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This paper looks at firm-level differences in R&D intensity and sales from product innovations. R&D intensity and innovative sales are explained by a model using harmonised firm-level data from the Third Community Innovation Survey for three European countries: Belgium, Germany and Spain. For each country, the average estimates suggest that incoming knowledge spillovers, research cooperation, appropriability and human capital all exercise a positive influence on R&D intensity and, through this, on innovative sales. Quantile regressions indicate that, although there are differences between countries, the joint relative impact of incoming knowledge spillovers and research cooperation tends to increase quantile-wise in relation to that of appropriability. This suggests that strong innovators have a more open innovation process. [ABSTRACT FROM AUTHOR]