Patents Represented by Law Firm Wenderoth, Lind & Ponach
  • 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