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They Don'T Invent Them Like They Used To: An Examination Of Energy Patent Citations Over Time

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Author Info
David Popp
Abstract

This article uses patent citation data to study flows of knowledge across time and across institutions in the field of energy research. Popp [2002, Induced Innovation and Energy Prices. American Economic Review, 92 (1), 160--180.] finds that the level of energy-saving research and development (R&D) depends not only on energy prices, but also on the quality of the accumulated knowledge available to inventors. Patent citations are used to represent this quality. This article explores the pattern of citations in these fields more carefully. Evidence for diminishing returns to research inputs, both across time and within a given year is found. To check whether government R&D can help alleviate potential diminishing returns, special attention is paid to citations to government patents. The government patents filed in or after 1981 are more likely to be cited. More importantly, descendants of these government patents are 30% more likely to be cited by subsequent patents. Earlier government research was more applied in nature and is not cited more frequently.

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Publisher Info
Article provided by Taylor and Francis Journals in its journal Economics of Innovation and New Technology.

Volume (Year): 15 (2006)
Issue (Month): 8 (November)
Pages: 753-776
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Handle: RePEc:taf:ecinnt:v:15:y:2006:i:8:p:753-776

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Related research
Keywords: Patents Citations Research and development Energy Diminishing returns

References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:

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  7. Hall, B. & Jaffe, A. & Trajtenberg, M., 2001. "The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools," Papers 2001-29, Tel Aviv.
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  11. Adam B. Jaffe & Richard G. Newell & Robert N. Stavins, 2000. "Technological Change and the Environment," NBER Working Papers 7970, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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  12. Pakes, Ariel S, 1986. "Patents as Options: Some Estimates of the Value of Holding European Patent Stocks," Econometrica, Econometric Society, vol. 54(4), pages 755-84, July. [Downloadable!] (restricted)
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  14. Richard G. Newell & Adam B. Jaffe & Robert N. Stavins, 1999. "The Induced Innovation Hypothesis And Energy-Saving Technological Change," The Quarterly Journal of Economics, MIT Press, vol. 114(3), pages 941-975, August. [Downloadable!] (restricted)
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  15. Jean O. Lanjouw & Ariel Pakes & Jonathan Putnam, 1996. "How to Count Patents and Value Intellectual Property: Uses of Patent Renewal and Application Data," NBER Working Papers 5741, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Pizer, William A. & Popp, David, 2007. "Endogenizing Technological Change: Matching Empirical Evidence to Modeling Needs," Discussion Papers dp-07-11, Resources For the Future. [Downloadable!]
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