Amendments to an application which are supported in the original description are NOT considered new matter. The Manual of Patent Examining Procedure (MPEP) Section 2163.07 states: "Amendments to an application which are supported in the original description are NOT new matter." This means that changes to the application that are already described or implied in the original filing are permissible. However, adding completely new information that was not present or implied in the original application would be considered new matter. To learn more: new matter patent amendments original description MPEP 2163.07