What are the different types of references in CPC Definitions?

CPC Definitions include several types of references, each serving a specific purpose in patent classification. According to MPEP 905.02, the main types of references are:

• Limiting and precedence references: These define the boundaries of classification places.
• Specially adapted references: These point from function-oriented (general) to application-oriented places.
• Residual references: These are found in residual subclasses and point to non-residual places.
• Informative references: These indicate subject matter that could be of interest for searching but are not within the scope of the classification place.

The MPEP states, “References from application-oriented places to function-oriented places are informative.” This helps in understanding the relationship between different classification places and aids in comprehensive patent searches.

To learn more:

• CPC References
• Limiting References
• Specially Adapted References
• Residual References
• Informative References