Verification of document similarity making use of compound noun that is extracted from patent information

Abstract

when patent examiner indicates a refusal to patent application,"Notice of Reason for Refusal" is issued. We have created a synonym dictionary of compound nouns using the information extracted from the Notice of Reason for Refusal, and extracted the dependency relationship of compound nouns and verbs in the claims full text written in patent applications.Between this patent application and the patent publication cited, we measured a similarity by using created formula.Then, when using the synonym dictionary, we investigated whether this synonym dictionary is effective.