Patents by Inventor Hiroyuki Araragi

Hiroyuki Araragi 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).

  • Oxide-dispersion-strengthened heat-resistant chromium-based sintered alloy
    Patent number: 5302181
    Abstract: An oxide-dispersion-strengthened sintered alloy improved in oxidation resistance and compressive strength for use at high temperatures of at least 1350.degree. C. The alloy includes a matrix of a metal consisting substantially or predominantly of Cr, and 0.2 to 2.0% by weight of Y.sub.2 O.sub.3 uniformly dispersed in the matrix. The Y.sub.2 O.sub.3 as uniformly dispersed is up to 0.1 .mu.m in mean particle size.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: April 12, 1994
    Assignee: Kubota Corporation
    Inventors: Toshiaki Morichika, Takashi Onishi, Hiroshi Yamamoto, Koichi Yanai, Hiroyuki Araragi
  • Heat-resistant materials
    Patent number: 5288228
    Abstract: A heat-resistant material having excellent high-temperature strength and high oxidation resistance at temperatures exceeding 1300.degree. C. The material is a heat-resistant Cr-Fe alloy including at least 60% of Cr and at least 5% of Fe, and having a mean grain size of at least 50 .mu.m and having a melting point of at least 1600 .degree. C., or a composite material composed of the said heat-resistant alloy serving as a metal matrix and a ceramic, and containing up to 40% by volume of a dispersed ceramic phase in the metal matrix.
    Type: Grant
    Filed: September 8, 1992
    Date of Patent: February 22, 1994
    Assignee: Kubota Corporation
    Inventors: Hideo Fujita, Jun Funakoshi, Takahiro Kaba, Akira Shinosaki, Hiroyuki Araragi