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Inventor collaborations that span across regions facilitate the combinationand diffusion of innovation-related knowledge. While remote partnerships aregaining importance; most R&D cooperations remain embedded in local environmentsand little is known about how spatial patterns of creation and persistence ofties in large-scale co-inventor networks differ. We use the publicly availableOECD REGPAT database to construct a co-inventor network of the EU27 andcontinental EFTA countries from patents filed between 2006 and 2010, andidentify those ties that had been persisted from before 2006. A communitydetection exercise reveals that persisted collaborations cluster at a smallergeographical scale than what is observed in the full network. We find that ingeneral the estimated probability of persisted collaboration does not differfrom the complete collaboration network when geographical distance,technological similarity or the number of common third partners across regionsare assumed to influence tie probability separately. However, persistentcollaboration gains exceptional likelihood if regions are proximate in allthree dimensions. Our results therefore offer evidence that repeated inventorcollaboration drives regional innovation systems towards isolation, which is athreat for European innovation policy.

Inventor collaboration and its persistence across European regions