The registration is valid as long as you timely file all post registration maintenance documents. You must file a “Declaration of Use under Section 8” between the fifth and sixth year following registration. In addition, you must file a combined “Declaration of Use and Application for Renewal under Sections 8 and 9” between the ninth and tenth year after registration, and every 10 years thereafter. For more information see Maintain/Renew a Registration.
For more information, see here: https://www.uspto.gov/trademark
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