ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,501,853, issued on Dec. 23, was assigned to Shakespeare Co. LLC (Greer, S.C.).
"Trimmer line for string trimmers" was invented by David B Skinner (Columbia, S.C.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A novel monofilament trimmer line is provided for reducing noise, reducing air drag and increasing durability by having a non-round cross-sectional shape defined as a polygon with three to six sides wherein the vertices between adjacent sides have been replaced with generous circular arcs, the arcs of a parabola, or even other arc shapes so long as the arc is convex and contains no sharp edges and wherein each arc is tangent to the two adjacent sid...