relating to patenting, robust conclusions regarding the empirical consequences for technological innovation of changes in …

of patent law on innovation. The data have been constructed from the catalogues of two 19th century world fairs: the …

's fairs between 1851 and 1915. Exhibition data show that the industry where an innovation is made is the single most important …

How do non-practicing entities ("Patent Trolls") impact innovation and technological progress? Although this question …", who exploit the patent system to extract rents and thereby hurt innovation. We employ unprecedented access to NPE … also find that downstream innovation drops in fields where patents have been acquired by NPEs. Finally, our numerical …

We study the causal impact of patent invalidation on subsequent innovation and exit by the patent holder. The analysis …