When does the fee for submitting an international application typically become due?

The fee for submitting an international application typically becomes due at the time the request for an international application is submitted. This aligns with the requirements set forth in the Patent Cooperation Treaty (PCT). When an applicant files an international application, they are required to pay the prescribed fees at the time of filing, which includes the International Filing Fee and any applicable fees for additional claims or pages.

Understanding this timing is crucial for applicants, as it sets the financial obligations in motion right from the start of the international application process. It ensures that the International Bureau of WIPO can begin processing the application immediately upon receipt, which is an essential part of the framework for international patent protection.

Other options reflect misconceptions about the timing and process. For instance, stating that the fee is due only after the International Searching Authority (ISA) review would suggest a misunderstanding of the immediate financial responsibilities associated with filing. Similarly, claiming that the fee is due with the filing of a national application confuses the timelines of national and international applications. Finally, suggesting that the fee can be submitted late without consequences overlooks the importance of timely submission in maintaining the validity of the application and adhering to international patent laws.