Patent ID: 7793598

Claim:
A plastic panel comprising first and second joinable portions, said portions each comprising: a support backing including an outer surface and an inner face; and a plurality of ribs extending outwardly away from said inner face, wherein the ribs of a first grouping thereof are disposed to extend across a first area of the face in a first direction in general parallelism relative to one another, and wherein the ribs of a second grouping thereof are disposed to extend across a second area of the face in a second direction which is not parallel with said first direction, said portions being configured, disposed and arranged so as to join with one another in generally overlapping and mated relationship with said outer surfaces disposed in spaced apart opposing relationship, with the first grouping of ribs of the first portion disposed in intermeshing and mating relationship with the first grouping of ribs of the second portion, and with the second grouping of ribs of the first portion disposed in intermeshing and mating relationship with the second grouping of ribs of the second portion whereby to present said plastic panel, wherein each of said portions includes a peripheral wall which extends around the ribs, and wherein said walls have shoulders which are disposed in abutting relationship when the potions are joined together.