US Patent Issued to AGC on Oct. 21 for "Alkali-free glass" (Japanese Inventors)

ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,448,319, issued on Oct. 21, was assigned to AGC Inc. (Tokyo).

"Alkali-free glass" was invented by Hirofumi Tokunaga (Tokyo) and Kazutaka Ono (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An alkali-free glass includes, in mol % in terms of oxides: SiO2: 63-69%; Al2O3: 8-13%; B2O3: 0.5-4%; MgO: 8-15%; CaO: 4-12%; SrO: 0-4.5%; and BaO: 0-1%. [MgO]/[CaO] is 0.67 to 3.75. A value of Formula (A) is 84 or larger. A value of Formula (B) is 715 or smaller. A value of Formula (C) is 200 or smaller. A value of Formula (D) is 15 or smaller."

The patent was filed on Aug. 6, 2021, under Application No. 17/396,217.

*For further information, including images,...