Patents Assigned to Riken Keikinzoku Kogyo Kabushiki Kaishi
  • Method of manufacturing extruded structural profiles from aluminum based metal scraps
    Patent number: 4028795
    Abstract: Aluminum or aluminum alloy scraps or wastes are broken into chips and converted into a cylindrical body to be extruded under a temperature suitable to produce extruded structural profiles. The method is characterized by the fact that the interior of the extruder is evacuated prior to or simultaneously with the extrusion step so as to exhaust air entrapped in the cylindrical body.
    Type: Grant
    Filed: July 8, 1975
    Date of Patent: June 14, 1977
    Assignee: Riken Keikinzoku Kogyo Kabushiki Kaishi
    Inventors: Toshiro Takahashi, Toshihiro Nagano, Katsuhiko Nakamura, Masaru Kikuchi