ALEXANDRIA, Va., March 12 -- United States Patent no. 12,247,035, issued on March 11, was assigned to Transitions Optical Ltd. (Tuam, Ireland).
"Articles comprising indolenaphthopyrans" was invented by Ryan Stayshich (Pittsburgh), Zachary Smith (Pittsburgh) and Robert W. Walters (Murrysville, Pa.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is an article which transitions from a first state to a second state in response to actinic radiation. The article includes an indolenaphthopyran, wherein in the first state the article exhibits a percent transmission of greater than 80 percent, and in the second state the article exhibits a percent transmission of between 35 and 75 percent, and a TauSB value o...