What must be submitted to enter the national phase in the U.S. from a PCT application?

To enter the national phase in the United States from a PCT (Patent Cooperation Treaty) application, it is essential to submit a few important components outlined by the USPTO regulations. The correct choice specifies the requirement of a filing fee, a copy of the international application, and an oath or declaration.

When transitioning to the national phase, the fee is necessary to process the application by the USPTO. Additionally, submitting a copy of the international application ensures that the agency has the necessary documentation to evaluate the claims and inventions presented in the original submission. The oath or declaration affirms the applicant's belief in the truth of the claims being made, an essential step to meet the legal requirements of the U.S. patent application process.

This combination of the filing fee, the complete international application, and the oath fulfills the regulatory obligations for entering the national phase under U.S. patent law. Each component plays a critical role in ensuring the application is valid and formally recognized by the USPTO.