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Derwent Innovations Index, 1963-presentFacilitates precise patent searching, letting you conduct patent and citation searches of inventions in chemical, electrical, electronic, and mechanical engineering. Also merges value-added patent information with patent citation information.
SciencDirect has a "References" field that can be proximity searched to find patent numbers, inventors, and title words
Web of Science Core CollectionThe Web of Science Core Collection provides comprehensive coverage of the sciences, social sciences, and arts, and humanities across journals, books and conference proceedings. It indexes more than 5,700 major journals across 164 scientific disciplines. The best database for finding what papers have cited other papers. Cited references can be traced forward in time. Web of Science Training Materials available here: http://wokinfo.com/training_support/training/web-of-science