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Trademark owners should consider low cost Letters of Protest an important part of their U.S. trademark enforcement programs. In certain circumstances, the United States Patent and Trademark Office (USPTO) allows interested parties to prevent the registration of another’s pending trademark application with a “Letter of Protest.” A Letter of Protest may be submitted during the ex parte trademark examination procedure thereby potentially avoiding the need for a formal, contentious, and costly opposition proceeding. Through the Letter of Protest procedure, interested parties can bring information that is relevant to the registrability of another’s mark but that may otherwise be overlooked, to the USPTO’s attention without violating the ex parte nature of the trademark examination procedure.