Patents Assigned to Dai Nippon Co., Ltd.
  • Method for coating inner faces of metal pipes of small diameter
    Patent number: 3982050
    Abstract: This invention relates to a method for coating inner faces of metal pipes of a small diameter which comprises feeding a stream of a powdery resin at a rate of 2 to 10 m/sec into a metal pipe of a small diameter preheated at a temperature higher by 20.degree. to 70.degree.C. than the melting or softening point of said powdery resin so that the concentration of said powdery resin or a mixture of said powdery resin and a carrier is 5 to 40% by volume.
    Type: Grant
    Filed: May 16, 1974
    Date of Patent: September 21, 1976
    Assignee: Dai Nippon Co., Ltd.
    Inventors: Haruhiro Kato, Tsunehiko Toyoda, Hiroyuki Tanabe