Article 23

1. [Reservation] Any State or intergovernmental organization may declare through a reservation that the provisions of Article 6(1) shall not apply to any requirement relating to unity of invention applicable under the Patent Cooperation Treaty to an international application.

2. [Modalities] Any reservation under paragraph 1 shall be made in a declaration accompanying the instrument of ratification of, or accession to, this Treaty of the State or intergovernmental organization making the reservation.

3. [Withdrawal] Any reservation under paragraph 1 may be withdrawn at any time.

4. [Prohibition of Other Reservations] No reservation to this Treaty other than the reservation allowed under paragraph 1 shall be permitted.