What are the main classification systems used in international patent law?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-27 4 Rules 5 Related FAQs This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice. According to the MPEP 902 , there are multiple classification systems used throughout the international patent system. These include: Cooperative Patent Classification System (CPC) U.S. Patent Classification System (USPC) International Patent Classification System (IPC) Locarno International Classification (Locarno) The MPEP states: “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).” Related Rules from the Manual of Patent Examining Procedure 4 rules Collapse Classification Orders Affect Existing Definitions MPEP 902.02 Recommended Examiner Definitions Must Be Updated Periodically MPEP 902.02 Recommended Classification Orders Available Online for USPTO Personnel MPEP 902.02 Classification Home Page Must Be Accessible via Toolkit MPEP 902.02 Other Related FAQs 5 FAQs Collapse How can patent examiners access the Classification Home Page? How can I access the Cooperative Patent Classification (CPC) system? What automated search tools are available to patent examiners? How does the Cooperative Patent Classification (CPC) system work? What is the purpose of the Cooperative Patent Classification (CPC) system?