T.M.E.P. § 603.03
Applicant Has Duty to Maintain Current and Accurate Correspondence Address

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603.03 Applicant Has Duty to Maintain Current and Accurate Correspondence Address

It is the applicant's responsibility to maintain a current and accurate correspondence address in its application. If the correspondence address changes, the USPTO must be promptly notified in writing, preferably through TEAS. 37 C.F.R. 2.18. This also applies to e-mail addresses, if the applicant has authorized the Office to send correspondence by e-mail (see TMEP §304.03).