Patents by Inventor Shigeru Ozawa

Shigeru Ozawa 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).

  • Method of the preparation of high density sintered alloys based on iron and copper
    Patent number: 4437890
    Abstract: A method of the preparation of an improved high-density sintered alloy composed mainly or iron and up to 50 wt. % of copper, in which boron is added in an amount of no less than 0.03% to suppress or limit the copper growth phenomenon during sintering. The alloys prepared by the present method undergo less dimensional changes during sintering and are thus of a very high density as compared with the conventional alloys of the same type.
    Type: Grant
    Filed: March 21, 1983
    Date of Patent: March 20, 1984
    Assignee: Hitachi Powdered Metals Co., Ltd.
    Inventors: Tadao Hayasaka, Masahiro Suzuki, Shigeru Ozawa, Yoshiaki Takeya