What are the requirements for signatures on USPTO correspondence?

The USPTO accepts different types of signatures on correspondence, including:

1. Handwritten signatures: Original signatures in permanent dark ink or equivalent.
2. S-signatures: A signature inserted between forward slash marks, which can be used for correspondence filed in paper, by fax, or via the electronic filing system.
3. Electronic signatures: For correspondence submitted via the electronic filing system, a graphic representation of a handwritten signature or an S-signature is acceptable.

According to 37 CFR 1.4(d): Each piece of correspondence, except as provided in paragraphs (d)(2), (d)(3), (d)(4), (e) and (f) of this section, filed in an application, patent file, or other proceeding in the Office which requires a person’s signature, must: (i) Be an original, that is, have an original handwritten signature personally signed, in permanent dark ink or its equivalent, by that person; or (ii) Be a direct or indirect copy, such as a photocopy or facsimile transmission (§ 1.6(d)), of an original.

For S-signatures, the signer must personally insert their own signature, and patent practitioners must include their registration number. The signer’s name must be presented in printed or typed form immediately below or adjacent to the S-signature.

To learn more:

• USPTO signatures
• handwritten signature
• S-signature
• electronic signature