Derwent World Patents Index Classification System

English Abstract: 

"Companies often use different names for the same invention, and additional variation may be introduced when the patent application is translated into different languages. Also some keywords can appear in many different contexts within patent titles. For example the word 'valve' can be either mechanical or electrical. So a subject classification system is essential for effective patent searching.
DWPI categorizes patent documents using a simple classification system for all technologies. This unique classification is consistently applied to all patents by Thomson Scientific subject experts, enabling effective and precise searching in a particular area of technology. Patents are divided into three broad areas: Chemical, Engineering, and Electronic and Electrical Engineering. Each of these is then further divided into Sections and Classes which describe the technical area, or areas, covered by the patent."

Alternative Title: 
DWPI Classification System
English Title: 
Derwent World Patents Index Classification System
Author: 
Thomson Reuters
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