US Patent Issued to SUMITOMO ELECTRIC INDUSTRIES on Aug. 26 for "Method for producing optical fiber base material, and optical fiber base material" (Japanese Inventors)

ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,398,062, issued on Aug. 26, was assigned to SUMITOMO ELECTRIC INDUSTRIES LTD. (Osaka, Japan).

"Method for producing 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 includes: adding an alkali metal element or an alkaline earth metal element to an inner surface of a glass pipe made of silica-based glass; reducing a diameter of the glass pipe after the adding; etching an inner surface of a continuous section of the glass pipe in a longitudinal direction after the red...