and patents. We document key empirical facts on inventors' productivity over the life cycle, inventors' research teams …, and interactions with other inventors. Among others, most patents are the result of collaborative work. Interactions with …An inventor's own knowledge is a key input in the innovation process. This knowledge can be built by interacting with …

knowledge of new inventors effect the performance of regional innovation systems (RIS). The results suggest that the knowledge …The development of inventor networks is characterized by the addition of a significant number of new inventors, while a … considerable number of incumbent inventors discontinue. We estimate the persistence of knowledge in regional inventor networks …