Derwent World Patents Index - EPI Manual Codes

This User Manual is intended to assist users of the General and Mechanical Patents Index (GMPI) and Electrical Patents Index (EPI) Service in making the best use of the classification and indexing (Manual Coding) scheme which Clarivate Analytics applies to all patents covered.

Part 1 includes a general introduction and a list of codes from P1 (Agriculture) to T06 (Process and Machine Control)

The Second part includes a list of codes from U11 (Semiconductor Materials and Processes) to X27: Domestic Electrical Appliances.

The third part of the EPI Manual Codes User Guide is intended to be used in conjunction with Parts 1 and 2. It includes an alphabetical list of topics and the corresponding manual codes.

Last update: January 2020