What is the process for obtaining pre-1957 patent assignment records?

Obtaining patent assignment records from before May 1, 1957, involves a different process than accessing more recent records. According to MPEP 301.01:

All records of assignments of patents recorded before May 1, 1957, are maintained by the National Archives and Records Administration (NARA). The records are open to public inspection. Certified and uncertified copies of those assignment records are provided by NARA upon request and payment of the fees required by NARA.

The MPEP further advises:

Requests for copies of pre-1957 records for patents should be directed to the National Archives and Records Administration (NARA). Since these records are maintained by NARA, it is more expeditious to request copies directly from NARA, rather than from the Office, which would then have to route the requests to NARA.

To obtain these records:

1. Contact NARA directly.
2. Provide as much information as possible about the patent and assignment you’re seeking.
3. Be prepared to pay the fees required by NARA.

The MPEP also notes: All assignment records from 1837 to April 30, 1957 for patents are now maintained and are open for public inspection in the National Archives Research Room located at the Washington National Records Center Building, 4205 Suitland Road, Suitland, Maryland 20746 and at the Civilian Records Division of the National Archives at College Park, 8601 Adelphi Road, College Park, MD 20740-6001.

For the most up-to-date information on accessing these records, it’s recommended to check the National Archives website.

For more information on NARA, visit: NARA.