NTCIR-5 Patent Retrieval Experiments at RICOH
Itoh Hideo · 2015
Focusing on the IPC (International Patent Classi-cation) of patent, two retrieval methods were exam-ined. One is to use the IPC code of the query patent and the other is to exploit the codes assigned to top-N retrieved patents in a similar manner of pseudo-relevance feedback. In both methods, the codes were used as constraint on retrieval results. As a result, we found the former is clearly effective and the latter’s effect is positive but small. Another point of our ex-periments is exploitation of synonyms, which were au-tomatically collected from a machine-readable dictio-nary for each query term.