Patents Assigned to Nippon Telecommunication Engineering Company Limited
  • Method for manufacture of high-strength high-electroconductivity copper alloy
    Patent number: 4439247
    Abstract: A copper alloy which is high in strength and electroconductivity is manufactured by casting, without chill casting, a copper alloy mass substantially consisting of copper and containing 0.2 to 1.5% by weight of chromium and 0.01 to 0.5% by weight of tin, hot working the cast copper alloy mass, then cooling, not slowly, the hot worked alloy mass without being subjected to any solid solution treatment, further cold working the cooled alloy mass, and thereafter subjecting the cold worked alloy mass to an aging treatment.
    Type: Grant
    Filed: November 22, 1982
    Date of Patent: March 27, 1984
    Assignees: Sumitomo Metal Mining Company Limited, Nippon Telegraph and Telephone Public Corporation, Nippon Telecommunication Engineering Company Limited
    Inventors: Kishio Arita, Toshio Takahashi, Akio Miyoshi, Hajime Izumimori, Mitsushi Ishida