InterDigital

InterDigital is a company that develops wireless technologies for mobile devices, networks, and services worldwide. Founded in 1972, InterDigital is listed on NASDAQ and is included in the S&P MidCap 400 index.

InterDigital has a portfolio of about 20,000 U.S. and foreign issued patents and patent applications. In 2012 Business Insider put them on their list of the 8 most fearsome patent trolls. They are frequently called patent trolls because they don't build products, but instead license technology and standards-essential patents to product-manufacturing companies.