Pérez-Luño, Ana; Valle-Cabrera, Ramón - Departamento de Dirección de Empresas, Universidad … - 2010
, while observable knowledge has a negative impact on patents. Furthermore, we find that the effect of R&D expenditure on the … whether R&D expenditure and the type of knowledge used in the invention determine the decision to patent. With this aim, we … use a sample of firms and the European Patent Office to analyse how the combination of R&D expenditure and knowledge …