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English: The timeline develops from left to right along a horizontal line and contains 3 main stages as follows.

Stage 1. First Filing. This stage includes 1 key event as follows.

  • Application filed with national or regional patent office. This constitutes the priority date.

Stage 2. The P C T international phase. This stage includes 8 key events as follows.

  • P C T filing occurs 12 months after first filing.
  • Transmittal of international search report and written opinion occurs 16 months after first filing.
  • At around 18 months, Article 19 amendments are optional.
  • International publication occurs 18 months after first filing.
  • At 22 months after first filing, supplementary international search request is optional.
  • At 22 months after first filing, international preliminary examination demand is optional.
  • At 28 months after first filing, a supplementary international search report is processed, if requested.
   At 28 months after first filing, an international preliminary report on patentability, Chapter 2, is processed, if requested.

Stage 3. The P C T national phase. This stage includes 4 key events as follows.

  • Communication by the International Bureau to national or regional offices.
  • Application enters national phase before selected patent of­fices. National or regional search and examination takes place. 3 examples are provided as follows.
  • To visualize the process, Country A, Country B, and Country C are shown on parallel , horizontal timelines on the P C T process. Country B is slightly ahead in the process, followed by Country A and then Country C. Each application is subject to grant or refusal by national or regional offices.

A list of the 4 main benefits of the P C T System reads as follows.

  • One P C T application with legal effect in all P C T Contracting States.
  • Harmonized formal requirements.
  • Receive patentability information to support strategic decision-making.
  • Postpone signifi­cant costs for national processing by 18 months.
Date
Source https://www.wipo.int/publications/en/details.jsp?id=4548&plang=EN
Author WIPO

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