WALTHAM, Mass.--(BUSINESS WIRE)--Thermo Fisher Scientific Inc. (NYSE: TMO), the world leader in serving science, today announced that its previously announced tender offer to acquire all of the outstanding shares of Dionex Corporation (NASDAQ: DNEX) for $118.50 per share in cash has been extended and will now expire at 7:00 p.m., New York City time, on May 13, 2011, unless further extended. All other terms and conditions of the offer remain unchanged. The transaction is subject to the satisfaction of customary closing conditions, including applicable regulatory approvals.