US Patent Issued to Sunever Eyewear on Dec. 30 for "Method of producing gradient photochromic lens and product thereof" (Taiwanese Inventor)

ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,510,772, issued on Dec. 30, was assigned to Sunever Eyewear Co. Ltd. (Tainan, Taiwan).

"Method of producing gradient photochromic lens and product thereof" was invented by Yi Zhuang (Tainan, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of producing a gradient photochromic lens comprises providing a lens and a dyeing trough, with the lens including a front surface and a rear surface; immersing the lens in the dyeing trough to proceed with dyeing, and moving the lens out of the dyeing trough, forming a gradient dyed layer on each of the front surface and the rear surface of the lens after drying and hardening; providing a photochromic op...