We propose a method to automatically extract "characteristic terms" from several patent documents belonging to a certain technical field. The characteristic terms extracted by the proposed method are useful for technology trend analysis. For example, in the case of patent documents relating to organic electroluminescence, the characteristic term expresses the characteristic of the technology shown in the patents, e.g., "発光効率" (hakkoukouritu: luminous efficiency) or "輝 度" (kido: brightness). The proposed method was evaluated and good results were obtained.
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