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Lens or Prism? Patent Citations as a Measure of Knowledge Flows from Public Research

  • Michael Roach
  • Wesley M. Cohen
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    This paper assesses the validity and accuracy of firms' backward patent citations as a measure of knowledge flows from public research by employing a newly constructed dataset that matches patents to survey data at the level of the R&D lab. Using survey-based measures of the dimensions of knowledge flows, we identify sources of systematic measurement error associated with backward citations to both patent and nonpatent references. We find that patent citations reflect the codified knowledge flows from public research, but they appear to miss knowledge flows that are more private and contract-based in nature, as well as those used in firm basic research. We also find that firms' patenting and citing strategies affect patent citations, making citations less indicative of knowledge flows. In addition, an illustrative analysis examining the magnitude and direction of measurement error bias suggests that measuring knowledge flows with patent citations can lead to substantial underestimation of the effect of public research on firms' innovative performance. Throughout our analyses we find that nonpatent references (e.g., journals, conferences, etc.), not the more commonly used patent references, are a better measure of knowledge originating from public research.

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    Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 18292.

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    Date of creation: Aug 2012
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    Handle: RePEc:nbr:nberwo:18292
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    1. Megan MacGarvie, 2006. "Do Firms Learn from International Trade?," The Review of Economics and Statistics, MIT Press, vol. 88(1), pages 46-60, February.
    2. Jaffe, Adam B & Trajtenberg, Manuel & Henderson, Rebecca, 1993. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," The Quarterly Journal of Economics, MIT Press, vol. 108(3), pages 577-98, August.
    3. repec:fth:harver:1473 is not listed on IDEAS
    4. Lee Branstetter & Yoshiaki Ogura, 2005. "Is Academic Science Driving a Surge in Industrial Innovation? Evidence from Patent Citations," NBER Working Papers 11561, National Bureau of Economic Research, Inc.
    5. Giovanni Peri, 2005. "Determinants of Knowledge Flows and Their Effect on Innovation," The Review of Economics and Statistics, MIT Press, vol. 87(2), pages 308-322, May.
    6. Hicks, Diana, 1995. "Published Papers, Tacit Competencies and Corporate Management of the Public/Private Character of Knowledge," Industrial and Corporate Change, Oxford University Press, vol. 4(2), pages 401-24.
    7. Narin, Francis & Hamilton, Kimberly S. & Olivastro, Dominic, 1997. "The increasing linkage between U.S. technology and public science," Research Policy, Elsevier, vol. 26(3), pages 317-330, October.
    8. Jasjit Singh & Ajay K. Agrawal, 2010. "Recruiting for Ideas: How Firms Exploit the Prior Inventions of New Hires," NBER Working Papers 15869, National Bureau of Economic Research, Inc.
    9. Zvi Griliches, 1998. "Patent Statistics as Economic Indicators: A Survey," NBER Chapters, in: R&D and Productivity: The Econometric Evidence, pages 287-343 National Bureau of Economic Research, Inc.
    10. Jaffe, Adam B & Fogarty, Michael S & Banks, Bruce A, 1998. "Evidence from Patents and Patent Citations on the Impact of NASA and Other Federal Labs on Commercial Innovation," Journal of Industrial Economics, Wiley Blackwell, vol. 46(2), pages 183-205, June.
    11. Hall, B. & Jaffe, A. & Trajtenberg, M., 2001. "The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools," Papers 2001-29, Tel Aviv.
    12. Rebecca Henderson & Adam B. Jaffe & Manuel Trajtenberg, 1998. "Universities As A Source Of Commercial Technology: A Detailed Analysis Of University Patenting, 1965-1988," The Review of Economics and Statistics, MIT Press, vol. 80(1), pages 119-127, February.
    13. Alcácer, Juan & Gittelman, Michelle & Sampat, Bhaven, 2009. "Applicant and examiner citations in U.S. patents: An overview and analysis," Research Policy, Elsevier, vol. 38(2), pages 415-427, March.
    14. Scherer, F. M., 1983. "The propensity to patent," International Journal of Industrial Organization, Elsevier, vol. 1(1), pages 107-128, March.
    15. Jasjit Singh, 2005. "Collaborative Networks as Determinants of Knowledge Diffusion Patterns," Management Science, INFORMS, vol. 51(5), pages 756-770, May.
    16. Mowery, David C. & Ziedonis, Arvids A., 2002. "Academic patent quality and quantity before and after the Bayh-Dole act in the United States," Research Policy, Elsevier, vol. 31(3), pages 399-418, March.
    17. Wesley M Cohen & Richard R Nelson & John P Walsh, 2003. "Protecting Their Intellectual Assets: Appropriability Conditions and Why U.S. Manufacturing Firms Patent (Or Not)," Levine's Working Paper Archive 618897000000000624, David K. Levine.
    18. Pavitt, Keith, 1991. "What makes basic research economically useful?," Research Policy, Elsevier, vol. 20(2), pages 109-119, April.
    19. Horstmann, Ignatius & MacDonald, Glenn M & Slivinski, Alan, 1985. "Patents as Information Transfer Mechanisms: To Patent or (Maybe) Not to Patent," Journal of Political Economy, University of Chicago Press, vol. 93(5), pages 837-58, October.
    20. Paul Almeida & Bruce Kogut, 1999. "Localization of Knowledge and the Mobility of Engineers in Regional Networks," Management Science, INFORMS, vol. 45(7), pages 905-917, July.
    21. Zucker, Lynne G & Darby, Michael R & Brewer, Marilynn B, 1998. "Intellectual Human Capital and the Birth of U.S. Biotechnology Enterprises," American Economic Review, American Economic Association, vol. 88(1), pages 290-306, March.
    22. Sorenson, Olav & Fleming, Lee, 2004. "Science and the diffusion of knowledge," Research Policy, Elsevier, vol. 33(10), pages 1615-1634, December.
    23. Wesley M. Cohen & Richard R. Nelson & John P. Walsh, 2002. "Links and Impacts: The Influence of Public Research on Industrial R&D," Management Science, INFORMS, vol. 48(1), pages 1-23, January.
    24. David D. Friedman & William M. Landes & Richard A. Posner, 1991. "Some Economics of Trade Secret Law," Journal of Economic Perspectives, American Economic Association, vol. 5(1), pages 61-72, Winter.
    25. Jerry G. Thursby & Marie C. Thursby, 2000. "Who is Selling the Ivory Tower? Sources of Growth in University Licensing," NBER Working Papers 7718, National Bureau of Economic Research, Inc.
    26. Jerry Thursby & Anne Fuller & Marie Thursby, 2007. "US Faculty Patenting: Inside and Outside the University," NBER Working Papers 13256, National Bureau of Economic Research, Inc.
    27. Rosenberg, Nathan, 1990. "Why do firms do basic research (with their own money)?," Research Policy, Elsevier, vol. 19(2), pages 165-174, April.
    28. Lori Rosenkopf & Paul Almeida, 2003. "Overcoming Local Search Through Alliances and Mobility," Management Science, INFORMS, vol. 49(6), pages 751-766, June.
    29. Juan Alcácer & Michelle Gittelman, 2006. "Patent Citations as a Measure of Knowledge Flows: The Influence of Examiner Citations," The Review of Economics and Statistics, MIT Press, vol. 88(4), pages 774-779, November.
    30. DUGUET Emmanuel & MacGARVIE Megan, 2004. "How Well Do Patent Citations Measure Flows of Technology? Evidence from French Innovation Surveys," Development and Comp Systems 0411018, EconWPA.
    31. Ajay Agrawal & Rebecca Henderson, 2002. "Putting Patents in Context: Exploring Knowledge Transfer from MIT," Management Science, INFORMS, vol. 48(1), pages 44-60, January.
    32. David C. Mowery & Bhaven N. Sampat & Arvids A. Ziedonis, 2002. "Learning to Patent: Institutional Experience, Learning, and the Characteristics of U.S. University Patents After the Bayh-Dole Act, 1981-1992," Management Science, INFORMS, vol. 48(1), pages 73-89, January.
    33. Dietmar Harhoff & Francis Narin & F. M. Scherer & Katrin Vopel, 1999. "Citation Frequency And The Value Of Patented Inventions," The Review of Economics and Statistics, MIT Press, vol. 81(3), pages 511-515, August.
    34. Michelle Gittelman & Bruce Kogut, 2003. "Does Good Science Lead to Valuable Knowledge? Biotechnology Firms and the Evolutionary Logic of Citation Patterns," Management Science, INFORMS, vol. 49(4), pages 366-382, April.
    35. Cockburn, Iain M & Henderson, Rebecca M, 1998. "Absorptive Capacity, Coauthoring Behavior, and the Organization of Research in Drug Discovery," Journal of Industrial Economics, Wiley Blackwell, vol. 46(2), pages 157-82, June.
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