PAPER ID: A157 What influences patent citation? An evidence from Korean invented US patents in pharmaceutical field

The modeling and computation of patent citations data provides an exciting opportunity to examine the links among inventions and inventors, over time, space, technology, and institutions. So far, a number of scientometric and econometric models, which deal with number of patents and use count data model, are introduced to analyze the relationship among that number of patents (research output) and other research inputs such as R&D investment. However, models dealing with the relationship among patent citation counts and other patent characteristics are rare. Jaffe and Trajtenberg (2002), in their book of well-selected papers regarding patent citation, addressed a number of issues related to patent citation. They handled and modeled aggregated US patent citation data. Therefore in macro view they could find meaningful trend and policy implication, for example, geographic localization of knowledge spillover and citation trend differences among R&D fields. However, studies addressing more micro and specified issues related to patent citation are needed.