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The European Patent Convention

 
 

Article 118
Unity of the European patent application or European patent

Where the applicants for or proprietors of a European patent are not the same in respect of different designated Contracting States, they shall be regarded as joint applicants or proprietors for the purposes of proceedings before the European Patent Office. The unity of the application or patent in these proceedings shall not be affected; in particular the text of the application or patent shall be uniform for all designated Contracting States, unless this Convention provides otherwise. 
References

Art. 59, 99
R. 18, 78, 138