Some Patent and Trademark Depository Libraries (PTDLs) participate as authorized agents for the USPTO in accepting documents filed under the Disclosure Document Program. This service provides a completed transaction on-site at the PTDL. Documents receive an identifying number and date at the time of receipt by the PTDL. Originial documents are sent to the USPTO for processing and retention.

A list of PTDL libraries can be found in the Official Gazette and on the USPTO Web site. Collections of patents and patent-related reference materials are available at the nationwide network of PTDLs. Contact the PTDL prior to your visit to learn about its collections, services, and hours.