Hiroshima 731-3194,

This paper introduces the Patent Mining Task at the Eighth NTCIR Workshop and the test collections produced in this task. The purpose of the Patent Mining Task is to create technical trend maps from a set of research papers and patents. We performed two subtasks: (1) the subtask of research papers classification and (2) the subtask of technical trend map creation. For the subtask of research papers classification, six participant groups submitted 101 runs. For the subtask of technical trend map creation, nine participant groups submitted 40 runs. In this paper, we also report on the evaluation results of the task