ALEXANDRIA, Va., May 26 -- United States Patent no. 12,636,737, issued on May 26, was assigned to SENJU METAL INDUSTRY Co. LTD. (Tokyo).
"Flux-coated ball and method for manufacturing same" was invented by Ayaka Shirakawa (Tokyo), Hiroyuki Iwamoto (Tokyo), Shigeki Kondo (Tokyo) and Katsuji Nakamura (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention employs a flux-coated ball 100 having a core part 110 and a shell part 120 with which the core part 110 is coated. The flux-coated ball 100 is characterized in that the core part 110 is made of a solder ball or a copper core ball, that the shell part 120 is made of a flux layer containing at least one selected from the group consisting of ...