The group, Partnership for American Innovation (PAI), is concerned that pending legislation will go to far in attacking trolls - businesses which do nothing but buy patents and then sue for infringement. David Kappos, former director of the US Patent and Trademark Office, is advising PAI. He said: ‘There's a feeling that the negative rhetoric is leading to a very anti-patent environment.’ Google and Cisco have been among the companies urging a clampdown on trolls. Source: Reuters