Patents Assigned to Kyoritsu Seiki Co., Ltd.
  • Ball stud
    Patent number: 7585572
    Abstract: A ball stud having a ball at one end of a rod-shaped stud. The ball stud comprises: a metal plating film formed on the surface of the stud; and a trivalent chromate film continuously formed over both the surface of the metal plating film formed on the stud and the surface of the ball, whereby rust is inhibited in the boundary of the metal plating film. An externally threaded portion is also coated, if formed in the ball stud, on its surface with the metal plating film and the trivalent chromate film.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: September 8, 2009
    Assignee: Kyoritsu Seiki Co., Ltd.
    Inventor: Hirotaka Hattori