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 …-derived patent and financial data, as well as a novel model that guides our data analysis. We find that NPEs acquire patents from …

One source of uncertainty in the patent system relates to the difficulty in identifying products that are protected … with a patent. This paper studies the adoption by U.S. patentees of "virtual patent marking," namely the online provision … patent marking and empirically examines factors that affect adoption. Data suggest that about 12 percent of patent holders …

the mechanism is secured creditors exercising their control rights on collateralized patents. Creditor-driven patent sales … are more likely to be purchased by patent trolls …

's innovation surveys, and firms' patent, industrial design, and trademark filings with the Chilean IP office. We use these data to …

to gauge how efficiency in the patent market affects growth …

I use U.S. patent data from 1970 to 1994 to estimate the effect of energy prices on energy-efficient innovations. Using … patent citations to construct a measure of the usefulness of the existing base of scientific knowledge, I consider the effect …