US Patent 7867109 Golf ball with dimples having constant depth

A golf ball having an improved dimple pattern is disclosed. The dimples may have a regular or irregular polygonal perimeter, an undimpled land surface and a depression therein. The perimeter may alternatively comprise a number of linear sides and at least one curved side. At least a portion of the bottom of the depression is convex such that its curvature is substantially identical to the curvature of the land surface making the depth of that portion constant along its surface relative to the land surface. The depression may further comprise a sub-depression. Alternatively, the depression may further comprise a projection. Additionally, the depression may have a polygonal or circular perimeter.