The Office of Patent Classification maintains the U.S. Patent Classification system.

Organization and Staff

• Classification Divisions and Contact Numbers

Patent Classification Resources

• Classification Concordance Patents, USPC to IPC
• Classification Definitions, Patent
• Classification Definitions, Printable Definitions [PDF]
• Classification Index, Patents
• Classification Manual, Patents
• Classification Manual, Printable Schedules [PDF]
• International Classification Resources
• Classification Orders
• Reclassification Alert Report [PDF]
• Classification Orders Index
• Classification Orders Index, Printable Index [PDF]
• Classification Orders Archival Report [PDF]
• All Withdrawn PGPubs
• All Withdrawn PGPubs, Printable File [PDF]
• Examiner's Handbook
• Handbook of Classification [PDF]
• Classes in the U.S. Patent Classification System - Dates Established
• Classification Under Reclass [PDF]

Documents and Reports Related to the Manual of Classification

• Overview of the Classification System [PDF]
• Classes Within the U.S. Classification System (Arranged by Related Subjects) [PDF]
• Classes Arranged by Art Unit
• Classes Arranged by Art Unit [PDF]
• Classes Arranged Numerically With Art Unit and Search Room Locations
• Classes Arranged Numerically With Art Unit and Search Room Locations, Printable File [PDF]
• Classes Arranged in Alphabetical Order [PDF]

Related Patent Links

• Search and Information Resources Administration Page
• Patents Main Page

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