The increase of university patents has raised issues of potential conflicts of interest in Faculty activities. Nonetheless, recent empirical evidence has indicated that very productive scientists contribute disproportionally to academic patenting and that inventing is likely to encourage an increase in scientific productivity. This article adds to this evidence by showing that such beneficial effects are not likely to be earned equally by every scientist. The analysis was run in a large sample of Italian scientists contributing to Materials Sciences in either Chemistry or Engineering of Materials, and makes use of several econometric techniques which are suitable to treating unobserved heterogeneity, excess zeros and incidental truncation. ...