When does a withdrawal of a patent term extension application become effective?

A withdrawal of a patent term extension application becomes effective when it is acknowledged in writing by the USPTO. According to MPEP 2764:

“An express withdrawal pursuant to this section is effective when acknowledged in writing by the Office.”

This means that simply submitting a withdrawal request is not sufficient. The withdrawal only takes effect after the USPTO has reviewed your request and provided written confirmation of its acceptance.

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Topics: Adjustments, And Extensions, MPEP 2700 - Patent Terms, MPEP 2764 - Express Withdrawal Of Application For Extension Of Patent Term, Patent Law, Patent Procedure
Tags: patent term extension, USPTO procedure, Withdrawal Effectiveness