ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,416,391, issued on Sept. 16, was assigned to LEDLENSER GMBH & Co. KG (Solingen, Germany).
"Collimator and portable lighting device" was invented by Oliver Dross (Hilden, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A collimator (1) for collimating light uses a plurality of optical surfaces each forming optical boundary surfaces with a change in the optical density. The collimator (1) has a substantially flat light entry surface (2), a convex light exit surface (4) and a totally reflective side wall (3) connecting the light entry surface (2) to the light exit surface (4). A portable lighting device is provided having such a collimator. In orde...