Does an assignment automatically revoke a previous power of attorney in patent cases?

No, an assignment does not automatically revoke a previous power of attorney in patent cases. The MPEP 2560 clearly states: “It should be noted that an assignment does not act as a revocation of power of attorney for authorization previously given.” This means that even if the ownership of a patent or patent application changes, the existing power of attorney remains in effect unless explicitly revoked.

However, the section also notes that “the assignee may revoke a previous power of attorney.” This indicates that while the assignment itself doesn’t revoke the power of attorney, the new assignee has the authority to do so if they choose.

To learn more:

• Power of Attorney
• Patent Assignment
• USPTO Procedures