Abstract

http://ssrn.com/abstract=1888191
 
 

References (38)



 
 

Citations (2)



 


 



Patent Citations and the Size of Patented Inventions - Evidence from Hybrid Corn


Petra Moser


Stanford University - Department of Economics; National Bureau of Economic Research (NBER)

Joerg Ohmstedt


Booz & Company

Paul W. Rhode


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

April 8, 2013


Abstract:     
Although most empirical analyses use patents as a measure of innovation, patents may be noisy and biased due to unobservable variation in the size of patented inventions. Patent citations – counts of later patents that cite a patent as relevant prior art – have become the standard measure to control for such variation, but citations themselves may be noisy and biased. To address this issue, we match patents for hybrid corn with data on yields, as an objective measure for the size of patented improvements. These data reveal a robust positive correlation between citations and improvements in yields, suggesting that citations are a good measure for size. The data also show that inventors and examiners frequently cite a small group of early patents, as ‘prior art’ to establish patentability. Excluding these patents strengthens the correlation between citations and the size of patented inventions.

Number of Pages in PDF File: 38

Keywords: innovation, patents, intellectual property, hybrid corn

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

working papers series


Download This Paper

Date posted: July 18, 2011 ; Last revised: April 10, 2013

Suggested Citation

Moser, Petra and Ohmstedt, Joerg and Rhode, Paul W., Patent Citations and the Size of Patented Inventions - Evidence from Hybrid Corn (April 8, 2013). Available at SSRN: http://ssrn.com/abstract=1888191 or http://dx.doi.org/10.2139/ssrn.1888191

Contact Information

Petra Moser (Contact Author)
Stanford University - Department of Economics ( email )
Landau Economics Building
579 Serra Mall
Stanford, CA 94305-6072
United States
National Bureau of Economic Research (NBER)
1050 Massachusetts Avenue
Cambridge, MA 02138
United States
Joerg Ohmstedt
Booz & Company ( email )
101 Park Avenue
New York, NY 10178
United States
Paul 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
Feedback to SSRN


Paper statistics
Abstract Views: 791
Downloads: 176
Download Rank: 95,340
References:  38
Citations:  2

© 2014 Social Science Electronic Publishing, Inc. All Rights Reserved.  FAQ   Terms of Use   Privacy Policy   Copyright   Contact Us
This page was processed by apollo4 in 0.500 seconds