Patent ID: 6578334
Filing Date: 2003-06-17
Classification: B28B,B44C,E04F

Abstract:
A building board comprising:a front surface having a protruding and recessed pattern; and opposite ends having at least one overlying rabbeted portion and at least one underlying rabbeted portion for respectively overlapping and fitting under corresponding underlying and overlying rabbeted portions; wherein at least one overlying rabbeted portion is formed by one end portion of a protruding portion of said pattern; each underlying rabbeted portion is constructed to have an area bigger than an area of a corresponding overlying rabbeted portion formed by said protruding portion of said pattern on the opposite end; and each of said opposite ends is provided with a linear end contact surface adjacent to a rear surface of said building board for matching with a corresponding end contact surface on an end of another building board, sad end contact surfaces having a constant height.