Organization and Staff
Classification Standards and Development maintains the patent classification systems.
Cooperative Patent Classification (CPC)
The Cooperative Patent Classification (CPC) effort is a joint partnership between the United States Patent and Trademark Office (USPTO) and the European Patent Office (EPO) where the Offices have agreed to harmonize their existing classification systems (European Classification (ECLA) and United States Patent Classification (USPC) respectively) and migrate towards a common classification scheme.
I don’t know anything about CPC. Where do I start?
- Use the USPTO and EPO bi-lateral Cooperative Patent Classification (CPC)(link is external) informational site on WWW
- Start browsing the CPC scheme on www.uspto.gov
I know a USPC classification and I want to find a relevant CPC. What do I do?
- Use the Classification Search Page to look up a Statistical Mapping from USPC to CPC.
I know a CPC group symbol (e.g., B02C 19/0081) and I want to see the group title, browse the scheme or read its definition. How do I do this?
- Use the Classification Search Page to look up a CPC Scheme or Definition by CPC Symbol
I want to download CPC scheme and definition source files (e.g., XML, PDF); and CPC to IPC concordance files. How do I do this?
- For CPC Schemes and Definitions use the CPC Schemes and Definitions Bulk data page(link is external) (link is external), on the Cooperative Patent Classification bi-lateral website to download this information.
- For CPC to IPC Concordance files use the CPC Concordances page(link is external) (link is external), on the Cooperative Patent Classification bi-lateral website to download this information.
Additional CPC Resources:
The CPC Notice of Changes are the official record of change for the Cooperative Patent Classification system. Read more
United States Patent Classification (USPC) Resources
I don’t know anything about USPC. Where do I start?
- Use the Index to USPC to browse an alphabetical listing of concepts and access relevant USPC classification schedules.
- Use the Seven Step Strategy suggested by the Patent and Trademark Resource Center to find relevant classifications.
- Review special guides to USPC and IPC
- Browse a listing of USPC Class numbers and titles
- Consult the Consolidated Glossary of USPC Terms used in USPC definitions
- Consider additional guides
I know a USPC classification symbol (e.g., Class 345 or Class/Subclass 345/418) and I want to:
- browse the USPC classification schedule or USPC classification definition
- Use the Classification Search Page to look up a USPC schedule or definition by USPC symbol
- find a relevant CPC
- Look up a Statistical Mapping from USPC to CPC by using the Classification Search Page to, or
- find a relevant International Patent Classification (IPC)
Documents and Reports Related to the USPC Manual of Classification
- Classes Within the U.S. Classification System Arranged by Related Subject Matter [PDF]
- Classes Arranged in Alphabetical Order [PDF]
- Consolidated Glossary of USPC Terms
I want to understand more about how USPC has changed over time
A Classification Order documents changes to the UPSC which have occurred while maintaining the system over time. A Classification Order identifies Reclassification Project team members, USPC classifications abolished, USPC classifications established, new classification definitions and changes to existing classification definitions.
- Classification Under Reclass [PDF]
- Classes in the U.S. Patent Classification System – Dates Established
- Use the Classification Orders
- Classification Order Index (COI)
- Classification Orders Archival Report [PDF]
Relationships between classifications and organizations
- Classes Arranged by Art Unit (CAAU)
- Classes Arranged by Art Unit (CAAU) [PDF]
- Classes Arranged Numerically With Art Unit and Search Room Locations (CAN)
- Classes Arranged Numerically With Art Unit and Search Room Locations (CAN) [PDF]
Lists of withdrawn USPTO Patent Publications
International Classification Resources
Related Patent Links