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Media type:
E-Book
Title:
Flows of Knowledge from Universities and Federal Labs
:
Modeling the Flowof Patent Citations Over Time and Across Institutional and Geographic Boundari
Published:
Cambridge, Mass: National Bureau of Economic Research, August 1996
Published in:NBER working paper series ; no. w5712
Extent:
1 Online-Ressource
Language:
English
DOI:
10.3386/w5712
Identifier:
Reproduction note:
Hardcopy version available to institutional subscribers
Origination:
Footnote:
Mode of access: World Wide Web
System requirements: Adobe [Acrobat] Reader required for PDF files
Description:
The extent to which new technological knowledge flows across institutional and national boundaries is a question of great importance for public policy and the modeling of economic growth. This paper develops a model of the process generating subsequent citations to patents as a lens for viewing knowledge diffusion. We find that the probability of patent citation over time after a patent is granted fits well to a double-exponential function that can be interpreted as the mixture of diffusion and obsolescence functions. The results indicate that diffusion is geographically localized. Controlling for other factors, within-country citations are more numerous and come more quickly than those that cross country boundaries