ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,234,536, issued on Feb. 25.
"High speed steel composition" was invented by Arthur Craig Reardon (Webster, N.Y.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A high speed steel composition and article are disclosed consisting, in weight percent, essentially of about 0.75% to 1.69% carbon, 0.15% to 0.80% manganese, 0.20% maximum phosphorous, 0.25% maximum sulfur, 0.20% to 0.65% silicon, 3.75% to 4.50% chromium, greater than 10.00% to 20.00% tungsten, greater than 1.25% to 4.21% molybdenum, 4.00% maximum vanadium, 4.00% maximum columbium, 12.00% maximum cobalt, 0.010% to 0.090% nitrogen, 0.75% maximum copper, 0.75% maximum nickel, 0.25% maximum aluminum a...