Analysis: esp@cenet data retrieval system contains the following databases: WIPO- esp@cenet patent database: descriptive data containing PCT applications published in the last 24 months. EP-esp@cenet patent database: contains descriptive data of European patent applications published in the past 24 months. Global patent database: As of June 2006 1 1 day, it contains 56 million patents from more than 80 countries. Among them, 29.8 million have invention names, 28.9 million have ECLA classification numbers, and180,000 have English abstracts; It is based on the minimum number of PCT files.