Lovely but dangerous The impact of patent citations on patent 可爱而危险的专利引用的专利的影响精品.pdfVIP

Lovely but dangerous: The impact of patent citations on patent duration * By Per Botolf Maurseth Abstract What is the impact of patent citations on patent renewal behaviour? Patent citations are commonly used as an indicator of technology spillovers. For cited patents therefore, patent citations have a potentially ambiguous impact. On the one hand, patent citations may indicate a scientific breakthrough, a high value of the cited patent and therefore a long survival period. On the other hand, patent citations may indicate competing innovations that render the cited patent obsolete. By discriminating patents by technology field, it is demonstrated that patents that receive citations across technology fields survive longer than other patents. Patents that receive citations within the same technology field lapse earlier. JEL Classification Numbers: 030, 034, C41 Keywords: Technology spillovers, Patent data, Patent Renewal Data, Patent Citations. * The Norwegian Institute of International Affairs, P.O.Box 8159, Dep., N-0033 Oslo. Telephone: + 47 22 05 65 45. Email: PerB.Maurseth@nupi.no. This paper has benefited from comments from Tor Jakob Klette, Samuel Kortum, Ådne Cappelen, Jon Dagsvik, Karl Ove Moene, Jan Fagerberg, Mads Greaker and Leo Andreas Grünfeld. I thank Tor Jakob Klette and Bart Verspagen for providing the data used in this paper. 1. Introduction It is widely accepted that spillover effects associated with knowledge production reduce the (private) incentives to invest in research and development, RD.1 The patent institution is the political answer to knowledge spillovers (in addition to RD subsidies of various kinds). Patents e