The Federal Circuit has now had enough opportunity to address Mayo’s “well-understood, routine, conventional” test that we should have a good understanding of it. We don’t (or at least I don’t).
To begin with, the Federal Circuit cases don’t seem to differentiate among these terms. The cases also universally connect the three terms with “and” rather than “or,” but curiously most of the cases don’t seem to actually require all three to be explicitly met for a determination of ineligibility. See, e.g., Content Extraction, where the Federal Circuit noted only that the patent owner had conceded one function as being “routine.” Finally, there seems to be real disagreement about the extent to which these terms address facts as opposed to legal standards. In this post, I’m not going to comprehensively analyze all these issues, but instead will focus primarily on what these common terms mean.