Actors and sectors in technological innovation systems: patterns of knowledge development in the field of second generation biorefineries

This paper investigates the relationships between a focal technological innovation system (TIS), its surrounding sectors, and other TISs, through a value chain perspective. We examine how firm actors from sectors with different value chain positioning contribute to the function of the knowledge development in an emerging TIS. By assigning patents to value chain steps in the context of second generation biorefinery technologies, our findings indicate that sectors differ in their knowledge generation patterns in the focal TIS, and that multiple sectors can contribute to knowledge development along the whole TIS value chain. We also differentiate four types of TIS actors based on the way they develop new knowledge to approach the focal TIS: (1) actors from existing sectors that directly enter the focal TIS; (2) diversifying actors that enter the focal TIS but also its adjacent TISs; (3) actors dedicated to the innovation niche; and (4) actors that emerge and operate solely in the focal TIS.