Patents Assigned to Dow Industries
  • Patent number: 4571449
    Abstract: A shielded door assembly for a generally rectangular opening in the electrically conductive wall of a grounded building has an electrically conductive frame secured to the wall along three of the sides of the opening. A tubular frame is secured to the first frame along the three sides thereof. An electrically conductive threshold having a non-interrupted contact surface is secured to the tubular frame at the remaining side of the opening. An electrically conductive door stop is secured to a first edge of said tubular frame and extends outwardly therefrom and cooperates with the tubular frame and the first frame for defining a pocket. An electrically conductive tubular door rim is pivotally secured to said first frame and is adapted for pivoting between an open and a closed position.
    Type: Grant
    Filed: August 16, 1984
    Date of Patent: February 18, 1986
    Assignee: Dow Industries
    Inventors: James N. Lindenberger, Bert M. Christie, Roy V. Johnson