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902    Search Tools and Classification Information [R-07.2015]

There are multiple classification systems used throughout the international patent system. These include the Cooperative Patent Classification System (CPC), U.S. Patent Classification System (USPC), the International Patent Classification System (IPC), and the Locarno International Classification (Locarno). All U.S. patents and U.S. Patent Application Publications published after December 31, 2014 will no longer receive classifications within the USPC. The USPC will, at that time, become a static searchable database.