Many commentators and policymakers have recognized that patents on interfaces can be and sometimes have been exercised to block the development of interoperable technologies. Out of concern about the exclusionary power of such patents, they have proposed a wide array of legal and policy measures...

We offer description and analysis of the 2008 Berkeley Patent Survey, summarizing the responses of 1,332 U.S.-based technology startups in the biotechnology, medical device, IT hardware, software, and Internet sectors. We discover that holding patents is more widespread among technology startups...