What is the purpose of the Written Opinion in the PCT process?

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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 Written Opinion serves multiple purposes in the Patent Cooperation Treaty (PCT) process, as outlined in MPEP 1845 : “The international search report and written opinion together serve to inform the International Preliminary Examining Authority of the documents and arguments necessary to complete the relevant assessments if international preliminary examination is demanded, and to inform the designated Offices of information that may be relevant to examination in the national phase.” Essentially, the Written Opinion provides a preliminary non-binding opinion on patentability, which helps guide further examination and informs national/regional patent offices during the national phase. Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Documents and Arguments for International Preliminary Examination MPEP 1845 Permitted International Search Report and Written Opinion Required for Demand MPEP 1864 International Search Report and Written Opinion Required MPEP 1801 International Preliminary Report on Patentability Transmitted MPEP 1845 Requirement for International Preliminary Examination MPEP 1845 Positive International Preliminary Examination Report Permitted MPEP 1845 Permitted ISA Must Establish Written Opinion on Novelty and Compliance MPEP 1845 Required Requirement for Written Opinion on Novelty and Inventive Step MPEP 1845 Required Reason for Lack of Unity from International Search Report MPEP 1845.01 Permitted 16 Months: International Search Report and Written Opinion MPEP 1801 Other Related FAQs 5 FAQs Collapse What is the purpose of Box No. I in the Written Opinion of the International Searching Authority? How does Box No. IV in the Written Opinion address ...