We study the causal impact of invalidating marginally valid patents during post-grant opposition at the European Patent Office on affected inventors' subsequent patenting. We exploit exogenous variation in invalidation by leveraging the participation of a patent's original examiner in the...

China has surpassed the United States in patent applications and has become world leader. Strong patenting activity, however, did not lead to strong productivity growth. The delinking of patenting activity from productivity growth could be explained by quality and relevance issues. Although the...