Patents by Inventor Yasushi Tomiku

Yasushi Tomiku 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 fine particles of .epsilon. iron carbide and method for producing the same
    Patent number: 5552073
    Abstract: Ferromagnetic granular ultrafine particles consisting essentially of .epsilon.' iron carbide represented by the composition formula:.epsilon.'-Fe.sub.2.2 Chaving an average particle size of about 0.01 to 0.2 .mu.m, and ferromagnetic acicular ultrafine particles consisting essentially of .epsilon.' iron carbide represented by the composition formula:.epsilon.'-Fe.sub.2.2 Chaving a major axis of about 0.05 to 0.5 .mu.m, a minor axis of about 0.01 to 0.06 and an axial ratio of 4 to 20, which have good coercive force and a small magnetic domain.
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: September 3, 1996
    Assignees: Seisan Kaihatsu Kagaku Kenkyusho, Kyodo Oxygen Co., Ltd.
    Inventors: Yasushi Tomiku, Hideaki Takano, Yoshichika Bando