ALEXANDRIA, Va., April 21 -- United States Patent no. 12,605,804, issued on April 21, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).
"Abrasive article" was invented by Marijke van der Meer (Welliehausen, Germany) and Jean-Luc Rifaut (Brussels).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to an abrasive article 1 for abrading at least one workpiece, the abrasive article with: a carrier body 2, at least one abrasive layer 3 with a main surface and a predefined thickness, the at least one abrasive layer being arranged on the carrier body, at least two visual indicators 6 with a cross-section in the main surface of the abrasive layer, wherein the size, shape and/or locatio...