期刊
WORLD PATENT INFORMATION
卷 32, 期 1, 页码 3-21出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.wpi.2009.05.005
关键词
USPTO; Patent citation network; Technology categories; Network analysis; Technology productivity; Patent originality; Citation trade; Disequilibrium citation rates; Citation conservation
The network of patent citations is a collection of clumps of citations between closely related patents, with the largest clumps being defined by patent technology categories. The exchange of citations between these groups evolves over time and reveals technological trends. By using USPTO data and considering the evolution of backwards-and forwards-, and intra-and inter-citations, conclusions about the generality, originality, and productivity of patents and technology categories can be drawn. (C) 2009 Elsevier Ltd. All rights reserved.
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