Harhoff, Dietmar; Hoisl, Karin; Reichl, Bettina; Van … - 2007
One feature of the European patent system that is heavily criticized nowadays is related to its complex fragmentation … and the induced cost burden for applicants. Once a patent is granted by the EPO, the assignee must validate (and often … validation behavior of applicants. We rely on a gravity model that aims at explaining patent flows between inventor and target …