601 Applicant May Be Represented by Attorney at Law 601.01 USPTO Cannot Aid in Selection of Attorney 601.02 Communications With Applicant Who Is Represented By Attorney 602 Persons Who May Practice Before Office in Trademark Matters 602.01 Powers of Attorney 602.01(a) Power of Attorney Relating to More Than One Application or Registration 602.01(b) Associate Powers of Attorney 602.01(c) Powers of Attorney Filed After Registration 602.02 Standards of Conduct 602.03 Actions by Unauthorized Persons Not Permitted 602.04 Revocation of Power of Attorney 602.05 Withdrawal of Attorney of Record