ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,873, issued on May 27, was assigned to Carl Zeiss Jena GmbH (Jena, Germany).
"Concealed grating structures" was invented by Daniel Thomae (Jena, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A waveguide includes a partially transparent incoupling portion, having a decoupling portion spaced apart therefrom in the lateral direction, having a substantially transparent base body outside the incoupling and outcoupling portions. The transparent base body has front and rear sides, the wave guide having a diffractive incoupling structure in the incoupling portion and a decoupling structure in the decoupling portion, the diffractive incoupling struc...