The first device he produced, called a "double brush" was designed to help housewives clean toilet fittings by placing the brush, soap and spray nozzle together.
劉興欽的「鴛鴦刷」終於讓他取得平生第一項發明專利。「雙頭夾」、「通風胸罩」也陸續地得到專利權。