J. Ray McDermott, S.A. (J. Ray), a subsidiary of US engineering firm McDermott International, Inc, and Keppel FELS Ltd (Keppel), a wholly-owned subsidiary of Singapore’s Keppel Offshore & Marine, said that ABB Lummus Global Inc. (ABB) has accepted in principle their joint offer to purchase ABB’s Floating Production Systems US and foreign patents.   This…