About the International Patent Classification (IPC)

• Preface to the IPC
• Guide to the IPC [version 2009 PDF]
• Introduction to the Internet version of the IPC
• IPC Reform
• Frequently Asked Questions about the IPC

Related links:

• Guidelines for Revision of the IPC [PDF] [DOC]
• Guidelines for Determining Subject Matter to be Classified [PDF] [DOC]
• Guidelines for Determining Where to Classify Patent Documents [PDF] [DOC]
• WIPO Standard ST.8 (Standard Recording of International Patent Classification (IPC) Symbols on Machine-Readable Records) [PDF]
• Use of the eighth edition of the IPC by industrial property offices (start date, core or advanced level, reclassification plans) [PDF] [DOC]