Even as the specter of bankruptcy protection looms, Eastman Kodak Co. is intensifying its efforts to defend its intellectual property. In a lawsuit it filed in New York on Friday against Fujifilm Corp., Kodak claimed some of its Japanese rival's cameras infringe its digital-imaging technology. At the beginning of the week, Kodak sued Apple Inc. and HTC Corp. claiming some of their smartphones, tablets and other devices infringe Kodak patents related to transmitting images.