Patents by Inventor Kazuyoshi Katamoto

Kazuyoshi Katamoto 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).

  • Method for separating cephalosporins
    Patent number: 4535155
    Abstract: The interseparating of desacetyl-cephalosporin C, desacetoxy-cephalosporin C and cephalosporin C can be accomplished by adsorbing these available cephalosporins on activated carbon and effecting a fractional elution thereof with water containing 0 to 20 percent (V/V) of an organic solvent or solvents.
    Type: Grant
    Filed: August 11, 1983
    Date of Patent: August 13, 1985
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Kiyoshi Nara, Kazuyoshi Katamoto, Kazuhiko Ohta
  • Method for concentrating .beta.-lactam antibiotic solution
    Patent number: 4455306
    Abstract: The present invention relates to a method for concentrating a dilute aqueous solution of a .beta.-lactam antibiotic which is readily susceptible to heat, by subjecting a dilute aqueous solution of a .beta.-lactam antibiotic, said solution containing 2 to 20% (v/v) of a lower alcohol, to concentration by means of a permeable membrane made of poly(ether/amide) or polybenzimidazolone.
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: June 19, 1984
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Kiyoshi Nara, Kazuyoshi Katamoto, Sadao Ohkido, Isao Yamamoto, Hiroshi Yanome
  • Mildiomycin analogs and a method of production
    Patent number: 4296107
    Abstract: A compound of the formula: ##STR1##wherein R is hydrogen, a halogen atom or a lower alkyl group, or an acid salt thereof, possesses a superior fungicidal and acaricidal activity suitable for plant uses.
    Type: Grant
    Filed: August 19, 1980
    Date of Patent: October 20, 1981
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Takashi Suzuki, Hidekazu Sawada, Kazuyoshi Katamoto
  • Production of deacetoxycephalosporin C
    Patent number: 3979260
    Abstract: Deacetoxycephalosporin C can be produced with advantage by fermentation of a microorganism which belongs to the genus Streptomyces, Cephalosporium, Emericellopsis, Paecilomyces, Anixiopsis, Arachnomyces or Spriroidium and is capable of producing deacetoxycephalosporin C. Deacetoxycephalosporin C is a useful antibiotic as such or can be used as a starting material for the production of other various cephalosporin antibiotics.
    Type: Grant
    Filed: June 14, 1974
    Date of Patent: September 7, 1976
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Yoshio Nakao, Kazuaki Kitano, Kazuhiko Kintaka, Shigeru Suzuki, Kazuyoshi Katamoto, Kiyoshi Nara