Welsh IP Law initially sought to resolve the matter by seeking a coexistence agreement with the Jenkins Clinic. This approach made sense considering the differences in the services provided by the parties, namely neurology versus urology. The parties could not reach an agreement. Welsh IP Law then filed a petition with the TTAB to cancel the JENKINS CLINIC registrations. A cancellation petition initiates an administrative proceeding that allows a third party to challenge to the validity of a trademark registration. Cancellation proceedings can be effective when a senior trademark registration is blocking a later filed application and there are valid reasons to cancel or limit the registration. The Complaint filed by Welsh IP LAW sought cancellation of the JENKINS CLINIC registrations based on: (1) junior use, (2) trademark mutilation, (3) trademark abandonment, and (4) lack of interstate use.