Esko Nissinen: Mat and units thereof. Steinberg and Blake, September 11, 1979: US04167599 (78 worldwide citation)

A mat, such as a bath mat, is made up of a plurality of units which are releasably joined to each other to form a continuous mat structure. Each of these units has a continuous peripheral flange provided with upper and lower edges and an open network of intersecting ribs surrounded by and integral w ...