Our group participated in the Japanese and English Retrieval Subtasks of TCIR-6. Our goal was to evaluate the effectiveness of a thesaurus constructed from patents for invalidity search. To confirm the effectiveness of our thesaurus-based query expansion, we conducted experiments and found that our method can improve upon traditional document retrieval systems.

In the Fifth NTCIR Workshop, we organized the Patent Retrieval Task and performed three subtasks; Document Retrieval, Passage Retrieval, and Classification. This paper describes the Document Retrieval Subtask and Passage Retrieval Subtask, both of which were intended for patent-to-patent invalidity search task. We show the evaluation results of the groups participating in those subtasks.

Ertapenem is a carbapenem that shares the activity of imipenem and meropenem against most species, but is less active against non-fermenters. Activity is retained against most strains with AmpC and extended-spectrum beta-lactamases, although resistance can arise if these enzymes are combined with extreme impermeability. Resistance can also be caused by IMP, VIM, KPC and NMC carbapenemases, but ...