US Patent Issued to SUMCO on Dec. 30 for "Quartz glass crucible, manufacturing method therefor, and method for manufacturing silicon single crystal" (Japanese Inventors)

ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,793, issued on Dec. 30, was assigned to SUMCO Corp. (Tokyo).

"Quartz glass crucible, manufacturing method therefor, and method for manufacturing silicon single crystal" was invented by Eriko Kitahara (Akita, Japan), Hiroshi Kishi (Akita, Japan) and Hideki Fujiwara (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A quartz glass crucible has, from an inner surface side toward an outer surface side of the crucible, an inner transparent layer, a bubble layer, an outer transparent layer, and a crystallization accelerator-containing layer. An outer transition layer where a bubble content decreases from the bubble layer toward the outer transparent la...