Quack medicine After he opened his first shop in 1981, Tien applied for a trademark for the term "ginger duck." When it was determined in 1986 that this was a generic name for a food and thus could not be used as a trademark, Tien formally adopted the name King Duck.
轉骨大補帖民國七十年十月第一家紅面薑母鴨成立，田正德將「薑母鴨」三個字申請為註冊商標，一直到七十五年薑母鴨變成產品說明，他才正式改名「帝王食補薑母鴨」。