Leaper Footware, owners of a 1998 patent covering “Performance measuring footwear”, has filed a lawsuit naming both Apple and Nike, claiming the companies’ Nike+iPod Sport Kit infringes on Leaper’s patent. In the complaint, Leaper claims that it contacted Nike in 2000, sending the footwear giant a copy of the patent and encouraging it to license and incorporate the technology into its running shoes; Nike reportedly responded…