European Patent Convention
Article 172

(1)This Convention may be revised by a Conference of the Contracting States.

(2)The Conference shall be prepared and convened by the Administrative Council. The Conference shall not be validly constituted unless at least three-quarters of the Contracting States are represented at it. Adoption of the revised text shall require a majority of three-quarters of the Contracting States represented and voting at the Conference. Abstentions shall not be considered as votes.

(3)The revised text shall enter into force when it has been ratified or acceded to by the number of Contracting States specified by the Conference, and at the time specified by that Conference.

(4)Such States as have not ratified or acceded to the revised text of the Convention at the time of its entry into force shall cease to be parties to this Convention as from that time.

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