Do you remember obviousness before KSR v. Teleflex? To invalidate, the rule went, one must find an express rationale for combining references (a teaching, suggestion or motivation). The KSR ruling reminded us that the TSM test was too rigid—the proper analysis should more flexibly evaluate obviousness with the skilled artisan in mind, without rigid requirements for these rationales in the references themselves.
If we knew how to more flexibly identify rationales for obviousness post-KSR, it was not clear how to more flexibly apply patent eligibility without the machine or transformation test after Bilski and Alice. A machine, apparently, was now just a clue. But identifying how to apply the more general principles from Alice and Bilski was not as easy to apply as a flexible obviousness test. The recent Core Wireless decision may show us a more useful theme for applying a more general approach to obviousness.