The Trademark Assistance Center (TAC) is the main support center for all customers, from first-time filers to legal professionals and experienced trademark applicants. Although TAC may not give legal advice, it can answer general questions about the trademark process and our Trademark Electronic Application System (TEAS) forms. TAC is available for telephone and email inquiries Monday–Friday, 8:30 a.m. to 8 p.m. ET (except federal holidays). 1-800-786-9199 (press 1)