What is the time limit for claiming benefit of a prior application?

This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.

The time limit for claiming benefit of a prior application depends on the type of application:

• For utility or plant applications filed under 35 U.S.C. 111(a), the benefit claim must be made within the later of:
  • Four months from the actual filing date of the later-filed application, or
  • Sixteen months from the filing date of the prior-filed application
• For nonprovisional applications entering the national stage from an international application under 35 U.S.C. 371, the benefit claim must be made within the later of:
  • Four months from the date on which the national stage commenced
  • Four months from the date of the initial submission to enter the national stage
  • Sixteen months from the filing date of the prior application

As stated in the MPEP: “This time period is not extendable and a failure to submit the reference required by 35 U.S.C. 119(e) and/or 120, where applicable, within this time period is considered a waiver of any benefit of such prior application(s) under 35 U.S.C. 119(e), 120, 121, 365(c), and 386(c) unless a petition to accept an unintentionally delayed benefit claim is granted.”

For more information on 35 U.S.C. 111(a), visit: 35 U.S.C. 111(a).

For more information on 35 U.S.C. 371, visit: 35 U.S.C. 371.

For more information on time limit, visit: time limit.