An international application for a patent filed at the Patent Office as a competent receiving Office under the Patent Co-operation Treaty must F1be filed in English or Welsh.

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Where the Patent Office was acting on behalf of the International Bureau as the receiving Office, the comptroller shall only transmit an international application for a patent filed at the Patent Office to the International Bureau and the International Searching Authority after the appropriate fee has been paid.

A request under the Treaty for a certified copy of an international application for a patent (including any corrections to that application) filed at the Patent Office as the competent receiving Office must be filed on Patents Form 23.