What signifies that a trademark assignment has been legally completed?

The completion of a trademark assignment is indicated by filing the necessary paperwork with the United States Patent and Trademark Office (USPTO). This process involves submitting the assignment document that details the transfer of ownership from one party to another.

When this paperwork is filed and processed by the USPTO, it becomes part of the official trademark registry, confirming the new ownership in a public database. This legal recognition is crucial, as it prevents issues regarding rights and ownership in the future.

Other methods, such as public announcements or informal notifications from marketing agencies, do not provide legal standing or acknowledgment of the assignment. Similarly, while informing previous trademark owners may be part of the process, it does not fulfill the legal requirement necessary for the assignment to be recognized by the USPTO. Therefore, the filing of the proper documentation is the definitive action that solidifies the legality of the trademark assignment.