An algorithm for drawing general undirected graphs
Information Processing Letters
Journal of the American Society for Information Science and Technology
Journal of the American Society for Information Science and Technology
Patent classifications as indicators of intellectual organization
Journal of the American Society for Information Science and Technology
Toward a consensus map of science
Journal of the American Society for Information Science and Technology
Science overlay maps: A new tool for research policy and library management
Journal of the American Society for Information Science and Technology
Journal of the American Society for Information Science and Technology
A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS
Journal of the American Society for Information Science and Technology
Journal of the American Society for Information Science and Technology
Journal of the American Society for Information Science and Technology
Exploratory Social Network Analysis with Pajek
Exploratory Social Network Analysis with Pajek
Journal of the American Society for Information Science and Technology
Publish or patent: Bibliometric evidence for empirical trade-offs in national funding strategies
Journal of the American Society for Information Science and Technology
Mapping (USPTO) patent data using overlays to Google Maps
Journal of the American Society for Information Science and Technology
Bibliometric perspectives on medical innovation using the medical subject Headings of PubMed
Journal of the American Society for Information Science and Technology
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We report on the development of an interface to the US Patent and Trademark Office (USPTO) that allows for the mapping of patent portfolios as overlays to basemaps constructed from citation relations among all patents contained in this database during the period 1976---2011. Both the interface and the data are in the public domain; the freeware programs VOSViewer and/or Pajek can be used for the visualization. These basemaps and overlays can be generated at both the 3-digit and 4-digit levels of the International Patent Classification (IPC) of the world intellectual property organization (WIPO). The basemaps can provide a stable mental framework for analysts to follow developments over searches for different years, which can be animated. The full flexibility of the advanced search engines of USPTO are available for generating sets of patents and/or patent applications which can thus be visualized and compared. This instrument allows for addressing questions about technological distance, diversity in portfolios, and animating the developments of both technologies and technological capacities of organizations over time.