Patents by Inventor Takeo Tsukada

Takeo Tsukada 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).

  • Dust core, ferromagnetic powder composition therefor, and method of making
    Patent number: 6102980
    Abstract: A ferromagnetic powder composition for dust cores contains a ferromagnetic metal powder and 0.1-15% by volume based on the powder of titania sol and/or zirconia sol. The composition is pressure molded and desirably annealed into a dust core which exhibits a high magnetic flux density, low coercivity, low loss and high mechanical strength.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: August 15, 2000
    Assignee: TDK Corporation
    Inventors: Masami Endo, Takeo Tsukada, Masaaki Kanasugi, Kazuhiro Okada, Hideharu Moro, Norishige Yamaguchi, Toshiaki Yamada, Hideki Kitashima
  • Dust core, iron powder therefor and method of making
    Patent number: 5800636
    Abstract: A dust core is prepared from an iron powder with a particle size of 75-200 .mu.m having added thereto 0.015-0.15 wt % of silica sol, 0.05-0.5 wt % of a silicone resin, and 10-50 wt % based on the silicone resin of an organic titanium compound. By subjecting the iron powder to a curing treatment at 50.degree.-250.degree. C., compacting the powder, and annealing in an inert atmosphere at 550.degree.-650.degree. C., there is obtained a dust core consisting essentially of iron powder particles with a particle size of 75-200 .mu.m, 0.03-0.1% by weight of Si, 15-210 ppm of Ti, and 300-2,500 ppm of oxygen.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: September 1, 1998
    Assignee: TDK Corporation
    Inventors: Takeo Tsukada, Masaaki Kanasugi, Masataka Miyashita, Kazuhiro Okada, Norishige Yamaguchi