What is the effect of a continuation-in-part application on patent term?

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.

A continuation-in-part (CIP) application can have a significant impact on patent term. According to the MPEP 201.08:

The term of a patent issuing from a continuation-in-part application may be barred or limited by any prior applications or patents from which benefit is claimed.

This means that:

• The patent term for subject matter carried over from the parent application is calculated from the filing date of the parent application.
• The patent term for new subject matter introduced in the CIP is calculated from the filing date of the CIP application.
• This can result in different expiration dates for different claims within the same patent.

It’s crucial for inventors and patent practitioners to carefully consider the timing and content of CIP applications to maximize patent protection and term.

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