| 21. | The European Convention works on the principle of the mutual recognition and enforcement of orders made in contracting states.
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| 22. | The contracting states, the states which are parties to the PCT, constitute the "'International Patent Cooperation Union " '.
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| 23. | A requester may request to restrict the claims with respect to one or more, but not all, Contracting States.
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| 24. | A translation of a granted European patent must be filed in some EPC Contracting States to avoid loss of right.
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| 25. | Provision may also be made in such agreements for bringing them under the jurisdiction of one of the contracting States.
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| 26. | The treaty required that all four contracting states strike freely exchangeable gold coins and silver coins according to common specifications.
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| 27. | A European patent is also non-unitary in that it may be revoked in one Contracting State while maintained in another.
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| 28. | In other Contracting States, no translation needs to be filed, for example in Ireland if the European patent is in English.
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| 29. | The Patent Cooperation Treaty provides a unified procedure for filing patent applications to protect inventions in each of its contracting states.
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| 30. | Applicants from any contracting state may file a PCT application at the International Bureau in Geneva, subject to national security provisions.
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