When can third parties access an international patent application?

Third parties cannot access an international patent application until the earliest of:

• The international publication date
• Date of receipt of the communication of the application under PCT Article 20
• Date of receipt of a copy of the application under PCT Article 22

This is specified in PCT Article 30(2)(a):

“No national Office shall allow access to the international application by third parties, unless requested or authorized by the applicant, before the earliest of the following dates: (i) date of the international publication of the international application, (ii) date of receipt of the communication of the international application under Article 20, (iii) date of receipt of a copy of the international application under Article 22.”