ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,460,279, issued on Nov. 4.
"Cosmetic zinc alloy massage head formula and preparation technology thereof" was invented by Guoxiang Cai (Guangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention discloses a cosmetic zinc alloy massage head formula and a preparation technology thereof. The formula comprises the following raw materials: 4.19% of aluminum, 0.0027% of lead, 0.0005% of cadmium, 0.0011% of copper, 0.0073% of iron, 0.044% of magnesium, smaller than 0.0005% of tin, smaller than 0.001% of nitrogen, and zinc for the residual. A zinc alloy massage head has high impact strength and good tear resistance, and the technology can effec...