ALEXANDRIA, Va., March 26 -- United States Patent no. 12,257,640, issued on March 25, was assigned to Black & Decker Inc. (New Britain, Conn.).
"Recip blade" was invented by Matthew C. Green (Amherst, Mass.), Stephen A. Hampton (East Longmeadow, Mass.) and William B. Korb (Broad Brook, Conn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A recip blade has a cutting edge defining a cutting direction and a repeating pattern of cutting teeth. Each repeating pattern includes (i) a leading tooth with respect to the cutting direction that includes a rake face defining a first rake angle that is negative, and (ii) a trailing tooth following the leading tooth with respect to the cutting direction that includes a rak...