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The United States Patent and Trademark Office, Trademark Trial and Appeal Board (TTAB), is taking this action to revise the Trademark Rules of Practice (37 CFR part 2) to set forth requirements for service of notices of opposition to applications for trademark registration and of petitions to cancel trademark registrations. The purpose of these service rules is to codify and clarify current practice. This action would also codify and revise certain rules by which parties in opposition, cancellation, and concurrent use proceedings (inter partes proceedings) before the TTAB can make of record various types of materials as evidence. Further, this action will revise and clarify rules specifying what materials are automatically of record as evidence in inter partes and therefore need not be made of record by any party to a proceeding.