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Exploring the patent explosion

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Author Info
Bronwyn Hall

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Abstract

This paper looks more closely at the sources of patent growth in the United States since 1984. It confirms that the increase is largely due to US patenters, with an earlier surge in Asia, and some increase in Europe. Growth has taken place in all technologies, but not in all industries, being concentrated in the electrical, electronics, computing, and scientific instruments industries. It then examines whether these patents are valued by the market. We know from survey evidence that patents in these industries are not usually considered important for appropriability, but are sometimes considered necessary to secure financing for entering the industry. I compare the market value of patents held by entrant firms to those held by incumbents (controlling for R&D). Using data on publicly traded firms 1980-1989, I find that in industries based on electrical and mechanical technologies the market value of entrantsÕ patents is positive in the post-1984 period (after the patenting surge), but not before, when patents were relatively unimportant in these industries. Also, the value of patent rights in complex product industries (where each product relies on many patents held by a number of other firms) is much higher for entrants than incumbents in the post-1984 period. For discrete product industries (where each product relies on only a few patents, and where the importance of patents for appropriability has traditionally been higher), there is no difference between incumbents and entrants.

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Paper provided by ESRC Centre for Business Research in its series ESRC Centre for Business Research - Working Papers with number wp291.

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Date of creation: Sep 2004
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Handle: RePEc:cbr:cbrwps:wp291

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Related research
Keywords: patents; market value; information technology; appropriability;

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Find related papers by JEL classification:
O34 - Economic Development, Technological Change, and Growth - - Technological Change - - - Intellectual Property Rights
L10 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - General
G24 - Financial Economics - - Financial Institutions and Services - - - Investment Banking; Venture Capital; Brokerage

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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.:
  1. Bronwyn H. Hall & Adam Jaffe & Manuel Trajtenberg, 2005. "Market Value and Patent Citations," RAND Journal of Economics, The RAND Corporation, vol. 36(1), pages 16-38, Spring.
  2. Richard C. Levin & Alvin K. Klevorick & Richard R. Nelson & Sidney G. Winter, 1988. "Appropriating the Returns from Industrial R&D," Cowles Foundation Discussion Papers 862, Cowles Foundation, Yale University. [Downloadable!]
  3. Bronwyn H. Hall., 1993. "Industrial Research During the 1980s: Did the Rate of Return Fall?," Economics Working Papers 93-217, University of California at Berkeley.
  4. Griliches, Zvi, 1981. "Market value, R&D, and patents," Economics Letters, Elsevier, vol. 7(2), pages 183-187. [Downloadable!] (restricted)
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  5. Jinyoung Kim & Gerald Marschke, 2004. "Accounting for the recent surge in U.S. patenting: changes in R&D expenditures, patent yields, and the high tech sector," Economics of Innovation and New Technology, Taylor and Francis Journals, vol. 13(6), pages 543-558, September. [Downloadable!] (restricted)
  6. Kortum, Samuel & Lerner, Josh, 1998. "Stronger protection or technological revolution: what is behind the recent surge in patenting?," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 48(1), pages 247-304, June. [Downloadable!] (restricted)
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  7. Bronwyn, H.H., 1993. "Industrial Research During the 1980s: Did the Rate of Return Fall?," Papers e-93-10, Stanford - Hoover Institution.
  8. Richard C. Levin & Alvin K. Klevorick & Richard R. Nelson & Sidney G. Winter, 1987. "Appropriating the Returns from Industrial Research and Development," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 18(1987-3), pages 783-832. [Downloadable!]
  9. 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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