Patents Assigned to Sonoda Factory Co., Ltd.
  • Stair tread
    Patent number: 5357724
    Abstract: A stair tread, in which synthetic rubber is used to encase metal side core portions arranged at the side edges of a substantially horizontal core section at a downward right-angle thereto. A lip is provided along the side edges of the tread surface. The lip projects upward, the outside surface of the lip is flush with the surface of the synthetic rubber that covers the side core sections, and the lip is formed in one piece, of synthetic rubber.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: October 25, 1994
    Assignee: Sonoda Factory Co., Ltd.
    Inventor: Munekatsu Sonoda