What is the primary search tool used by patent examiners for classified searching?

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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. The primary search tool used by patent examiners for classified searching is the Cooperative Patent Classification (CPC) system. According to MPEP 904.02(a) : “The primary classification search tool is the Cooperative Patent Classification (CPC) system.” The CPC system is a collaborative effort between the USPTO and the European Patent Office (EPO) to provide a harmonized patent classification system. Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Examiner Must Consult Other Examiners for Unfamiliar Subject Matter MPEP 904.02(a) Recommended Examiner Must Note All Classification Locations Pertinent to Invention MPEP 904.02(a) Recommended Parent Applications Must Be Reviewed for Prior Art MPEP 904 Required Examiner Must Consider Prior Art from Parent Application MPEP 904 Required Review of Cited Prior Art from Parent Application Required MPEP 904 Recommended Examiner Must Review File Wrapper History and PTAB Post-Grant Proceedings MPEP 904 Required Documents Cited in International Search Report Must Be Considered MPEP 904 First Search Should Cover Invention as Claimed MPEP 904 Recommended Examiner’s First Office Action Relies on Initial Search References MPEP 904 Examiner Must Complete Search Notes Form MPEP 904 Required Other Related FAQs 5 FAQs Collapse What additional classification systems should patent examiners consider besides CPC? How should patent examiners approach classification searching? What classification systems are used in patent searches? What is a classified search in patent examination? How is the field of search documented in patent examination?