ALEXANDRIA, Va., July 9 -- United States Patent no. 12,351,502, issued on July 8, was assigned to Sumita Optical Glass Inc. (Saitama, Japan).
"Optical glass and optical element" was invented by Koichi Tsuchiya (Saitama, Japan) and Hideaki Takaku (Saitama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical glass is provided which does not contain components negatively affecting the environment as environmental loads, and is less colored while having a refractive index maintained moderately high. The optical glass has a composition including, in % by mass, 30% or more and 47% or less of SiO2, 0% or more and 10% or less of B2O3, 3% or more and 12% or less of Na2O, 0% or more and 5% or less of Li2O,...