero atoms selected from the group consisting of oxygen and sulfur, said ring being optionally substituted with one or more of a lower alkyl; a lower alkoxyl; amino; mercapto; hydroxyl; …
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 January 22, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 22, 1997.
- 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.