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Medientyp:
E-Book
Titel:
Flows of Knowledge from Universities and Federal Labs
:
Modeling the Flowof Patent Citations Over Time and Across Institutional and Geographic Boundari
Erschienen:
Cambridge, Mass: National Bureau of Economic Research, August 1996
Erschienen in:NBER working paper series ; no. w5712
Umfang:
1 Online-Ressource
Sprache:
Englisch
DOI:
10.3386/w5712
Identifikator:
Reproduktionsnotiz:
Hardcopy version available to institutional subscribers
Entstehung:
Anmerkungen:
Mode of access: World Wide Web
System requirements: Adobe [Acrobat] Reader required for PDF files
Beschreibung:
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