How does the USPTO verify the authenticity of S-signatures?

This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.

The USPTO has specific methods to verify the authenticity of S-signatures:

1. Comparison with other documents: The USPTO may compare the S-signature with other signatures from the same person in their records.
2. Certification statement: MPEP 402.03 states: ‘The person inserting a permanent S-signature must present a statement certifying that the inserted signature is his or her own signature.’
3. Audit trail: Electronic filing systems may maintain an audit trail of who submitted the document.
4. Additional verification: In case of doubt, the USPTO may request additional verification or clarification.

While the USPTO generally presumes the authenticity of signatures, it’s crucial to ensure all S-signatures are genuine and properly certified to avoid potential legal issues.