Patent clearinghouse RPX Corporation has agreed to buy e-discovery services provider Inventus for $232 million in cash, the companies announced Dec. 15. The transaction, which is expected to close in mid-to-late January 2016, is expected to add $50 to $60 million to RPX's 2016 revenue.

John Amster, CEO of RPX Corporation, said the acquisition is a “natural extension” of RPX's expertise in mitigating patent risk and lowering legal costs for its clients.

In October, RPX projected 2015 revenue of $286.5 million to $287.1 million.