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Classes

IPC Revised (ICR) The International Patent Classification system (IPC) is a hierarchical system which uses language-independent symbols to classify patents and utility models according to the area of technology to which they relate.
The IPC Revised (ICR) is a hierarchical system that is updated (revised) at regular intervals in order to include the latest developments in science and technology.
IPC Original (IPO) The International Patent Classification system (IPC) is a hierarchical system which uses language-independent symbols to classify patents and utility models according to the area of technology to which they relate.
US Classes The USPC is a system for organizing all U.S. patent documents and many other technical documents into relatively small collections based on common subject matter. 
CPCThe Cooperative Patent Classification system is a patent classification system, which has been jointly developed by the European Patent Office (EPO) and the United States Patent and Trademark Office (USPTO). It is an extension of the International Patent Classification (IPC) system which further classifies patent documents into specialized categories and is used by more than 45 patent offices. 
FI (File Index) The File Index is developed and maintained by Japanese Patent Office. It is a granular classification that is specific to Japanese prior art. 
FTERMThe File Forming Terms (FTERM) is developed and maintained by Japanese Patent Office. It is a granular classification that is specific to Japanese prior art.
Locarno Classes The Locarno Classification is an international classification system used to classify goods for the purposes of the registration of industrial designs. 
IPC All Versions (IC) It includes all the classifications from all the versions of IPC.
IPC Main (ICSC) It involves all the main sections of International Patent Classification system.
CPC Main Group (CPCG) It involves all the main groups of Cooperative Patent Classification system.
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