The Private Value of Software Patents

65 Pages Posted: 25 May 2006 Last revised: 7 Nov 2014

See all articles by Bronwyn H. Hall

Bronwyn H. Hall

University of California at Berkeley; National Bureau of Economic Research (NBER); Institute for Fiscal Studies (IFS); Max Planck Institute for Innovation and Competition

Megan MacGarvie

Boston University School of Management; National Bureau of Economic Research (NBER)

Date Written: May 2006

Abstract

We investigate the value creation or destruction associated with the introduction of software patents in the United States in two ways. The first looks at the cumulative abnormal returns to Information and Communication Technology (ICT) firms around the time of important court decisions that impacted software patents, and the second analyzes the relationship between firms' stock market value, the sector in which they operate, and their holdings of software patents. We conclude that the market evaluated software patents as a negative development ex ante. Ex post, a greater number of firms in all ICT sectors invested in these patents, and these firms had slightly higher market values than those with no software patents. However, while we obtain clear evidence that the technological importance or quality of patented innovation mattered for the market value of hardware firms both before and after the legal changes, it is less clear that the marginal patent right per se was associated with increases in market value, and there are no significant valuation effects associated with patents for pure software firms after the change.

Suggested Citation

Hall, Bronwyn H. and MacGarvie, Megan, The Private Value of Software Patents (May 2006). NBER Working Paper No. w12195. Available at SSRN: https://ssrn.com/abstract=900981

Bronwyn H. Hall (Contact Author)

University of California at Berkeley ( email )

549 Evans Hall #3880
Berkeley, CA 94720-3880
United States

HOME PAGE: http://emlab.berkeley.edu/users/bhhall/index.html

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

Institute for Fiscal Studies (IFS)

7 Ridgmount Street
London, WC1E 7AE
United Kingdom

Max Planck Institute for Innovation and Competition

Marstallplatz 1
Munich, Bayern 80539
Germany

Megan MacGarvie

Boston University School of Management ( email )

595 Commonwealth Avenue
Boston, MA 02215
United States

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

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