US Patent Issued to HOYA on Aug. 4 for "Optical glass, optical element blank, and optical element" (Japanese Inventor)

ALEXANDRIA, Va., Aug. 5 -- United States Patent no. 12,699,218, issued on Aug. 4, was assigned to HOYA Corp. (Tokyo).

"Optical glass, optical element blank, and optical element" was invented by Shungo Kuwatani (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical glass which has a refractive index nd of 1.80 to 2.00 and an Abbe number Nud of 17 to 22, contains 25 to 40 mass % of P2O5, 15 to 40 mass % of Nb2O5, 10 to 35 mass % of TiO2, 3 to 12 mass % of B2O3, 0 to 15 mass % of BaO, greater than 0 mass % and 10 mass % or less of Li2O, greater than 0 mass % and 15 mass % or less of a total of Li2O, Na2O, K2O, and Cs2O [Li2O+Na2O+K2O+Cs2O], has a mass ratio [TiO2/(Nb2O5+TiO2+WO3+Bi2O3+Ta2O5)] of TiO2 ...