US Patent Issued to SUMITOMO ELECTRIC INDUSTRIES on Dec. 23 for "Seal structure of wire drawing furnace for optical fiber, and production method for optical fiber" (Japanese Inventors)

ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,503,387, issued on Dec. 23, was assigned to SUMITOMO ELECTRIC INDUSTRIES LTD. (Osaka, Japan).

"Seal structure of wire drawing furnace for optical fiber, and production method for optical fiber" was invented by Iwao Okazaki (Osaka, Japan), Satoshi Yoshikawa (Osaka, Japan), Takashi Yamazaki (Osaka, Japan) and Makoto Aoki (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "This seal structure of a wire drawing furnace for an optical fiber is for sealing a gap between an upper end opening of the wire drawing furnace for an optical fiber and a glass base material for an optical fiber inserted from the upper end opening into a furnace core tube. This...