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Experiments submitted to the CLEF-IP campaign. Patent documents produced worldwide have manually-assigned classification codes which in our work are used to cluster, distribute and index patents through hundreds or thousands of sub-collections. We tested different combinations of source selection (CORI, BordaFuse, Reciprocal Rank) and results merging algorithms (SSL, CORI). We also tested different combinations of the number of collections requested and documents retrieved from each collection. . According to PRES @100 our best DIR approach ranked 7th across 31 submitted results, however our best DIR (not submitted) run outperforms all submitted runs.