Patent infringement litigation has not only increased dramatically in frequency over the past few decades, but also has also seen striking growth in both stakes and cost. Although a relatively rich literature has added much to our understanding of the nature, causes, and consequences of patent...

Sixteen years ago, two of us published the first detailed empirical look at patent litigation. In this Article, we update and expand the earlier study with a new hand-coded data set. We evaluate all substantive decisions rendered by any court in every patent case filed in 2008 and 2009 —...

Repeat patent plaintiffs - those who sue eight or more times on the same patents - have a disproportionate effect on the patent system. They are responsible for a sizeable fraction of all patent lawsuits. Their patents should be among the strongest, according to all economic measures of patent...