ALEXANDRIA, Va., July 21 -- United States Patent no. 12,686,940, issued on July 21, was assigned to SHIN-ETSU HANDOTAI Co. LTD. (Tokyo).
"Single crystal pulling apparatus and method for pulling single crystal" was invented by Kiyotaka Takano (Annaka, Japan) and Hiroyuki Kamada (Nishigo-mura, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention is a single crystal pulling apparatus which includes a pulling furnace having a central axis and a magnetic field generating apparatus having coils, and applies a horizontal magnetic field to a molten semiconductor raw material, wherein the coils are saddle-shaped, two pairs of the coils are provided with the coils of each pair arranged facing eac...