NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Technology Entry in the Presence of Patent Thickets

Bronwyn H. Hall, Christian Helmers, Georg von Graevenitz

NBER Working Paper No. 21455
Issued in August 2015, Revised in January 2017

---- Acknowledgments ----

We are grateful to the Intellectual Property Office of the United Kingdom for research support and to the National Institute of Economic and Social Research for hospitality while this paper was being written. The views expressed here are those of the authors. They are not necessarily those of the UK Intellectual Property Office or NIESR. The revision of this paper has benefitted from comments by participants in seminars at the UKIPO, the USPTO, the NBER Summer Institute, the University of California at Berkeley, TILEC, Tilburg University, the University of Wuppertal and the TIGER Conference in Toulouse. We would like to thank Jonathan Haskel, Scott Stern, Dietmar Harhoff, Stefan Wagner and Megan MacGarvie for comments, and Iain Cockburn, Dietmar Harhoff, and Stefan Wagner for very generous support with additional data. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.

---- Disclosure of Financial Relationships for Georg von Graevenitz ----

Georg von Graevenitz acknowledges further support from the Economic and social Research Council (ESRC) grant to the Centre for Competition Policy at the University of East Anglia.

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