Substitute Patent Application

an application which is in essence a duplicate of a prior (earlier filed) application by the same applicant abandoned before the filing of the substitute (later filed) application; a substitute application does not obtain the benefit of the filing date of the prior application

-- see MPEP 201.09 for more

A patent application that is a duplicate of an earlier application by the same applicant abandoned before the filing of the later application. MPEP 201.09.