US Patent Issued to SUMCO on Nov. 3 for "Manufacturing method of quartz glass crucible" (Japanese Inventors)

ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,781,380, issued on Nov. 3, was assigned to SUMCO Corp. (Tokyo).

"Manufacturing method of quartz glass crucible" was invented by Masami Ohara (Akita, Japan), Hiroshi Kishi (Akita, Japan) and Eriko Kitahara (Akita, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A manufacturing method of a quartz glass crucible includes: producing a quartz glass crucible by arc-melting raw material quartz powder deposited on an inner surface of a rotating mold; washing an inner surface of the quartz glass crucible with pure water thereby reducing a total concentration of Na, K, and Ca contained in a silica glass around the inner surface as compared to that before wash...