NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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The Consequences of Invention Secrecy: Evidence from the USPTO Patent Secrecy Program in World War II

Daniel P. Gross

NBER Working Paper No. 25545
Issued in February 2019, Revised in May 2019

---- Acknowledgments ----

I thank Ashish Arora, Pierre Azoulay, Wes Cohen, Shane Greenstein, Deepak Hegde, Jeff Kuhn, Hong Luo, Fabian Waldinger, and Martin Watzinger, audiences at Duke Fuqua, ETH Zurich, Florida State University, Harvard Business School, NYU Stern, University of Luxembourg, the NBER Productivity Lunch, and the LSE Conference on the Economics of Innovation, and three anonymous referees for helpful comments. I am grateful to Alessandro Iaria, Carlo Schwarz, and Fabian Waldinger for sharing code from Iaria et al. (2018), and to Jeff Kuhn for discussing the mechanics of semantic analysis. I also thank Hayley Pallan, Greg Saldutte, and Senan Hogan-Hennessy for outstanding research assistance, and the Harvard Business School Division of Research and Faculty Development and NBER Innovation Policy grant (2016) for financial support. All errors are my own. The views expressed herein are those of the author and do not necessarily reflect the views of the National Bureau of Economic Research.

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