The unforgiving gold standard: Why deleting a feature can add matter at the EPO (T 0422/23)

In the EPO gold standard test for added matter, what is deleted can be just as problematic as what is added. The unforgiving gold standard test for added matter requires that any amendment, including the deletion of a feature, must be directly and unambiguously derivable from the original application. The Board of Appeal in the recent decision of T 0422/23 rejected the Opposition