Patents by Inventor Shoichiro Fujii

Shoichiro Fujii 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).

  • Thiazole derivatives
    Patent number: 4695639
    Abstract: A novel aminothiazoleacetic acid derivative which is an advantageous synthetic intermediate for .beta.-lactam antibiotics, and its production method and use. Starting with diketene, the production method comprises the following squence of steps. ##STR1## (In the above formulas, R is lower alkyl or phenyl; R.sub.1 and R.sub.2 each are hydrogen or lower alkyl; X and X' each are halogen; W is S or SO.sub.
    Type: Grant
    Filed: January 6, 1984
    Date of Patent: September 22, 1987
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Kunio Takanohashi, Tsuneaki Yoshida, Shoichiro Fujii
  • Process for producing desacetoxycephalosporin derivatives by heating a penicillin-1-oxide in presence of an organic sulfide
    Patent number: 4122258
    Abstract: Penicillin-1-oxides are rearranged into the corresponding 3-desacetosycephalosporin derivatives in an inert organic solvent in the concomitant presence of an acid catalyst and an organic sulfide in a good yield and with a high purity.
    Type: Grant
    Filed: March 13, 1973
    Date of Patent: October 24, 1978
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Shoichiro Fujii, Michiyuki Sendai, Kenzo Naito, Masayasu Kato