Abstract

http://ssrn.com/abstract=1888191
 
 

Citations (2)



 


 



Patent Citations - An Analysis of Quality Differences and Citing Practices in Hybrid Corn


Petra Moser


Leonard N. Stern School of Business - Department of Economics; National Bureau of Economic Research (NBER)

Joerg Ohmstedt


Bain & Company; Cornell University - Department of Economics

Paul W. Rhode


University of North Carolina (UNC) at Chapel Hill - Department of Economics; National Bureau of Economic Research (NBER); University of Arizona

March 5, 2016


Abstract:     
A growing empirical literature uses patent citations as a quality-adjusted measure for innovation, despite concerns about the validity of this measure. This paper links patents with objective measures of improvements in the quality of patented inventions – measured through performance in field trials for hybrid corn – to examine three potential factors that influence citations: 1) improvements in performance 2) citing practices of patent attorneys, and 3) citing practices of patent examiners. This analysis reveals that citations are robustly correlated with performance, which confirms that citations are a useful quality-adjusted measure for innovation. The citing practices of patent attorneys and examiners, however, also influence citations. Patent attorneys cite early patents, which help establish the patentability of an invention; this practice may inflate citation counts for early patents, particularly for inventions that have only recently become patentable. Attorneys also add self-citations; our analysis indicates that that self-citations can be an indicator of follow-on invention. By comparison, examiner-added citations are typically unrelated to improvements in performance or follow-on invention.

Number of Pages in PDF File: 52

Keywords: innovation, patents, intellectual property, hybrid corn

JEL Classification: O30, O31, O33, O34, L70, Q10


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Date posted: July 18, 2011 ; Last revised: March 14, 2016

Suggested Citation

Moser, Petra and Ohmstedt, Joerg and Rhode, Paul W., Patent Citations - An Analysis of Quality Differences and Citing Practices in Hybrid Corn (March 5, 2016). Available at SSRN: http://ssrn.com/abstract=1888191 or http://dx.doi.org/10.2139/ssrn.1888191

Contact Information

Petra Moser (Contact Author)
Leonard N. Stern School of Business - Department of Economics ( email )
269 Mercer Street
New York, NY 10003
United States
National Bureau of Economic Research (NBER)
1050 Massachusetts Avenue
Cambridge, MA 02138
United States
Joerg Ohmstedt
Bain & Company ( email )
Two Copley Place
Boston, MA 02118
United States
Cornell University - Department of Economics ( email )
414 Uris Hall
Ithaca, NY 14853-7601
United States
Paul W. Rhode
University of North Carolina (UNC) at Chapel Hill - Department of Economics ( email )
Chapel Hill, NC 27599
United States
National Bureau of Economic Research (NBER)
1050 Massachusetts Avenue
Cambridge, MA 02138
United States
University of Arizona
Tucson, AZ 85721
United States
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