Which of the following is a requirement for changes to inventorship in Non-Provisional applications?

In the context of changes to inventorship in Non-Provisional applications, the requirement for an inventor's oath or declaration is critical. This document serves as a formal statement by each inventor affirming their status as an inventor of the claimed subject matter, which is crucial when there is any change in the named inventors. The oath or declaration must be executed by the newly added inventors to ensure they acknowledge their contribution to the invention and understand their responsibilities as inventors.

When there’s a change in inventorship, it confirms to the United States Patent and Trademark Office (USPTO) that the appropriate individuals are officially recognized as inventors on the application. This process maintains the integrity of the patent system by ensuring that all individuals who contributed to the invention are legally acknowledged and adhere to the duties associated with inventorship.

Other options involve aspects that do not address the necessity of formal acknowledgment through an oath or declaration. While written agreements from original inventors might be useful in certain contexts, they are not an official requirement for changing inventorship. Proof of invention funding and the payment of additional application fees are administrative issues that are not directly related to the legal recognition of inventorship changes. Thus, the necessity for an inventor's oath or declaration stands out as the