ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,479,999, issued on Nov. 25, was assigned to ECKART GmbH (Hartenstein, Germany).
"Weather stable pearlescent pigments" was invented by Michael Gruner (Auerbach, Germany), Gunter Kaupp (Neuhaus/Pegnitz, Germany) and Thomas Schneider (Lauf, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "Weather stable pearlescent pigment having a basic pearlescent with an interference color which comprises a transparent platelet-shaped substrate and at least one metal oxide layer with a refractive index less than1.8 and on top of this basic pearlescent pigment a weather stabilizing top coating comprising at least one metal oxide and an organofunctional surface modi...