RPX took notice, among the USPTO assignment records made available during the latter half of April, of the transfer of patents to a number of frequent plaintiffs in patent litigation, including BlackBird Tech LLC; Intellectual Ventures LLC; IP Valuation Partners LLC; Unwired Planet International Limited, and Wi-LAN Inc. Assignors included Cypress Semiconductor, NXP Semiconductors, Panasonic, ROY-G-BIV, Samsung, and Sharp.