ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,156, issued on Sept. 23, was assigned to Shin-Etsu Chemical Co. Ltd. (Tokyo).
"Method for manufacturing optical fiber glass preform" was invented by Hiroki Kojima (Chiba, Japan) and Dai Inoue (Ibaraki, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a method for manufacturing an optical fiber glass preform in which a refractive index distribution is stable in a longitudinal direction of the glass preform. A method for manufacturing an optical fiber glass preform includes: depositing a porous glass preform by a vapor phase method; and sintering the porous glass preform in a heating region, when sintering the porous glass preform, th...