Patents by Inventor Norimitsu Mukae

Norimitsu Mukae 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).

  • WC-base composite ceramic sintered compact
    Patent number: 6551954
    Abstract: A WC-based composite ceramics sintered body consisting of 40 volume % to 90 volume % of WC including solid-solved oxygen represented by a chemical formula of WCxOy (where 0.005<y/x+y<0.05), with the remainder being partially stabilized ZrO2 and inevitable impurities, wherein partially stabilized ZrO2 includes one or more of stabilizers selected from the group consisting of Y2O3, CeO2 and MgO. A prepared powder of raw material is held in an atmosphere containing oxygen in a temperature range of 200° C. to 600° C. for 0.1 hour to 3 hours to provide WC grains including solid-solved oxygen represented by a chemical formula of WCxOy (where 0.005<y/x+y<0.05). Partially stabilized Zro2 including one or more of stabilizers selected from the group consisting of Y2O3, CeO2 and MgO is used as a phase for filling up the grain boundary of the WC grains.
    Type: Grant
    Filed: July 18, 2001
    Date of Patent: April 22, 2003
    Assignee: Nippon Tungsten Co., Ltd.
    Inventors: Mitsuyoshi Nagano, Shigeya Sakaguchi, Norimitsu Mukae, Kouki Minamoto, Toyoshige Sasaki