Patents by Inventor Masanao Nakagawa

Masanao Nakagawa 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).

  • Production of high-density carbon materials
    Patent number: 4202868
    Abstract: In the production of high-density carbon materials directly from a green coke without the aid of a binder by a process comprising molding a finely pulverized green coke as such by pressing in a mold, demolding and baking the molded green coke to form a sintered carbon material and, if desired, graphitizing the sintered material, a serious disadvantage that there occur laminar cracks in the molded green coke at the demolding stage is avoided by molding the green coke in the form of a composition comprising a finely pulverized green coke in intimate admixture with a small amount of water or a certain monohydric alcohol.
    Type: Grant
    Filed: June 28, 1977
    Date of Patent: May 13, 1980
    Assignee: Maruzen Petrochemical Co., Ltd.
    Inventors: Kiyoshige Hayashi, Masanao Nakagawa, Kazuo Ozaki, Yoshiharu Ito
  • Process for producing micro-beads and product containing the same
    Patent number: 3956436
    Abstract: Micro-beads having a carbonaceous structure are produced by a process comsing heating pitch at about 350-500.degree.C to form optically anisotropic spherules, extracting the resulting spherules with an organic solvent to remove substantially all remaining pitch therefrom, and then carbonizing the pitch-free spherules in a non-oxidizing atmosphere. The optically anisotropic micro-beads substantially free of pitch can be shaped to a desired form and then carbonized to produce a shaped carbonaceous structure. If the carbonizing temperature is above about 1500.degree.C, a graphite crystalline structure results.
    Type: Grant
    Filed: April 5, 1973
    Date of Patent: May 11, 1976
    Assignee: Director-General of the Agency of Industrial Science and Technology
    Inventors: Hidemasa Honda, Yasuhiro Yamada, Hitoo Kakiyama, Takeshi Imamura, Masanao Nakagawa
  • Thiohumic acid, a process for preparing same, and its use for absorbing heavy metal ions
    Patent number: 3932494
    Abstract: The compound thiohumic acid resulting from replacing at least a part of the carboxyl groups in humic acid by thiocarboxyl groups, i.e., ##EQU1## as well as a heavy metal adsorbent containing thiohumic acid as its active ingredient. This new compound is obtained by treating humic acid with a halogenating agent to form humic acid halide and treating such halide with a thiolating agent.
    Type: Grant
    Filed: December 20, 1973
    Date of Patent: January 13, 1976
    Assignee: Director-General of the Agency of Industrial Science and Technology
    Inventors: Hisayoshi Yoshida, Takato Nakamura, Masanao Nakagawa, Seiji Arita, Toshiharu Miki