NOTE: Once you file an express abandonment, it cannot be withdrawn except in an extraordinary situation upon petition to the Director. To withdraw from issue a utility or plant application, an applicant may wish to file a petition under 37 CFR 1.313(c)(2) with a RCE or under 37 CFR 1.313(c)(3)Enter the serial number of the trademark application you previously filed. Complete the online abandonment application and submit. This petition can be filed as an ePetition. § 2.68 Express abandonment (withdrawal) of application. An attorney may withdraw from representing an applicant or registrant, but may not withdraw in a way that would prejudice the applicant or registrant. Working in the United States. Most Canadian business travellers may apply for admission at a U.S. port of entry without first obtaining a non-immigrant visa. Understanding trademark classes and their importance and conducting an efficient trademark category analysis is crucial for successful trademark registration.