In Re Bilski

In re Bilski, 545 F.3d 943, 88 U.S.P.Q.2d 1385 (Fed. Cir. 2008), was an en banc decision of the United States Court of Appeals for the Federal Circuit (CAFC) on the patenting of method claims, particularly business methods. The Federal Circuit court affirmed the rejection of the patent claims involving a method of hedging risks in commodities trading. The court also reiterated the machine-or-transformation test as the applicable test for patent-eligible subject matter, and stated that the test in State Street Bank v. Signature Financial Group should no longer be relied upon.

The Supreme Court of the United States issued an opinion on appeal (as Bilski v. Kappos) that affirmed the judgment of the CAFC, but revised many aspects of the CAFC's decision. In their decision, handed down on June 28, 2010, the Supreme Court rejected the machine-or-transformation test as the sole test of process patent eligibility based on an interpretation of the language of § 101. The majority, however, had high praise for the Federal Circuit opinions, advising that "tudents of patent law would be well advised to study these scholarly opinions."