We investigate the causal effect of patent rights on cumulative innovation, using large-scale data that approximate the …

We study the blocking effect of patents on follow-on innovation by others. We posit that follow-on innovation requires … freedom to operate (FTO), which firms typically obtain through a license from the patentee holding the original innovation …. Where licensing fails, follow-on innovation is blocked unless firms gain FTO through patent invalidation. Using large …

We study the causal impact of patent invalidation on subsequent innovation and exit by the patent holder. The analysis …

Cumulative innovation is central to economic growth. Do patent rights facilitate or impede follow-on innovation? We …. Patent rights block downstream innovation in computers, electronics and medical instruments, but not in drugs, chemicals or … triggers more follow-on innovation by small firms …