 A trademark dispute involving the owners of the identically named Burger King in Mattoon, Illinois led to a federal lawsuit; the case's outcome helped define the scope of the Lanham act and trademark law in the United States. An existing trademark held by a shop of the same name in South Australia forced the company to change its name in Australia, while another state trademark in Texas forced the company to abandon its signature product, the Whopper, in several counties around San Antonio. Legal decisions from other suits have set contractual law precedents in regards to long-arm statutes, the limitations of franchise agreements, and ethical business practices; many of these decisions have helped define general business dealings that continue to shape the entire marketplace.
