In what scenario does withdrawal from a patent case become effective?

The correct answer indicates that withdrawal from a patent case becomes effective only after it has received approval from the relevant authority, in this case, the commissioner director. This reflects the formal nature of legal proceedings, where a procedural step such as withdrawal is not simply a matter of notification.

The requirement for approval ensures that there is oversight and that the withdrawal does not compromise the rights of the client or the integrity of the legal process. This safeguards against any unauthorized or arbitrary actions on the part of the attorney and reinforces the structured nature of patent proceedings.

The other scenarios presented might imply an immediacy or personal discretion facet that does not align with established protocols in patent law. Withdrawing from a case involves procedural criteria that go beyond mere agreement or personal decision, making the approval of a higher authority essential for ensuring proper conduct and adherence to legal standards.