After thirteen years of long battle, Coca-Cola Company has finally  been granted registration for the trademark “zero’’ for its zero-calorie drinks, namely Coca-Cola Zero, Sprite Zero and Powerade Zero by the US trademark authorities. The company had been trying to register the trademark “zero” in US since 2003. However, Dr Pepper who sells a diet soda, called Diet Rite Pure Zero, challenged this effort by Coca-Cola in the year 2007 for registration of the word “zero”.  Dr.Pepper argued that “zero”…