Patents by Inventor Kunio Hanata

Kunio Hanata 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).

  • Production process for Fe-based sintered alloy valve seat
    Patent number: 6793876
    Abstract: A valve seat is produced by (a) using, as a raw material powder for forming a matrix, an Fe-based alloy powder with an average particle size of 20 to 50 &mgr;m, and using, as a raw material powder for forming a hard dispersion phase, a Co-based alloy powder with an average particle size of 20 to 50 &mgr;m, (b) conducting solid phase sintering, under vacuum, of a pressed compact formed from a mixed powder generated by mixing the Co-based alloy powder into the Fe-based alloy powder in sufficient quantity to account for 25 to 35% by weight of the combined weight with the Fe-based alloy powder, and causing the Co, Cr and Si components of the Co-based alloy powder to diffuse and migrate into the matrix, and the Fe component of the Fe-based alloy powder to diffuse and migrate concurrently into the hard dispersion phase, thereby markedly improving adhesion of the hard dispersion phase to the matrix, and forming, as a result, an Fe-based sintered alloy substrate with a porosity of 10 to 20%, and comprising an Fe&mdas
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: September 21, 2004
    Assignee: Mitsubishi Materials Corporation
    Inventors: Atsushi Kawakami, Kazuyuki Hoshino, Kunio Hanata
  • Production process for Fe-based sintered alloy valve seat
    Publication number: 20040131492
    Abstract: A valve seat is produced by (a) using, as a raw material powder for forming a matrix, an Fe-based alloy powder with an average particle size of 20 to 50 &mgr;m, and using, as a raw material powder for forming a hard dispersion phase, a Co-based alloy powder with an average particle size of 20 to 50 &mgr;m, (b) conducting solid phase sintering, under vacuum, of a pressed compact formed from a mixed powder generated by mixing the Co-based alloy powder into the Fe-based alloy powder in sufficient quantity to account for 25 to 35% by weight of the combined weight with the Fe-based alloy powder, and causing the Co, Cr and Si components of the Co-based alloy powder to diffuse and migrate into the matrix, and the Fe component of the Fe-based alloy powder to diffuse and migrate concurrently into the hard dispersion phase, thereby markedly improving adhesion of the hard dispersion phase to the matrix, and forming, as a result, an Fe-based sintered alloy substrate with a porosity of 10 to 20%, and comprising an Fe&mdas
    Type: Application
    Filed: September 30, 2003
    Publication date: July 8, 2004
    Applicant: MITSUBISHI MATERIALS CORPORATION
    Inventors: Atsushi Kawakami, Kazuyuki Hoshino, Kunio Hanata