Patents by Inventor Tokio Saito

Tokio Saito has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Penicillin and cephalosporin derivatives and process for preparing the same
    Patent number: 4064137
    Abstract: Novel penicillin and cephalosporin derivatives possessing interferon inducibility and represented by the formula ##STR1## wherein Y represents a hydrogen atom, a halogen atom a nitro group, an alkoxy group or an alkyl group; M represents a protective group for a hydroxyl or carboxyl group; Z represents a group ##STR2## or a group ##STR3## in which D is a hydrogen atom, an acyloxy group, a carbamoyloxy group or a substituted or unsubstituted heterocyclic thio group; A represents a cyano group, a carboalkoxy group or a nitro group; and B represents a hydrogen atom, a cyano group, a carboalkoxy group or a nitro groupAnd process for preparing the same.
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: December 20, 1977
    Assignee: Sankyo Company Limited
    Inventors: Koichi Hirai, Yuji Iwano, Tokio Saito, Tetsuo Hiraoka, Yukichi Kishida, Takuzo Nishimura