in knowledge spillovers. Drawing on the NBER Patent Citations Database, we examine patent citations data at metropolitan … level within the U.S. and the 38 largest patent-cited countries outside the U.S. We present 3 key findings: First, we find … of cited patent, which implies that new knowledge faces the largest barriers to diffusion. However, over time, border and …

lower than the social planner’s benchmark, which suggests a role for patent policy. We focus on a “non-infringing inventive … instrument in the form of patent length policy. …

patentability standards at PTOs (Patent and Trademark Offices awarding so-called bad patents), not only “false innovators” have the … chance of being granted patents but also, and more interestingly, “true innovators” are forced to patent more intensively … distortions caused by bad patents. Moreover, we show that introducing a two-tiered patent system is unlikely to improve market …

the optimal mix of patent and trade secrets when the innovator faces a strict novelty requirement and can only patent a … innovator can successively patent different fragments of the process. We compare a regime with prior user rights, when the …