Patents by Inventor Maeda Masayuki

Maeda Masayuki 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).

  • Sintered high vanadium high speed steel and method of making same
    Patent number: 4519839
    Abstract: A sintered high vanadium high speed steel with an excellent hardness and ductility of composition C 1.4-6.2%, W+2 Mo (W-equivalent) 10.0-24.0%, Cr 3.0-6.0%, V 8.5-28%, Co less than 17%, the remainder Fe and inevitable impurities, and a method of producing same.It can be produced by the steps of commingling the alloy constituents in the form of pulverulent oxides and carbon powder, heating the mixture in a stream of hydrogen, thereby reducing the mixture by the carbon and hydrogen simultaneously to yield an alloy powder, adjusting the composition and the grain size of the obtained alloy powder, pressing the alloy powder to a compact, sintered the compact in a vacuum, and finally converting the matrix of the sintered body into martensite by heat treatment.
    Type: Grant
    Filed: October 3, 1984
    Date of Patent: May 28, 1985
    Assignees: The Furukawa Electric Co., Ltd., Kanto Denka Kogyo Co., Ltd., Fujidie Co., Ltd.
    Inventors: Ishibachi Toyoaki, Yoshihara Minoru, Takuma Takashi, Fuke Yasunori, Maeda Masayuki