Patent ID: 8231304

Claim:
An artificial stone for covering a supporting surface, comprising a base portion for placement on the supporting surface, a top portion and an intermediate portion connecting the top and base portions, the base portion being shaped for patterned, fitting arrangement of the stone with like stones to produce a covering of stones on the supporting surface in a regular pattern, the base portion having a flat polygonal base with a regular base contour and upstanding right angle base walls, each with parallel side edges, a straight bottom edge at the base contour and an irregular top edge adjacent the intermediate portion; the top portion having a facing surface and depending top walls, the facing surface having an irregularly shaped top contour, and the depending top walls having irregularly shaped top and bottom edges of differing shape; and the intermediate portion having an inclined wall extending between the top portion and the base portion and the inclined wall including multiple planar wall sections having straight side edges, each planar wall section connected to the bottom edge of at least one of the top walls and the top edge of at least one of the base walls, for generating visible joints of irregular width and outline between adjacent like stones in an installed condition.