使用在先原则是美国商标法律制度的基本原则；在美国，商标权归属于该商标的在先使用人。美国商标法（兰哈姆法）第二条规定：“凡能使申请人的商品区别于他人的商品的商标，不应因其性质而驳回该商标在主注册簿上的注册。除」卜该商标——……（d）包含与已在专利商标局注册的 The principle of prior use is the basic principle of the legal system of the U.S. trademark; in the United States, trademark rights are the previous users of the trademark. Article 2 of the United States Trademark Law (Lanham Act) stipulates: "Trademarks that differentiate an applicant’s goods from others’ goods should not be dismissed by the nature of their registration in the main register. The trademark - ... (d) contains and is registered with the Patent and Trademark Office