ALEXANDRIA, Va., March 19 -- United States Patent no. 12,251,791, issued on March 18, was assigned to FUJI KIHAN Co. LTD. (Nagoya, Japan).
"Metal product surface member and method for burnishing same" was invented by Yoshio Miyasaka (Nagoya, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention improves surface roughness by knocking down protruding parts while leaving recessed parts in the surface of a metal product, protrusions/recesses having been formed in said surface via blasting, and improves surface hardness and compressive residual stress. Treatment is performed upon a metal product in which protrusions/recesses have been formed in the surface thereof via blasting. Spherical shot...