ALEXANDRIA, Va., April 7 -- United States Patent no. 12,595,180, issued on April 7, was assigned to Covia Holdings LLC (Independence, Ohio).
"Ultra-white silica-based filler" was invented by Gregory Kenneth Bedford (Spring, Texas) and Claud Eric Westbrook III (Conroe, Texas).
According to the abstract* released by the U.S. Patent & Trademark Office: "An ultra-white granular silica-based filler comprises at least 99.5 wt. % silica, wherein the crystal structure of the silica is such that the silica-based filler comprises 40 to 80 wt. % cristobalite, 1 to 25 wt. % tridymite, 2-60 wt. % quartz and greater than5 wt. % amorphous silica, wherein the temperature of the ultra-white granular silica-based filler is no higher than 50deg C. and furth...