[Patentpractice] What are our obligations to keep an applicant / assignee address current in the USPTO?

[Patent Lawyer]

The assignee and applicant for a US application is a German entity (GmbH).

The assignment was recorded when the application was filed.  The assignee has moved to different addresses a few times since the application was filed. Twice within the same German city and once to another German city.  Their name and corporate status have not changed, just the address.  I.e., it is the same legal entity, just at a different address.

What are our obligations to keep an applicant's address current in the USPTO?
What are our obligations to keep an assignee’s address current in the USPTO?

Thanks in advance
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