How are application numbers assigned for PCT applications entering the national stage?

For PCT applications entering the national stage in the United States, the application number assignment process is slightly different. The MPEP states:

‘For PCT applications entering the national stage under 35 U.S.C. 371, the USPTO assigns the national stage application a U.S. application number.’

This means that when an international PCT application transitions to the national stage in the U.S., it receives a new U.S. application number distinct from its international application number. This U.S. application number is used for all subsequent processing and correspondence related to the national stage application.

It’s important to note that this U.S. application number is different from the international application number (PCT/XX/YYYY/######) that was used during the international phase of the PCT application.

For more information on application number, visit: application number.