Patents by Inventor Yoshihisa Saito

Yoshihisa 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).

  • Halogenated penam derivatives and the preparation thereof
    Patent number: 4009159
    Abstract: A penam derivative having the formula: ##STR1## wherein X represents a halogen atom, and wherein R.sub.1 represents an amino or acylamino, and R.sub.3 represents a radical selected from the group consisting of carboxy, ester, acid amide, acid anhydride, acid halide, and acid azide.
    Type: Grant
    Filed: December 21, 1973
    Date of Patent: February 22, 1977
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Takashi Kamiya, Yoshihisa Saito, Tsutomu Teraji, Osamu Nakaguti, Teruo Oku, Hitoshi Nakamura, Masashi Hashimoto
  • Process for the ring expansion of penicillins to cephalosporin compounds
    Patent number: 3993646
    Abstract: A process for producing a 2-cephem or 3-cephem derivative compound of the formula: ##SPC1##Wherein R.sub.1 represents a substituted or unsubstituted amino radical and R.sub.4 represents hydrogen or a radical selected from the group consisting of carboxy, protected carboxy, ester, acid amide, acid anhydride, acid halide, acid azide and carboxy salt, and the dotted line indicates the alternate bond structure providing 3-cephem or 2-cephem, which comprises:Reacting a halogenated derivative selected from the group consisting of a halogenated penam derivative having the formula: ##SPC2##A halogenated cepham derivative of the formula: ##SPC3##Wherein X represents a halogen atom, R.sub.3 represents a radical selected from the group consisting of carboxy, protected carboxy, ester, acid amide, acid anhydride, acid halide, acid azide and carboxy salt, and R.sub.1 is as defined above, or mixtures thereof with a dehydrohalogenoic acid reagent.
    Type: Grant
    Filed: January 4, 1974
    Date of Patent: November 23, 1976
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Takashi Kamiya, Yoshihisa Saito, Tsutomu Teraji, Osamu Nakaguti, Teruo Oku, Hitoshi Nakamura, Masashi Hashimoto