Patents by Inventor Kazuaki Yajima

Kazuaki Yajima 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).

  • Copper-based alloy excelling in corrosion resistance, method for production thereof, and products made of the copper-based alloy
    Patent number: 6395110
    Abstract: The present invention provides a copper-based alloy characterized by: having a composition of 58.0 to 63.0% by weight of Cu, 0.5 to 4.5% by weight of Pb, 0.05 to 0.25% by weight of P, 0.5 to 3.0% by weight of Sn, 0.05 to 0.30% by weight of Ni, and the balance of Zn and inevitable impurities; having a texture uniformly fragmented to acquire excellent corrosion resistance and hot working property; having undergone a given drawing work and heat treatment to acquire excellent mechanical properties including tensile strength, proof strength and elongation; and having internal stress thoroughly removed to excel in stress-corrosion cracking resistance.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: May 28, 2002
    Assignee: Kitz Corporation
    Inventors: Tadao Mizoguchi, Kozo Itoh, Kazuaki Yajima
  • COPPER-BASED ALLOY EXCELLENT IN CORROSION RESISTANCE, HOT WORKABILITY, AND RESISTANCE TO STRESS CORROSION CRACKING, AND PROCESS FOR PRODUCING THE COPPER-BASED ALLOY
    Publication number: 20020011288
    Abstract: The present invention provides a copper-based alloy characterized by: having a composition of 58.0 to 63.0% by weight of Cu, 0.5 to 4.5% by weight of Pb, 0.05 to 0.25% by weight of P, 0.5 to 3.0% by weight of Sn, 0.05 to 0.30% by weight of Ni, and the balance of Zn and inevitable impurities; having a texture uniformly fragmented to acquire excellent corrosion resistance and hot working property; having undergone a given drawing work and heat treatment to be exalted in mechanical properties including tensile strength, proof strength and elongation; and having internal stress thoroughly removed to excel in stress-corrosion cracking resistance.
    Type: Application
    Filed: October 7, 1999
    Publication date: January 31, 2002
    Inventors: TADAO MIZOGUCHI, KOZO ITOH, KAZUAKI YAJIMA
  • Copper-based alloy
    Patent number: 5507885
    Abstract: A copper-based alloy, viz. a dezincification-resistant brass, excels in various properties such as resistance to dezincification, hot forgeability and machinability and, therefore, tolerates use particularly in the atmosphere of a corrosive aqueous solution. The brass of one species has a composition of 59.0 to 62.0 wt % of Cu, 0.5 to 4.5 wt % of Pb, 0.05 to 0.25 wt % of P, 0.5 to 2.0 wt % of Sn, 0.05 to 0.30 wt % of Ni, with or without 0.02 to 0.15 wt % of Ti, and the balance of Zn and unavoidable impurities. The brass of another species has a composition of 61.0 to 63.0 wt % of Cu, 2.0 to 4.5 wt % of Pb, 0.05 to 0.25 wt % of P, 0.05 to 0.30 wt % of Ni, with or without 0.02 to 0.15 wt % of Ti, and the balance of Zn and unavoidable impurities.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: April 16, 1996
    Assignee: Kitz Corporation
    Inventors: Sadao Sakai, Setsuo Kaneko, Kazuaki Yajima, Kazuhiko Kobayashi