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The European Patent Convention


Article 105[ 111 ], [ 112 ]
Intervention of the assumed infringer

Any third party may, in accordance with the Implementing Regulations, intervene in opposition proceedings after the opposition period has expired, if the third party proves that  
proceedings for infringement of the same patent have been instituted against him, or 
following a request of the proprietor of the patent to cease alleged infringement, the third party has instituted proceedings for a ruling that he is not infringing the patent. 
An admissible intervention shall be treated as an opposition. 
Amended by the Act revising the European Patent Convention of 29.11.2000. 
See decisions of the Enlarged Board of Appeal G 4/91, G 1/94, G 2/04, G 3/04, G 1/05 (Annex I).

Art. 99
R. 3, 76-86, 89, 112, 114