We formally analyze the effects of legal presumptions in patent litigation. We set up a novel contest model to study litigation outcomes, judgement errors, and resource dissipation under three alternative presumption criteria: a presumption that the patent is valid; a presumption that the patent...

In the past, non-practicing entities (NPEs) - firms that license patents without producing goods - have facilitated technology markets and increased rents for small inventors. Is this also true for today's NPEs? Or are they “patent trolls” who opportunistically litigate over software patents...

We study how fragmentation of patent rights ('patent thickets') and the formation of the Court of Appeal for the Federal Circuit (CAFC) affected the duration of patent disputes, and thus the speed of technology diffusion through licensing. We develop a model of patent litigation which predicts...

The Italian and European regulatory framework for patents would benefit from further improvements in order to foster dynamic competition between Italian firms. At the national level the exclusive allocation of the right to patent inventions to universities, rather than to researchers, would...

The paradigmatic defendant in a patent lawsuit is a vertically integrated manufacturer. But much economic activity is conducted collaboratively by a supply chain of vertically disintegrated firms, and sometimes multiple firms are implicated in infringing activities, by making, selling, or using...

The progression toward reevaluating patent validity in the administrative, rather than judicial, setting became overtly substitutionary in the America Invents Act. No longer content to encourage court litigants to rely on Patent Office expertise for faster, cheaper, and more accurate validity...

The twenty-first century “patent litigation explosion” is not unprecedented. In fact, the nineteenth century saw an even bigger surge of patent cases. During that era, the most prolific patent enforcers brought hundreds or even thousands of suits, dwarfing the efforts of today's leading...

We show that examiner-driven variation in patent rights leads to quantitatively large impacts on several patent outcomes, including patent value, citations, and litigation. Notably, Patent Assertion Entities (PAEs) overwhelmingly purchase patents granted by "lenient" examiners. These examiners...

This paper investigates the entry decision of a firm into a market that is protected by a patent. It shows how entrants use the possibility to study existing prior art before taking their entry decision. Studying prior art reduces the information asymmetry that arises due to the fact that patent...