KSR International Co. v. Teleflex Inc.
The Supreme Court ruled that a patent on an adjustable car pedal with an attached electronic sensor was invalid because combining those two well-known parts was an obvious step for a skilled engineer, not a genuine invention.
The decision rejected a rigid test the patent appeals court had been using to decide when combining old ideas counts as 'obvious,' telling judges and patent examiners instead to use common sense and look at the full picture of market pressures, existing designs, and ordinary engineering know-how.
“We build and create by bringing to the tangible and palpable reality around us new works based on instinct, simple logic, ordinary inferences, extraordinary ideas, and sometimes even genius.”
The Court's closing reflection on why ordinary, predictable improvements should not receive patent protection.
How it got here: A federal trial court granted KSR summary judgment finding the patent claim obvious and invalid; the Federal Circuit reversed; the Supreme Court agreed to review the case.
The Case in Depth
What happened
KSR, an auto parts supplier, added an off-the-shelf electronic sensor to an adjustable gas pedal it had designed, so the pedal could work with computer-controlled engines. Teleflex, a rival pedal maker holding an exclusive license to a patent (the Engelgau patent) covering a similar adjustable pedal with a sensor, sued KSR for patent infringement. KSR argued the patented design was too obvious to deserve a patent.
The question before the Court
Could a car parts maker patent an adjustable gas pedal with an electronic sensor, when combining those two known ideas seemed like an obvious engineering step?
The Court's answer
No — the Court ruled that combining a known adjustable pedal design with a known electronic sensor at the pedal's fixed pivot point was obvious, so the patent claim covering that combination was invalid. The Court found that a designer with ordinary skill, facing a marketplace pushing toward computer-controlled engines, would naturally have looked to existing sensor designs and put one at the pedal's fixed point.
In reaching that result, the Court rejected the rigid rule used by the patent appeals court, which required specific evidence that prior designs pointed toward exactly this combination. Instead, the Court said common sense, market pressures, and the predictable nature of the result were enough to show the invention was not a genuine advance deserving patent protection.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
The ruling made it harder to patent products that simply combine existing technologies in predictable ways, which affects companies across industries — from auto parts to software to pharmaceuticals — that rely on patents to protect incremental improvements. It also gives courts more flexibility, and more responsibility, to strike down weak patents using common sense rather than a rigid checklist.
What changes now
The case goes back to the lower courts for further proceedings consistent with the Supreme Court's ruling, though the Court itself resolved that the patent claim at issue was invalid as obvious. The decision is a final merits ruling that changes how courts and the Patent Office nationwide evaluate whether an invention is too obvious to patent, moving away from a rigid checklist toward a broader, common-sense inquiry.
What this does not decide
The Court did not rule that the older 'teaching, suggestion, or motivation' approach was wrong in every application — it said the approach can be a useful tool as long as it is not applied as a rigid, mandatory formula, and left it to the patent appeals court to apply the looser standard in future cases.
How the Court got there
The legal reasoning, step by step
- The Court applied the framework from Graham v. John Deere, which asks a factfinder to compare the scope of prior existing designs with the new patent claim, gauge the skill level of an ordinary engineer in the field, and then judge obviousness against that background, sometimes with the aid of secondary evidence like commercial success.
- The Court found that the patent appeals court had instead applied a rigid 'teaching, suggestion, or motivation' requirement, insisting that prior designs must specifically point toward combining a sensor with an adjustable pedal before the combination could be called obvious.
- The Court explained that when a known technique has been used to fix one kind of device, and an ordinary engineer would see that the same fix would work on a similar device, using that technique counts as an obvious step rather than a patentable invention.
- The Court rejected the idea that engineers only look at prior designs meant to solve the very same problem they are working on, reasoning that an ordinary engineer is also a person of ordinary creativity who can mix and match ideas from unrelated designs like puzzle pieces.
- The Court also rejected the rule that showing a combination was merely 'obvious to try' can never prove obviousness, holding that when there are only a few predictable ways to solve a known problem, trying them is ordinary engineering, not invention.
- Applying this looser, common-sense approach to the pedal design at issue, the Court concluded that placing a known sensor at the pedal's fixed pivot point was a predictable, obvious step that any ordinary designer would have taken.
Doctrinal impact
Cases affected by this decision
Reaffirms Graham v. John Deere Co. (383 U.S. 1)
The Court relied on Graham's framework for judging patent obviousness as still the controlling approach.
Reaffirms Great Atlantic & Pacific Tea Co. v. Supermarket Equipment Corp. (340 U.S. 147)
The Court relied on this case's caution against patenting combinations of old elements with no change in function.
Reaffirms United States v. Adams (383 U.S. 39)
The Court used this case to illustrate when combining known elements can still be non-obvious.
Reaffirms Sakraida v. AG Pro, Inc. (425 U.S. 273)
The Court cited this case's rule that rearranging old elements with no new result is obvious.