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This paper studies the causal impact of patents on subsequent innovation by the patent holder. The analysis is based on court invalidation of patents by the U.S. Court of Appeals for the Federal Circuit, and exploits t...Read more...
27 November 2015
Sharon Belenzon and Mark Schankerman
Using new data on citations to university patents and scientific publications, and measures of distance based on Google maps, we study how geography affects university knowledge diffusion. We show that knowledge flows fr...Read more...
Alberto Galasso and Mark Schankerman
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...Read more...
Michael Noel and Mark Schankerman
Strategic patenting is widely believed to raise the costs of innovating, especially in industries characterised by cumulative innovation. This paper studies the effects of strategic patenting on R&D, patenting and market...Read more...
Nick Bloom, Mark Schankerman and John Van Reenen
Support for many R&D and technology policies relies on empirical evidence that R&D “spills over” between firms. But there are two countervailing R&D spillovers: positive effects from technology spillovers and negative ef...Read more...
Sudipto Bhattacharya and Sergei Guriev
We develop a model of two-stage cumulative research and development (R&D), in which one Research Unit (RU) with an innovative idea bargains to license her nonverifiable interim knowledge exclusively to one of two competi...Read more...
Jean Olson Lanjouw and Mark Schankerman
We analyse the determinants of the decline in measured research productivity (the patent/R&D ratio)using panel data on manufacturing firms in the U.S. for the period 1980-93. We focus on three factors: the level of deman...Read more...
This paper investigates the characteristics of litigated patents by combining for the first time information about patent case filings from the U.S. district courts and detailed data from the U.S. Patents and Trademark O...Read more...
Francesca Cornelli and Mark Schankerman
When firms have different R&D productivities, it may be welfare increasing to differentiate patent lives across inventions. The reason is that the uniform patent life provides excessive incentives to do R&D to the low pr...Read more...
Jean Olson Lanjouw
This paper investigates the effect of the threat and occurrence of patent litigation on the private value of patent protection. Potential challenges are introduced into a renewal model as a factor in patentee decisions a...Read more...