US Patent 8977613 Generation of recurring searches

Some embodiments provide a method for generating a recurring search for a research system that identifies documents as relevant to particular categories. The method generates a set of categories to include in the recurring search based on an identified user objective and an initial category by using relationship data that defines several different types of relationships between several different categories. The recurring search identifies documents from a particular period of time identified as relevant to the set of categories. The method identifies an optimal set of filters for removing specific types of documents that are relevant to the set of categories from the recurring search.