G2TT
来源类型Discussion paper
规范类型论文
来源IDDP6902
DP6902 International Portfolios, Capital Accumulation and Foreign Assets Dynamics
Robert Kollmann; Philippe Martin; Nicolas Coeurdacier
发表日期2008-07-11
出版年2008
语种英语
摘要We investigate incidence and evolution of patent thickets. Our empirical analysis is based on a theoretical model of patenting in complex and discrete technologies. The model captures how competition for patent portfolios and complementarity of patents affect patenting incentives. We show that lower technological opportunities increase patenting incentives in complex technologies while they decrease incentives in discrete technologies. Also, more competitors increase patenting incentives in complex technologies and reduce them in discrete technologies. To test these predictions a new measure of the density of patent thickets is introduced. European patent citations are used to construct measures of fragmentation and technological opportunity. Our empirical analysis is based on a panel capturing patenting behavior of 2074 firms in 30 technology areas over 15 years. GMM estimation results confirm the predictions of our theoretical model. The results show that patent thickets exist in 9 out of 30 technology areas. We find that decreased technological opportunities are a surprisingly strong driver of patent thicket growth.
主题Industrial Organization
关键词Complexity Patent portfolios Patent thickets Patenting Technological opportunities
URLhttps://cepr.org/publications/dp6902
来源智库Centre for Economic Policy Research (United Kingdom)
资源类型智库出版物
条目标识符http://119.78.100.153/handle/2XGU8XDN/535738
推荐引用方式
GB/T 7714
Robert Kollmann,Philippe Martin,Nicolas Coeurdacier. DP6902 International Portfolios, Capital Accumulation and Foreign Assets Dynamics. 2008.
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