ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,478,460, issued on Nov. 25.
"Electric toothbrush head and manufacturing method thereof" was invented by Qiang Ruan (Guangdong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electric toothbrush head includes a connecting cavity, a connecting part, bristles, and a main body of toothbrush head. The connecting cavity is positioned in an inner cavity, and the connecting cavity is integrally formed by injection molding. A first insertion channel is surrounded and formed by a side wall of the connecting cavity. The first insertion channel is used for insertion of a drive shaft of an electric toothbrush. The main body of toothbrush head is connected t...