Can a reexamination proceeding itself be involved in an interference?
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.
No, a reexamination proceeding itself cannot be involved in an interference proceeding. The MPEP clearly states: βAlthough a patent being reexamined via a reexamination proceeding may become involved in an interference proceeding, the reexamination proceeding itself can never be involved in an interference proceeding.β
This is based on the language of 35 U.S.C. 135(a), which specifies that interferences can only be declared between applications or between an application and an unexpired patent. The MPEP explains: βThe reexamination proceeding is neither an application nor a patent.β