US Patent Issued to SUMITOMO ELECTRIC INDUSTRIES on Nov. 11 for "Production method for optical fiber base material, and optical fiber base material" (Japanese Inventors)

ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,466,757, issued on Nov. 11, was assigned to SUMITOMO ELECTRIC INDUSTRIES LTD. (Osaka, Japan).

"Production method for optical fiber base material, and optical fiber base material" was invented by Hirotaka Sakuma (Osaka, Japan) and Yuki Kawaguchi (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for manufacturing an optical fiber preform made of silica-based glass, the method including: forming a core portion; and forming a cladding portion surrounding the core portion, the cladding portion having a refractive index lower than a refractive index of the core portion, wherein the forming the core portion includes: adding an alkali elemen...