In collaboration with others, I now made more systematically routines available at http://www.leydesdorff.net/software/uspatents that allow in addition to geographical mapping and mapping in terms of Intern. Patent Classifications to download the cited and citing patents in the USPTO domain (that is, since 1975).
Please, feel free to feedback with suggestions for improvements.
Professor, University of Amsterdam
Kloveniersburgwal 48, 1012 CX Amsterdam
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Honorary Professor, SPRU, University of Sussex; Visiting Professor, ISTIC, Beijing;