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The article uses two hand-collected data sets to implement a novel research design for analyzing the precursors to patent quality. Operationalizing patent "quality" as legal validity, the article analyzes the relation between Federal Circuit decisions on patent validity and three sets of data about the patents: quantitative features of the patents themselves, textual analysis of the patent documents, and data collected from the prosecution histories of the patents. The article finds large anddoi:10.1111/j.1740-1461.2011.01245.x fatcat:ovdi35e2efh7jlvxwlmo7jsbvq