Patents by Inventor Yuuji Yamanishi

Yuuji Yamanishi 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).

  • Good machinability Fe-based sintered alloy and process of manufacture therefor
    Patent number: 6228138
    Abstract: Machinability is drastically improved while maintaining some degree of hardness in an Fe-based sintered alloy. A good machinability Fe-based sintered alloy has an overall composition of, in percent by weight, at least one element selected from the group consisting of P in an amount of 0.1 to 1.0% and Si in an amount of 2.0 to 3.0%, B in an amount of 0.003 to 0.31%, 0 in an amount of 0.007 to 0.69%, C in an amount of 0.1 to 2.0%, and the balance consisting of Fe and unavoidable impurities, has a matrix hardness ranging from Hv 150 to 250, and has free graphite dispersed therein.
    Type: Grant
    Filed: November 4, 1999
    Date of Patent: May 8, 2001
    Assignee: Hitachi Powdered Metals Co., Ltd.
    Inventors: Yuuji Yamanishi, Tadayuki Tsutsui, Kei Ishii