US Patent Issued to Sumita Optical Glass on Feb. 24 for "Optical glass, preform for precision press molding, and optical element" (Japanese Inventor)

ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,559,413, issued on Feb. 24, was assigned to Sumita Optical Glass Inc. (Saitama, Japan).

"Optical glass, preform for precision press molding, and optical element" was invented by Tatsuya Tezuka (Saitama, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is an optical glass having a composition including, by mol %: 0% to 15 % B2O3; 25% to 40% P2O5, the total content of B2O3 and P2O5 being 35% to 45%; 0% to 10% Al2O3; 5% to 15% Li2O; 0% to 15% Na2O; 0% to 5% K2O; 0% to 35% MgO; 0% to 35% CaO, the total content of MgO and CaO being 20% or more; 0% to 5 % ZnO; 0% to 3% ZrO2; 0% to 3% Y2O3; 0% to 3% La2O3; and 0% to 3% Gd2O3. The composition does ...