What does a registration number signify in trademark applications?

A registration number signifies a unique identifier assigned specifically to a registered trademark. This number is crucial because it serves to uniquely identify the trademark in the records of the United States Patent and Trademark Office (USPTO) and provides an official recognition of the trademark's registration. When a trademark is registered, the owner can refer to this registration number when managing, protecting, or enforcing their trademark rights.

Having a registration number indicates that the trademark has gone through the necessary examination and approval processes, confirming its registrability under U.S. trademark law. This distinctive identification helps prevent confusion with other trademarks and provides legal benefits, such as presumption of ownership and exclusive rights to use the mark in commerce.

In contrast, other options do not accurately describe the purpose of a registration number. For instance, a unique number assigned to an active trademark application refers to a serial number, not a registration number. Similarly, a temporary number does not capture the permanence associated with a registered trademark, and a reference number for disputes doesn’t provide the official protection or identification that a registration number does.