Using the Multi-level Classification Method in the Patent Mining Task at NTCIR-7

A patent includes a great deal of practical technical information, and plays an important role in promoting scientific development. The research on patent classification and retrieval has significant application value. A patent is a special technical text with strict hierarchical classification system and normalized structure, and there are a number of relations between patents and their constituents. Based on these relations, this paper proposes a weight calculation method using the patent title, and adopts a hierarchical classification method to complete the English and Japanese classification tasks at the NTCIR-7 patent mining. The effectiveness of the method is proved by corresponding evaluation.