Patents by Inventor Noritoshi Utsuno

Noritoshi Utsuno 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).

  • Ferromagnetic metal particles and preparation process thereof
    Patent number: 5188898
    Abstract: Ferromagnetic metal particles the surface layer of which comprises laminatedly covered films of a ferrite compound having a spinel structure of at least one metal selected from cobalt, zinc, manganese, aluminum, chromium, nickel and copper and iron and a preparation process thereof.The particles can be used as a high density magnetic recording medium.
    Type: Grant
    Filed: April 4, 1991
    Date of Patent: February 23, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Kimiteru Tagawa, Seiichi Takahashi, Noritoshi Utsuno, Hideki Umehara, Fujio Hayashi, Shigeo Kiba, Satoru Suda