Patent Law

Over the last two decades, more than 1500 amici, representing thousands of organizations, companies, and individuals, have signed onto amicus briefs in over a hundred patent cases, many of them representing landmark decisions. This paper turns the spotlight on these "behind-the-scenes" actors in the patent system. It combines theoretical insights with an empirical study of amicus briefs filed in patent cases over the last 20 years in an examination of who is interested in the patent system, the positions they have advocated, and the effectiveness of their advocacy. Amicus filers have been instrumental in shaping the courts' agenda; the Supreme Court was seven times more likely to grant cert, and the Federal Circuit eight times likely grant a petition for en banc rehearing, if urged to by an amicus. However, while certain briefs have been important, overall the balance of briefs on the merits have not had a measurable impact on the courts' rulings. One exception has been the briefs of the US Government, which have been exceptionally prescient. Over the 20 years studied, every single amicus brief authored by the US Government in a Supreme Court patent case except one predicted the case outcome. That is to say, in almost all cases, the Court affirmed or rejected the lower court holding when the Government told it to, and in one case, dismissed cert as improvidently granted when the Government recommended doing so. In terms of who files briefs and their agenda, the results are somewhat surprising. Although debates about the patent system are usually cast as a fight between the pharmaceutical and hi-tech industries, patent lawyers comprise a powerful interest group, filing the most briefs of any single group. In addition, among companies, what seems largely to determine how they advocate is their business model – non-practicing entities, for example, nearly always weighed in for the patentee and public companies, often against the patentee. These and other results have implications for those seeking to understand the patent system and those seeking to influence it.