07.01.21
US Patent No. 11,000,456 B2 (Hyun-Tak Han, Eun-Ji Jang); GDK Cosmetics.Co., Ltd., Incheon, South Korea, patented a method for using a mask sheet that entails removing a portion of a packaging paper from a cosmetic mask kit packed in a biodegradable packaging material; adding an aqueous cosmetic liquid inside the packaging paper of the cosmetic mask kit; mixing the mask sheet, the cosmetic composition in an oil in surfactant emulsion gel, and the added aqueous cosmetic liquid; and taking out the mask sheet from the packaging paper and contacting the mask sheet with the skin.