This paper presents the automatic patent information retrieval system developed by Toa Paint Co., Ltd. In this system, the partial matching method is used in the retrieval operation. It is possible, therefore, to use sentenses or words written in Japanese natural language as retrieval keys. Further, the standardization of terms which is widely used in other systems is not necessary. In this report, the outline of this system, the forms of input and output, the retrieval method and the time required in retrieval operations are described.
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