How can claims be amended in a PCT application?

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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. Claims in a PCT application can be amended at various stages, as described in MPEP 1824 : During the international phase under PCT Article 19 after receiving the international search report During international preliminary examination if the applicant has filed a Demand During the national phase The MPEP states: “ The claims can be amended during the international phase under PCT Article 19 on receipt of the international search report, during international preliminary examination if the applicant has filed a Demand, and during the national phase. “ When amending claims, applicants must follow the procedures outlined in PCT Administrative Instructions Section 205 , which includes indicating the differences between the original and amended claims. Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Numbering of Amended Claims Must Follow Administrative Instructions MPEP 1824 Required Division of Previously Amended Claim Required MPEP 1824 Amendments During PCT Process Permitted MPEP 1824 Permitted Claims Must Follow Technical Features with Reference Signs MPEP 1824 Required Rectify Claims Only If Affecting International Search MPEP 1824 Recommended Amendments to Claims Permitted MPEP 1824 Permitted Claims Must Define Invention MPEP 1824 Required Claims Must Define Protected Invention MPEP 1824 Required Claims Must Be Clear and Concise MPEP 1824 Required Claims Must Be Supported By Description MPEP 1824 Required Other Related FAQs 5 FAQs Collapse How should claims be numbered in a PCT application? Can claims in a PCT application refer to the description or drawings? What are the main requirements for claims in a PCT application? What is the recommended structure for c...