1. The Vienna Convention on the Law of Treaties

In G 5/83 (OJ 1985, 64) the Enlarged Board stated that the provisions of the Vienna Convention do not apply to the European Patent Convention ex lege, since the former Convention applies only to treaties which are concluded by States after the entry into force of the Vienna Convention with regard to such States (Art. 4, Vienna Convention). At the time of conclusion of the European Patent Convention, the Vienna Convention was not in force. Nevertheless, there were convincing precedents for applying the rules for interpretation of treaties incorporated in the Vienna Convention to a treaty to which in terms they do not apply. The International Court of Justice did already apply principles expressed in the Vienna Convention to situations to which the Convention strictly did not apply, whilst the European Court of Human Rights, the Federal German Constitutional Court and the House of Lords (England) have also applied the principles of interpretation in Arts. 31 and 32 of the Convention to treaties to which strictly they do not apply. After a careful study of the whole subject, the Enlarged Board of Appeal concluded that the European Patent Office had to do the same.

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