ALEXANDRIA, Va., June 25 -- United States Patent no. 12,340,919, issued on June 24, was assigned to SHOEI CHEMICAL INC. (Tokyo).
"Silver paste" was invented by Kousuke Nishimura (Tosu, Japan), Naoto Shindo (Tosu, Japan) and Hiroshi Mashima (Tosu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a silver paste containing at least a silver powder, a binder resin, and an organic solvent, in which a value CBND/SBET is 2.0 to 3.4 where SBET (m2/g) represents a specific surface area of the silver powder, and CBND (% by mass) represents a content percentage of the binder resin based on the silver powder, a copper content of the silver powder is 10 to 5000 ppm by mass, and the silv...