1. In patent revocation proceedings it is not inadmissible for a party to join as an intervener for the plaintiff in the appeal instance on grounds that the intervening party is raising a further nullity claim against the patent on which the patent court has not yet decided. 2. Whether a reasonable expectation of success is given for trying a route to solving a problem must be determined in each individual case taking into consideration the field in question, the strength of the incentive for the person skilled in the art, the necessary effort for trying and pursuing a certain approach and the possible alternatives, as well as their advantages and disadvantages (confirmation of Federal Supreme Court, decision of 16 April 2019 - X ZR 59/17, GRUR 2019, 1032 - Fulvestrant).
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机译：1.在专利撤销诉讼程序中，缔约方不会因上诉实例中的原告作为讨论者而受理，因为中期方正在对专利法院尚未决定的专利提出进一步的无效索赔。 2.在尝试解决问题的情况下是否有合理的成功期望，必须在每个案例中确定有问题的领域，这是本领域技术人员的激励的力量，这是必要的努力尝试并追求某种方法和可能的替代方案，以及他们的优缺点（确认联邦最高法院，2019年4月16日的决定 - X ZR 59/17，Grur 2019,1032 - 乌斯利特）。
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