The Geography and Co-Location of European Technology-Speci fic Co-Inventorship Networks

University of Hohenheim FZID Discussion Paper No. 14-2010

45 Pages Posted: 5 Jun 2010

Multiple version iconThere are 2 versions of this paper

Date Written: November 30, 2009


This paper contributes with empirical findings to European co-inventorship location and geographical coincidence of co-patenting networks. Based on EPO co-patenting information for the reference period 2000-2004, we analyze the spatial con figuration of 44 technology-speci fic co-inventorship networks. European co-inventorship (co-patenting) activity is spatially linked to 1259 European NUTS3 units (EU25 CH NO) and their NUTS1 regions by inventor location. We extract 7.135.117 EPO co-patenting linkages from our own relational database that makes use of the OECD RegPAT (2009) files. The matching between International Patent Classi cation (IPC) subclasses and 44 technology fields is based on the ISI-SPRU-OST-concordance. We con rm the hypothesis that the 44 co-inventorship networks diff er in their overall size (nodes, linkages, self-loops) and that they are dominated by similar groupings of regions. The paper o ffers statistical evidence for the presence of highly localized European co-inventorship networks for all 44 technology fields, as the majority of linkages between NUTS3 units (counties and districts) are within the same NUTS1 regions. Accordingly, our findings helps to understand general presence of positive spatial autocorrelation in regional patent data. Our analysis explicitly accounts for di fferent network centrality measures (betweenness, degree, eigenvector). Spearman rank correlation coeffcients for all 44 technology fields con firm that most co-patenting networks co-locate in those regions that are central in several technology-speci fic co-patenting networks. These findings support the hypothesis that leading European regions are indeed multi- field network nodes and that most research collaboration is taking place in dense co-patenting networks.

Keywords: Co-Patenting, Co-Inventorship, Networks, Linkages, Co-Location, RegPAT

JEL Classification: C8, O31, O33, R12

Suggested Citation

Christ, Julian Phillip, The Geography and Co-Location of European Technology-Speci fic Co-Inventorship Networks (November 30, 2009). University of Hohenheim FZID Discussion Paper No. 14-2010, Available at SSRN: or

Julian Phillip Christ (Contact Author)

Duale Hochschule Baden-Württemberg ( email )

Friedrichstraße 14
Stuttgart, 70174

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