Acacia Research Corporation through its operating subsidiaries, acquires, develops, licenses and enforces patented technologies. The Company�s operating subsidiaries generate revenues and related cash flows from the granting of rights for the use of patented technologies, which its operating subsidiaries own or control. Its operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, if necessary, with the enforcement against unauthorized users of their patented technologies. In August 2013, Acacia Research Corporation announced that a subsidiary acquired a patent portfolio relating to semiconductor testing technology. In November 2013, the Company�s subsidiary acquired the United States patents and foreign counterparts related to cellular HSPA and LTE technology.