Nalco en Oil dispersant maker asks judge to toss claims <p style="color: rgb(51, 51, 51); font-family: Verdana, Helvetica, Arial, sans-serif, Geneva; font-size: 11px; line-height: 15px; ">The manufacturer of a chemical dispersant used to fight the 2010 BP oil spill in the Gulf of Mexico has asked a federal judge to dismiss claims over the government&#39;s use of its product.</p> Fri, 13 Jul 2012 19:11:01 +0000 MICHAEL KUNZELMAN | The Associated Press 15710 at