U.S. trademark authorities have ruled that Atlanta-based the Coca-Cola Co. (NYSE: KO) does not have exclusive rights to use the work “zero” on products, but the company did get some good news. The Trademark Trial and Appeal Board agreed to register the word “zero” for the beverage giant’s diet-soda and sports-drink brands, reports The Wall Street Journal. The rulings are part of a nearly decade-long dispute between Coca-Cola and rival Dr.