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Patents, Citations and Innovations: Tracing the Links

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  • Manuel Trajtenberg

Abstract

The goal is to tackle anew the main problems encountered in using patent data in economic research, namely, the large variance in the value of patents, and the difficulties in matching patents with economic categories. The first is addressed with the aid of patent citations, the second with computerized search techniques for large databases. The proposed solutions are applied to the case of Computed Tomography (CT) Scanners, a pathbreaking innovation in medical technology. The main findings are that patents weighted by citations are highly correlated with the value of innovations, and that important innovations generate further innovative activity (R&D), and hence bring about down-the-line patents.

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File URL: http://www.nber.org/papers/w2457.pdf
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Bibliographic Info

Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 2457.

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Date of creation: Dec 1987
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Publication status: published as "A Penny for Your Quotes: Patent Citations and the Value of Innovations," The Rand Journal of Economics, Spring 1990, 21(1), 172-187.
Handle: RePEc:nbr:nberwo:2457

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References

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  1. Lieberman, Marvin B., 1987. "Patents, learning by doing, and market structure in the chemical processing industries," International Journal of Industrial Organization, Elsevier, vol. 5(3), pages 257-276.
  2. Ariel Pakes & Mark Schankerman, 1979. "The Rate of Obsolescence Of Knowledge, Research Gestation Lags, and the Private Rate of Return to Research Resources," NBER Working Papers 0346, National Bureau of Economic Research, Inc.
  3. Carpenter, Mark P. & Narin, Francis, 1983. "Validation study: Patent citations as indicators of science and foreign dependence," World Patent Information, Elsevier, vol. 5(3), pages 180-185.
  4. Bresnahan, Timothy F, 1986. "Measuring the Spillovers from Technical Advance: Mainframe Computers inFinancial Services," American Economic Review, American Economic Association, vol. 76(4), pages 742-55, September.
  5. Mansfield, Edwin, et al, 1977. "Social and Private Rates of Return from Industrial Innovations," The Quarterly Journal of Economics, MIT Press, vol. 91(2), pages 221-40, May.
  6. Gort, Michael & Wall, Richard A, 1986. "The Evolution of Technologies and Investment in Innovation," Economic Journal, Royal Economic Society, vol. 96(383), pages 741-57, September.
  7. 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.
  8. Frederic Scherer, 1984. "Using Linked Patent and R&D Data to Measure InterindustryTechnology Flows," NBER Chapters, in: R & D, Patents, and Productivity, pages 417-464 National Bureau of Economic Research, Inc.
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Citations

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Cited by:
  1. C. Gay & C. Le Bas & P. Patel & K. Touach, 2005. "The determinants of patent citations: an empirical analysis of French and British patents in the US," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 14(5), pages 339-350.
  2. C. Gay & C. Le Bas, 2005. "Uses without too many abuses of patent citations or the simple economics of patent citations as a measure of value and flows of knowledge," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 14(5), pages 333-338.

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