Patents by Inventor Takehiko Hagio

Takehiko Hagio 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).

  • Process for producing zirconia yttria grinding media used for grinding magnetic coating powder
    Patent number: 4430279
    Abstract: This invention discloses zirconia-containing grinding media in the preparation of magnetic disc coating and method for producing such grinding media. The grinding media essentially consists of zirconia-sintered body containing 3.6% to 8.0% by weight of yttrium oxide, the zirconia sintered body having a means grain size of less than 2 .mu.m and the relative theoretical density of more than 98.0%.
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: February 7, 1984
    Assignee: Nippon Tungsten Co., Ltd.
    Inventors: Takehiko Hagio, Michito Miyahara, Mitsuhiko Furukawa
  • Sintered bodies Al.sub.2 O.sub.3 -TiC-TiO.sub.2 continuing yttrium (y)
    Patent number: 4356272
    Abstract: Sintered bodies having improved sinterability and toughness consist essentially of: (1) 100 parts by weight of titanium carbide, titanium oxide and aluminum oxide, the titanium carbide and titanium oxide accounting for 15 to 60 percent by weight and the aluminum oxide accounting for 85 to 40 percent by weight, the amount of titanium oxide relative to the titanium carbide and titanium oxide being 5 to 15 percent by weight, and (2) 0.039 to 1.575 parts by weight of yttrium. Sintering aids may include at least one of the oxides of magnesium, nickel, molybdenum, chromium, cobalt, iron and manganese.
    Type: Grant
    Filed: March 24, 1981
    Date of Patent: October 26, 1982
    Assignee: Nippon Tungsten Co., Ltd.
    Inventors: Yutaka Kanemitsu, Takehiko Hagio, Mitsuhiko Furukawa, Michito Miyahara, Yoshimichi Hara, Takashi Kitahira