Can new matter be introduced when correcting patent application drawings?

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, new matter cannot be introduced when correcting patent application drawings. The MPEP 608.02(p) clearly states:

No amendment may introduce new matter into the disclosure of an application.

This prohibition is based on 35 U.S.C. 132(a), which specifies:

No amendment shall introduce new matter into the disclosure of the invention.

When correcting drawings, applicants must ensure that all changes are supported by the original disclosure. Any correction that adds new information not previously disclosed in the application would be considered new matter and is not permitted. This rule helps maintain the integrity of the patent application and ensures that the scope of the invention remains consistent with the original filing.