What document is required to support the assignments when filing a corrective assignment?

A corrective assignment must be supported by an underlying document that clearly outlines the original assignment agreement. This document is crucial because it provides verification of the transfer of rights and ownership from one party to another. By presenting the underlying document, it ensures that the USPTO has a clear understanding of the intent and details surrounding the ownership change.

The need for an underlying document is tied directly to the integrity of the trademark registration process, as it safeguards against potential disputes regarding ownership. The other options—such as a business license, power of attorney, or trademark registration certificate—do not meet the specific requirement of corroborating the assignment itself. A business license is typically unrelated to trademark ownership, a power of attorney relates to granting authority but does not pertain directly to assignments, and a trademark registration certificate verifies the registration status of a mark rather than supporting an assignment. Thus, the correct response focuses precisely on the necessity of the underlying document in the context of filing a corrective assignment.