What is the difference between an ‘original’ and a ‘substitute’ 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.

According to MPEP 201.02, there are important distinctions between ‘original’ and ‘substitute’ applications:

Original Application: This term is used in patent statutes and rules to refer to an application that is not a reissue application. An original application can be either a first filing or a continuing application.

Substitute Application: The MPEP defines a substitute application as follows:

A “substitute” application is in essence the duplicate of an application by the same applicant abandoned before the filing of the later application. […] A substitute application does not obtain the benefit of the filing date of the prior application.

The key difference is that a substitute application does not retain the filing date of the prior application, unlike certain types of continuing applications.

For more information on patent filing, visit: patent filing.

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