US Patent 10004294 Slip resistant soles and footwear

A shoe including a slip resistant sole having a bottom face, wherein the sole includes a plurality of arcuate-shaped lugs having non-linear edges, each lug including an inner arc and an outer arc, wherein the outer arc is a convex side and the inner arc is a concave side shorter than the convex side, and each lug includes a groove transecting the lug, wherein the lugs are arranged into a pinwheel pattern group that includes three of the lugs, wherein the bottom face of the sole includes a plurality of the pinwheel pattern groups, and wherein each of the pinwheel pattern groups is radially symmetrical and bilaterally asymmetrical.