ALEXANDRIA, Va., March 5 -- United States Patent no. 12,242,090, issued on March 4, was assigned to Transitions Optical Ltd. (Tuam, Ireland).
"Multi-stage optical article" was invented by Sandrine Guillermin (Tuam, Ireland) and Anil Kumar (Murrysville, Pa.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to optical articles that exhibit a uniform first transmittance when directly exposed to actinic radiation, such as sunlight; a gradient second percent transmittance when exposed to actinic radiation that has passed through an actinic radiation blocking or attenuating transparency (such as a vehicle windshield) interposed between the source of actinic radiation and the optical arti...