What are the facts?
Bernard Bilski and Rand Warsaw sought a patent claiming methods of hedging risk in the energy commodities market. Their principal claim recited a series of steps for managing consumption risk costs for a commodity sold at a fixed price, essentially instructing market participants (e.g., a commodity provider and counterparties) to enter into transactions that offset price fluctuations. The claims neither recited a particular machine nor required transformation of an article; they were drafted at a high level of generality and were not tied to any specific computer implementation. The patent examiner rejected the application under 35 U.S.C. § 101 for claiming non-statutory subject matter. The Board of Patent Appeals and Interferences affirmed. On en banc review, the Federal Circuit affirmed in In re Bilski, 545 F.3d 943 (Fed. Cir. 2008), adopting the machine-or-transformation (MoT) test as the exclusive test for process patent eligibility, under which a process must be tied to a particular machine or transform a particular article to be patent-eligible. The Supreme Court granted certiorari to resolve whether the MoT test was the exclusive criterion and whether Bilski's claims were patent-eligible.
What is the legal issue?
Are Bilski's claims to a method of hedging risk patent-eligible under 35 U.S.C. § 101, and is the machine-or-transformation test the exclusive test for determining the patent eligibility of a process?
What rule applies?
Under 35 U.S.C. § 101, patentable subject matter includes any new and useful process, machine, manufacture, or composition of matter, and improvements thereof. Judicially created exceptions exclude laws of nature, natural phenomena, and abstract ideas from patent eligibility. The machine-or-transformation test may be a useful and important clue or investigative tool for determining process eligibility, but it is not the exclusive or dispositive test. Business methods are not categorically excluded from § 101; however, claims directed to abstract ideas are not patentable, and field-of-use limitations or token post-solution activity do not render an abstract idea patent-eligible.
What did the court hold?
The Supreme Court affirmed the denial of Bilski's patent. The machine-or-transformation test is not the sole test for process patent eligibility under § 101, but Bilski's hedging claims are unpatentable because they are directed to an abstract idea.
What is the reasoning?
The Court began with the text of § 101, emphasizing its broad language covering "any new and useful process." It rejected the Federal Circuit's imposition of the machine-or-transformation test as the exclusive test, explaining that while MoT is a significant clue grounded in precedent (Benson, Flook, and Diehr), the statute's breadth and technological evolution counsel against limiting process eligibility to that single criterion. The Court also declined to adopt a categorical exclusion for business methods, noting that Congress's enactment of 35 U.S.C. § 273 (which provides a prior-use defense for business method patents) presupposes that at least some business method inventions may be patent-eligible, and the statute contains no express business-method carveout. Turning to the specific claims, the Court concluded that Bilski's risk-hedging method is an abstract idea akin to a fundamental economic practice long prevalent in commerce. Allowing a patent would preempt the use of this basic concept, contravening the principle that abstract ideas are not patentable. The claims lacked any meaningful machine tie-in or transformation and were framed at a high level of abstraction, with mere instructions to apply an idea in a particular field. The Court cited prior cases to emphasize that limiting an abstract idea to a particular technological environment or adding insignificant post-solution activity does not confer patent eligibility. While rejecting MoT as the exclusive test, the Court approved its use as a helpful investigative tool and declined to define "abstract idea" exhaustively, leaving further development to lower courts. Concurring opinions underscored key points: Justice Stevens (joined by three Justices) would have categorically excluded business methods; Justice Breyer (joined in part by Justice Scalia) emphasized that State Street's "useful, concrete, and tangible result" test is not the law and that MoT remains a useful clue, not a mandatory standard.
Why is this case significant?
Bilski recalibrated the § 101 analysis by preventing the machine-or-transformation test from ossifying into a rigid rule, yet preserved the core judicial exception that abstract ideas are not patentable. It refused to categorically ban business method patents, signaling that eligibility turns on whether claims do more than monopolize fundamental principles. The decision set the stage for Mayo and Alice, which transformed Bilski's guidance into the modern two-step eligibility framework. For law students, Bilski is essential to understand the evolution of patent-eligibility doctrine, the role of preemption and judicial exceptions, and the interplay between statutory text and common-law limits.
Did Bilski hold that business methods are never patentable?
No. The Court expressly declined to categorically exclude business methods from § 101. It pointed to § 273's prior-use defense as evidence that Congress contemplated the existence of business method patents. However, many business method claims will fail if they merely recite abstract ideas without additional features that confer eligibility.
What happened to the machine-or-transformation test after Bilski?
The test survived as a useful and important clue but is no longer the exclusive test for process eligibility. Courts may consider whether a claim is tied to a particular machine or transforms an article, but they must also assess whether the claim is directed to a judicial exception (e.g., an abstract idea) and whether it includes additional elements that make it patent-eligible.
Did Bilski decide the fate of software patents?
No. Bilski did not categorically approve or disapprove software patents. It addressed a method of hedging risk and cautioned against rigid rules. Later cases—Mayo v. Prometheus and Alice v. CLS Bank—supplied the two-step framework that is now applied to software and computer-implemented inventions, focusing on whether claims are directed to an abstract idea and whether they include an "inventive concept."
How does Bilski relate to Alice?
Bilski laid groundwork by rejecting the exclusive MoT test and reaffirming the abstract-idea exception. Alice built on Bilski (and Mayo), formalizing the two-step test: first, determine if the claim is directed to an abstract idea; second, assess whether additional elements transform the claim into a patent-eligible application (an "inventive concept"). Alice applied that framework to invalidate computer-implemented intermediated settlement claims.
What key precedents did Bilski rely on?
The Court drew on Gottschalk v. Benson (algorithm for binary conversion—unpatentable abstract idea), Parker v. Flook (updating alarm limits—abstract idea with no inventive application), and Diamond v. Diehr (rubber-curing process—eligible because it applied a formula in a transformative industrial process). These cases underscore that abstract ideas cannot be patented, but practical applications may be.