Patents by Inventor Miyuki Sakuta

Miyuki Sakuta 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).

  • Zirconia based sintered body excellent in durability and wear resistant parts using the same
    Patent number: 6905993
    Abstract: The present invention relates to a zirconia based sintered body excellent in durability, characterized in that in Y2O3-toughened zirconia based sintered body, (a) ZrO2 contained therein is mainly composed of tetragonal ZrO2, and the sintered body contains Y2O3 as a secondary component and further SiO2 and Al2O3 as a third component; (b) the sintered body has a molar ratio of Y2O3/ZrO2 in the range of 1.5/98.5 to 4/96; (c) the sintered body has a SiO2 content of 0.05 to 2.5 wt %; (d) the sintered body has a Al2O3 content of 0.05 to 3.0 wt %; (e) the sintered body has an average crystal grain diameter of 0.7 ?m or less; (f) SiO2 (wt %)×average crystal grain diameter (?m) takes a value ranging from 0.03 to 0.5; (g) the sintered body contains at least one oxide of Na2O, K2O, CaO and Fe2O3 as an impurity and a weight ratio of SiO2/(total amount of the impurity) is 5 or more; and (h) the sintered body has a bulk density of 5.
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: June 14, 2005
    Assignee: Nikkato Corporation
    Inventors: Miyuki Sakuta, Hiroshi Onishi, Toshio Kawanami
  • Zirconia based sintered body excellent in durability and wear resistant parts using the same
    Publication number: 20040162214
    Abstract: The present invention relates to a zirconia based sintered body excellent in durability, characterized in that in Y2O3-toughened zirconia based sintered body,
    Type: Application
    Filed: September 2, 2003
    Publication date: August 19, 2004
    Inventors: Miyuki Sakuta, Hiroshi Onishi, Toshio Kawanami