What are the different types of references in CPC Definitions?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-27 10 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. 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. Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse References from Application-Oriented to Function-Oriented Places Are Informative MPEP 905.02 Specially Adapted References Must Point to Application-Oriented Places MPEP 905.02 Residual References to Non-Residual Places Required in Subclass MPEP 905.02 Recommended Specially Adapted References Must Classify in Instant or Pointed Place MPEP 905.02 Definition Must Reflect Classification Place MPEP 905.02 Permitted References Indicating Searchable Subject Matter Not Within Classification Scope MPEP 905.02 Definition of Appropriate Classification Places for Excluded Subject Matter MPEP 905.02 CPC Definitions Must Adhere to Same Template MPEP 905.02 Required Definition Title for Classification Place MPEP 905.02 Definition Must Match Classification Place Title MPEP 905.02 Other Related FA...