Bilski v. Kappos
The Court ruled that the energy-hedging technique at issue could not be patented because it was really just an abstract idea dressed up as a process — the basic concept of hedging risk, plus a formula, is not the kind of invention patent law protects.
Along the way, the Court rejected the lower court's rule that a process must be tied to a machine or physically transform something to count as patentable, and it declined to say business methods can never be patented, leaving the door open — but only a crack — for future business-method patent claims.
How it got here: A patent examiner and the Board of Patent Appeals rejected the application; the Federal Circuit, sitting en banc, affirmed using a new test, and the applicants sought Supreme Court review.
The Case in Depth
What happened
Bernard Bilski and Rand Warsaw sought a patent on a method for commodities buyers and sellers, especially in the energy market, to hedge against price swings by matching consumers on fixed rates with counter-risk market participants. Their application included a version of the method reduced to a mathematical formula and variations applying it to energy markets, using weather and statistical data to help set the numbers.
The question before the Court
Could two inventors patent a way of hedging against price swings in the energy market, even though their method wasn't tied to any machine and didn't transform anything physical?
The Court's answer
No — the Court ruled that Bilski and Warsaw's hedging method could not be patented, because it amounted to an unpatentable abstract idea rather than a genuine invention. At the same time, the Court rejected the Federal Circuit's rule that a process must be tied to a machine or physically transform something to qualify for a patent, calling that requirement useful but not the only way to test patentability.
The Court also refused to adopt a flat rule that business methods can never be patented, noting that federal law already assumes some business-method patents exist. So while this particular claim failed as an abstract idea, the door remains open, within limits the Court did not fully spell out, for other business methods to qualify as patentable processes in the future.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Software companies, financial firms, and other businesses that rely on process patents got clearer, if still uncertain, guidance: a 'machine-or-transformation' link is not required, but a method that amounts to nothing more than a general strategy or abstract idea still cannot be patented. This shapes what innovators can protect and what competitors remain free to use.
What changes now
The ruling is final on the merits: the application remains rejected, and the machine-or-transformation test survives only as one helpful clue among others rather than a rigid requirement. The Court left the Federal Circuit room to develop further limits on what counts as a patentable process, so lower courts and the Patent Office will continue refining how the abstract-idea exception applies to software, business methods, and other emerging technologies.
What this does not decide
The Court did not decide whether business methods in general are patentable, did not define a full test for what makes something a patentable 'process,' and did not take a position on the patentability of software or other Information Age technologies. It resolved only that this particular hedging application claimed an unpatentable abstract idea.
Concurrences and dissents
Concurrence — Justice Stevens
Justice Stevens agreed the application should fail but argued the Court should have gone further and held that business methods are categorically not patentable 'processes.' Reviewing centuries of English and American patent history, he concluded that methods of conducting business were never understood to fall within the patentable 'useful arts,' and warned that the majority's broader language about 'ordinary meaning' could invite mischief by suggesting almost any series of steps might qualify as a process.
Concurrence — Justice Breyer
Justice Breyer joined Justice Stevens' opinion in full, agreeing business methods are not patentable processes, but wrote separately to highlight four points he believed commanded agreement across the whole Court: Section 101 has limits, the machine-or-transformation test has long served as an important clue, that test is not exclusive, and satisfying it does not mean everything with a useful, concrete, tangible result is patentable. Justice Scalia joined only the portion of this opinion restating the machine-or-transformation test's role.
How the Court got there
The legal reasoning, step by step
- The Court first asked whether the machine-or-transformation test — a rule asking if an invention is tied to a machine or physically transforms something — is the only way to decide if something counts as a patentable 'process' under the Patent Act.
- It found that rule too rigid: nothing in the ordinary meaning of 'process' requires a tie to a machine or a physical transformation, and past decisions had treated the test only as a useful clue, not the exclusive gatekeeper, so reading it into the statute as the sole test improperly added a limit Congress never wrote.
- The Court then considered whether the law flatly bars patents on methods of doing business. It found no such categorical bar in the ordinary meaning of 'method,' and noted that a separate part of the Patent Act (the prior-use defense for business method patents) assumes some such patents can exist, undercutting any total ban.
- Even without either categorical bar, the Court held the application still failed because it fell within the long-recognized exception barring patents on abstract ideas — a principle the Court has applied since its decisions in Gottschalk v. Benson and Parker v. Flook.
- Applying that abstract-idea exception, the Court found that the hedging concept described in the application, and its reduction to a mathematical formula, was simply an abstract idea; adding examples of how to use it in energy markets and routine statistical techniques did not turn the abstract idea into a patentable invention.
Doctrinal impact
Cases affected by this decision
Limits State Street Bank & Trust Co. v. Signature Financial Group, Inc. (149 F. 3d 1368)
The Court declined to endorse the Federal Circuit's prior 'useful, concrete, and tangible result' test from this case.
Reaffirms Gottschalk v. Benson (409 U. S. 63)
Relied on as establishing that abstract mathematical algorithms and ideas cannot be patented.
Reaffirms Parker v. Flook (437 U. S. 584)
Relied on to show limiting an abstract idea to one field of use doesn't make it patentable.
Reaffirms Diamond v. Diehr (450 U. S. 175)
Used to show applying an abstract idea to a known process can be patentable, unlike petitioners' claims.