Who Is Suing For Patent Infringement?

Kyle Jensen and his group at PriorSMart maintain an incredible database of patent litigation. Last week Kyle provided me with some interesting data on patent filings over the past decade for one of my ongoing projects. I thought that I would present a snapshot based on PriorSMart's information. The first table below looks at the top-25 filers of patent infringement lawsuits during the past ten years. The second table looks instead at the count of defendants who have been sued for that same time period. (At this point, the defendant-count has some duplication based on individual lawsuits that name both the parent and subsidiary companies as defendants).