What is an inadvertently issued registration number (IIRN)?

An inadvertently issued registration number (IIRN) refers specifically to a number assigned to a registration that should not have been issued due to an error. This situation typically arises when there are mistakes or oversights in the application or examination process, resulting in the USPTO granting a registration that doesn't comply with the necessary requirements.

The importance of recognizing an IIRN lies in its potential implications for trademark rights. If a registration number is issued in error, it can create confusion regarding trademark rights and may even lead to wrongful assertions of ownership or exclusivity over a mark. Therefore, understanding the nature of IIRNs helps trademark practitioners recognize that not all registration numbers reflect valid or enforceable rights and that corrective actions may be needed to address such errors.

In contrast, the choices about correct registration numbers or pending applications do not accurately describe the specific circumstances of an IIRN, as they involve legitimate registrations or standard procedural elements without mistakes.