cumulative innovation. Recent evidence suggests that semiconductor firms do not rely heavily on patents, despite the … strengthening of US patent rights in the early 1980s. Yet the propensity of semiconductor firms to patent has risen dramatically … semiconductor firms during 1980-94. The results suggest that stronger patents may have facilitated entry by firms in niche product …

We revisit the effect of the “Eco-Patent Commons” (EcoPC) on the diffusion of patented environmentally friendly … patents covering 94 “green” inventions. Hall and Helmers (2013) suggested that the patents pledged to the commons had the … organizational issues. Our findings have implications for the effectiveness of patent commons in enabling the diffusion of patented …