How do I properly use a certificate of mailing for patent correspondence?

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.

To properly use a certificate of mailing for patent correspondence, follow these steps:

1. Prepare your correspondence.
2. Attach a certificate of mailing to each piece of correspondence.
3. Include the required information on the certificate.
4. Sign and date the certificate.
5. Mail the correspondence with the attached certificate.

According to MPEP 512:

Each piece of correspondence for which a certificate is filed must include a signed and dated certificate which sets forth the date of deposit or transmission.

Ensure that you follow these guidelines to properly use the certificate of mailing procedure.