About the difference in result by the difference of the analysis point of view(<Special feature>Patent information: Analysis and effective utilization)

The patent information has many fields including patent system, and is changing from filing date to expire date. Knowing the purpose of the use is the most important thing to do because the processing method and the information to collect varies depending on the purpose. This article reports difference in result by the difference of the analysis point of view, check points of using representative fields including applicant's name, filing date, and patent classification.