FOOSUNG CO., LTD.; Cho, ook jae; Ryu, Jae Kug; Kim, Bong Seok; Kim, Donghyun; Park, Byounghun; Park, Su Jin; Jung, Jin-A; Kim, Daewoo Patent: US2014/135538 A1, 2014 ; Location in patent: Paragraph 0110-0111 ;