Integrated Surgical Systems, Inc. was formed to esign, manufacture, sell and service image-directed, computer-controlled robotic software and hardware products for use in orthopedic surgical procedures. As of December 31, 2011, the Company�s operations are limited to raising additional funds to be used to maintain the Company�s public company status and to complete a business combination if suitable candidate are identified. On April 20, 2011, the Company purchased 363,636 shares of common stock of ClearSign Combustion Corporation (ClearSign). ClearSign is an early-stage clean energy company focused on developing technology to increase energy efficiency in most types of industrial combustion systems.