ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,735,600, issued on Sept. 15, was assigned to Illinois Tool Works Inc. (Glenview, Ill.).
"Filler composition indicating readiness to sand" was invented by Helena Twardowska (Glenview, Ill.) and Andrew Schirmer (Glenview, Ill.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A vehicle bond filler formulation is provided that includes a part A having curable resin and a monomer reactive diluent. A part B storage-separate, cure initiator package contains a free-radical cure initiator. At least one color changing dye adapted to change color upon mixing the part A and the part B and within plus-minus5 minutes of cure of the curable resin to a sandable conditio...