Patents by Inventor Koichi Yoshiura

Koichi Yoshiura 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).

  • Process for preparing aminoanthraquinones
    Patent number: 4046785
    Abstract: A process for preparing aminoanthraquinones of high purity, which comprises catalytically hydrogenating nitroanthraquinones in the suspended state in an aqueous medium in the presence of a hydrogenating catalyst. In a preferred embodiment, the catalytic hydrogenation may be carried out in the presence of an organic or inorganic base, followed, if desired, by oxidizing the hydrogenation product.
    Type: Grant
    Filed: December 18, 1975
    Date of Patent: September 6, 1977
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yutaka Hirai, Katsuharu Miyata, Tagui Osawa, Muneyasu Samecima, Ken Mukai, Koichi Yoshiura, Hidetoshi Mori
  • Process for purifying 1-aminoanthraquinone
    Patent number: 3984425
    Abstract: A process for purifying 1-aminoanthraquinone, which comprises hydrogenating crude 1-aminoanthraquinone containing diaminoanthraquinones in an aqueous medium in the presence of a base using a hydrogenating catalyst to form a mixture comprising 1-aminoanthrahydroquinone and the corresponding diaminoanthrahydroquinones, partially oxidizing the mixture, removing water-insoluble materials from the oxidation product, and then oxidizing the remaining water-soluble residue.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: October 5, 1976
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Hidetoshi Mori, Ken Mukai, Koichi Yoshiura