A group of technology and retail groups is beginning a national ad campaign targeting so-called patent trolls. The Internet Association, National Restaurant Association, National Retail Federation and Food Marketing Institute hide caption

itoggle caption The Internet Association, National Restaurant Association, National Retail Federation and Food Marketing Institute

Vernon Hugh Bowman, who took his case to the Supreme Court, lives outside the small town of Sandborn, Ind. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR