304.07 Signature of Electronic Mail
An applicant, registrant or attorney may sign an e-mail communication by entering a "symbol" that he or she has adopted as a signature between two slashes. See 37 C.F.R. §§2.33(d) and 2.193(c)(1)(iii)(A) and TMEP §804.05 regarding signature of electronically-filed documents.
In addition, the USPTO will accept an e-mail communication containing the "/s/" ("/(signature)/") notation in lieu of a signature.
A scanned image of a document signed in ink is also acceptable, as long as the image is attached in .jpg format.
(1) The correspondence has been read by the applicant, registrant or attorney;
(2) The filing of the correspondence is authorized;
(3) To the best of the signatory's knowledge, information, and belief, there is good ground to support the correspondence; and(4) The correspondence is not presented for purposes of delay.