Is the address of the assignee required in patent assignment documents?
While the address of the assignee may be included in the assignment document, it is not strictly required there. However, the address must be provided in the cover sheet accompanying the assignment. As stated in MPEP 302.05:
The address of the assignee may be recited in the assignment document and must be given in the required cover sheet.
This means that while including the address in the assignment document itself is optional, providing it on the cover sheet is mandatory for proper recordation of the assignment.
To learn more:
Topics:
MPEP 300 - Ownership and Assignment,
Patent Law,
Patent Procedure