Exploring the patent explosion
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.
|Date of creation:||Sep 2004|
|Date of revision:|
|Contact details of provider:|| Web page: http://www.cbr.cam.ac.uk/|
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.:
- Lichtenberg, Frank R & Griliches, Zvi, 1989.
"Errors of Measurement in Output Deflators,"
Journal of Business & Economic Statistics,
American Statistical Association, vol. 7(1), pages 1-9, January.
- Hall, B. & Jaffe, A. & Trajtenberg, M., 2001.
"The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools,"
2001-29, Tel Aviv.
- Hall, Bronwyn H & Jaffe, Adam B & Trajtenberg, Manuel, 2001. "The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools," CEPR Discussion Papers 3094, C.E.P.R. Discussion Papers.
- Bronwyn H. Hall & Adam B. Jaffe & Manuel Trajtenberg, 2001. "The NBER Patent Citation Data File: Lessons, Insights and Methodological Tools," NBER Working Papers 8498, National Bureau of Economic Research, Inc.
- 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.
- Samuel Kortum & Josh Lerner, 1997. "Stronger Protection or Technological Revolution: What is Behind the Recent Surge in Patenting?," NBER Working Papers 6204, National Bureau of Economic Research, Inc.
- Hall, Bronwyn H., 1993.
"Industrial Research During the 1980s: Did the Rate of Return Fall?,"
Department of Economics, Working Paper Series
qt33d879r9, Department of Economics, Institute for Business and Economic Research, UC Berkeley.
- 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.
- 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(3), pages 783-832.
- 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 & Francis Journals, vol. 13(6), pages 543-558.
- Gerald Marschke & Jinyoung Kim, 2002. "Accounting for the recent surge in U.S. patenting: Changes in R&D expenditures, patent yields, and the high tech sector," Discussion Papers 02-10, University at Albany, SUNY, Department of Economics.
- 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 for Research in Economics, Yale University.
- Rosemarie Ham Ziedonis, 2004. "Don't Fence Me In: Fragmented Markets for Technology and the Patent Acquisition Strategies of Firms," Management Science, INFORMS, vol. 50(6), pages 804-820, June.
- Griliches, Zvi, 1981.
"Market value, R&D, and patents,"
Elsevier, vol. 7(2), pages 183-187.
When requesting a correction, please mention this item's handle: RePEc:cbr:cbrwps:wp291. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Howard Cobb)
If references are entirely missing, you can add them using this form.