How are historical patent assignment records maintained?

How are historical patent assignment records maintained?

The USPTO maintains historical patent assignment records separately from more recent records. MPEP 301.01 explains:

‘The historical database of assignments is maintained separate and apart from the database of assignments affecting title recorded since 1980.’

This means that:

• Records prior to August 1980 are kept in a separate historical database
• These older records may not be available through the online Patent Assignment Search
• Accessing historical records may require different procedures or direct contact with the USPTO

For researchers or legal professionals needing access to pre-1980 assignment records, it’s advisable to contact the USPTO’s Patent and Trademark Resource Centers or the Assignment Recordation Branch for assistance.