An interesting source of transaction data for valuing patents is Ocean Tomo, an investment bank that holds private and public auctions of patents. The next auction will include 1,100 patents from a global technology company that represent the following technology areas: printing, computing, imaging, network services, personal communication systems, life science and microfluid, photovoltaic, mobile, tablet, telecommunications, projectors, sensors, RFID, and gaming. The patents will be grouped into 45 lots. For further information on these assets for sale and to request bidding information, please contact www.auctions@oceantomo.com.
Traditional sources of data include IP databases such as ktMINE, Royalty Source, and Consor. Also keep an eye on SEC filings and court cases.