This might be a naive question, but why has there been no strong push to reform patent law in a way that eliminates non-practicing entities? It seems like it would be wise to have a law that a patent expires if the company who holds it goes a certain length of time (2 years, perhaps) without producing a product covered by the patent or transferring it to a company who does.<p>Would such a law increase innovation (companies are more willing to build products without fear of being sued by patent trolls) or decrease it (patents being less valuable might decrease R+D investment)? My hunch is that it would increase innovation, but I&#x27;m not completely sure.