Patents by Inventor Seiichi Kirigaya

Seiichi Kirigaya 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).

  • Process for producing a sintered product of copper-infiltrated iron-base alloy and a two-layer valve seat produced by this process
    Patent number: 4485147
    Abstract: A process for producing a Cu-infiltrated sintered Fe-base material without requiring a separate Cu infiltration step is disclosed. The process comprises the steps of preparing two powder mixes, one having a predetermined composition with a powder of infiltrating material containing Cu powder or Cu alloy powder as the primary component, and the other having a predetermined composition without said powder of infiltrating material; pressing the two powder mixes into a compact having said powder of infiltrating material present locally; and sintering the compact under ordinary conditions so as to cause the infiltrant to penetrate into the infiltrant-free area simultaneously with the sintering.Also disclosed is a two-layer valve seat produced by this process.
    Type: Grant
    Filed: September 1, 1983
    Date of Patent: November 27, 1984
    Assignee: Mitsubishi Kinzoku Kabushiki Kaisha
    Inventors: Yoshio Nishino, Seiichi Kirigaya