Alcácer, Juan; Gittelman, Michelle; Sampat, Bhaven - In: Research Policy 38 (2009) 2, pp. 415-427
Prior art patent citations have become a popular measure of patent quality and knowledge flow between firms. Interpreting these measurements is complicated, in some cases, because prior art citations are added by patent examiners as well as by patent applicants. The U.S. Patent and Trademark...