Satius v. Samsung: When Scientific Impossibility Becomes a Patent Enablement Problem

A patent claim can be clear enough to understand and still claim something that cannot be done. In a precedential decision issued October 1, 2026, the Federal Circuit drew that line sharply in Satius Holding, LLC v. Samsung Electronics Co., Ltd.: scientific impossibility did not make the claims indefinite, but it did make them fail the enablement requirement because the claims expressly covered an inoperable alternative.

The distinction matters for patent applicants, patent owners, and accused infringers. Section 112 contains separate requirements, and a defect that does not destroy claim clarity may still invalidate the patent because the specification cannot teach a skilled artisan how to practice the full scope actually claimed.

The Federal Circuit’s precedential opinion is especially useful because it connects claim drafting, claim construction, and enablement in a concrete way. The court refused to rewrite awkward claim language to make the invention operable, rejected a categorical link between impossibility and indefiniteness, and then affirmed invalidity on a different Section 112 ground.

The patent claimed two ways to transmit a signal over air

Satius sued Samsung in 2018 over U.S. Patent No. 6,711,385, which concerns a communications apparatus with a coupler designed to match the output impedance of a transmitter to the characteristic impedance of air. Independent claim 1 recited an apparatus for transmitting “electric or electromagnetic signals over air.” Dependent claims 11 and 18 depended from that claim.

The case was stayed for USPTO reexamination. After the stay was lifted, the District of Delaware addressed claim construction and ultimately held claims 1, 11, and 18 indefinite. The district court focused on an undisputed scientific point: an electric signal, as distinct from an electromagnetic signal, cannot be transmitted through air in the manner the claim required.

On appeal, Satius argued that the claim should be understood to cover an electric signal inside the device that is transformed into an electromagnetic signal before it travels through the air. The Federal Circuit rejected that reading. The claim said signals were transmitted over air, while another part of the claim separately referred to communicating signals to the air. The court would not insert an unclaimed electric-to-electromagnetic conversion step simply because doing so would make the claim technically sensible.

That point is familiar from patent claim construction: courts interpret the words the patentee chose, in the context of the intrinsic record. They do not ordinarily redraft the claim to save it from a validity problem.

Scientific impossibility did not make the claim indefinite

The Federal Circuit nevertheless disagreed with the district court’s Section 112(b) analysis. Under 35 U.S.C. § 112, definiteness asks whether the claims inform a person skilled in the art, with reasonable certainty, about the scope of the invention.

The problem in Satius was not uncertainty about what the claim covered. The parties understood that one alternative required transmitting an electric signal over air, and they agreed that doing so was scientifically impossible. In other words, the claim was clear about an impossible requirement.

The court therefore rejected any per se rule that an inoperable embodiment automatically makes a claim indefinite. Some impossible or nonsensical claim language can create a definiteness problem if a skilled artisan cannot understand the boundaries of the claim. But operability and clarity are different questions. Here, the boundaries were sufficiently clear.

That distinction can be important in litigation. An accused infringer should not assume that every technically impossible limitation belongs under Section 112(b). A patent owner likewise should not assume that defeating an indefiniteness argument cures the underlying validity issue. The same language can survive one subsection of Section 112 and fail another.

The same impossible alternative defeated enablement

After finding the claims definite, the Federal Circuit addressed enablement under Section 112(a). That provision requires the specification to teach a skilled artisan how to make and use the claimed invention. The Supreme Court emphasized the full-scope principle in Amgen Inc. v. Sanofi: the more an inventor claims, the more the disclosure must enable.

That principle was decisive in Satius. The claim expressly used an “electric or electromagnetic” alternative. Because one of those alternatives was scientifically impossible, the specification could not enable a skilled artisan to practice the full scope the claim itself covered.

The Federal Circuit affirmed the judgment of invalidity on that ground even though the district court had not decided enablement. The court explained that the issue had been adequately briefed on appeal, there was no factual dispute over the scientific impossibility, and remanding for the district court to reach the same unavoidable conclusion would serve no purpose.

The result is narrower than saying any claim containing an inoperative embodiment is automatically invalid. Satius involved an express claim limitation that added a scientifically impossible alternative to the claimed scope. The court treated that problem as fatal because the patent could not teach anyone to make or use what physics would not permit.

Why one word such as “or” can change the enablement analysis

The case is a reminder that claim breadth is created not only by abstract functional language but also by ordinary connectors and alternatives. A phrase such as “A or B” can cover two distinct categories. If the specification teaches only A, the second branch may create an enablement problem even when A is fully operable.

That does not mean patent claims should avoid alternatives. Alternatives are often necessary to capture commercially meaningful variations. The drafting question is whether each claimed branch is technically coherent and adequately supported.

During preparation of a patent application, counsel should test each independent claim as if the alternatives were separate claims. Can a skilled artisan actually practice each one? Does the specification explain the structures or transformations needed to make each branch work? Are two terms being used for genuinely different concepts, or is the claim creating accidental breadth through inconsistent terminology?

This is particularly important in electrical, software, communications, biotechnology, and chemical inventions, where a seemingly small wording choice can carry a technical meaning that is obvious to an engineer or scientist but easy to overlook during drafting.

Applicants should not rely on later claim construction to repair the specification

Once a patent is asserted, the owner may be tempted to argue for a construction that preserves operability. Satius shows the limit of that approach. The Federal Circuit would not add a conversion step that the claim did not contain merely because the step would have turned an impossible transmission into a possible one.

A better approach is to identify the technical mechanism during drafting and prosecution. If a signal changes form, a molecule must undergo a particular reaction, a computer must perform a defined transformation, or a component must have a specific physical relationship, the application should describe that mechanism with enough precision to support claims that actually require it.

Tucker Law’s patent practice approaches claim strategy together with the technical disclosure because the specification and claims must support each other. Broad language can be valuable, but breadth that outruns what can be made or used may reduce rather than increase the value of the patent.

Patent owners should perform an enablement audit before enforcement

The same analysis belongs in pre-suit diligence. Before asserting an issued patent, a patent owner should map each important claim not only to the accused product but also back to the specification. The question is not simply whether the accused product satisfies the claim. It is also whether the disclosure enables the scope the owner intends to assert.

That review should flag alternatives, broad functional limitations, genus language, unusual technical terminology, and any claim interpretation that stretches beyond the embodiments the specification actually teaches. If the patent owner needs a broad construction to establish infringement, that construction may expand the enablement burden at the same time.

For businesses already in a dispute, Tucker Law’s patent litigation practice evaluates claim construction, infringement, prior art, and Section 112 defenses together. These issues often interact: the construction that captures the accused product may also expose a validity problem, while a narrower construction may preserve validity but weaken infringement.

Accused infringers should separate Section 112 defenses

For an accused infringer, Satius is a useful reminder not to collapse indefiniteness, enablement, written description, and patent eligibility into one generalized validity argument. Each doctrine asks a different question and has a different legal framework.

A technically impossible limitation may be perfectly understandable and therefore definite. It may still be non-enabled. A broad claim may be enabled yet vulnerable to prior art. A software claim may satisfy Section 112 and still face an eligibility challenge under Section 101. Precision about the doctrine usually produces a stronger record than simply describing a claim as “too broad” or “nonsensical.”

Where an issued patent has already been through USPTO proceedings, the district-court record can still raise separate issues. In Satius, reexamination did not eliminate the later Section 112 dispute. Depending on the patent and procedural posture, post-grant options before the Patent Trial and Appeal Board may also be relevant, but they do not replace every district-court invalidity defense.

The practical takeaway from Satius v. Samsung

Satius does not say that scientific impossibility automatically makes a patent claim indefinite. It says something more useful: clarity and operability are separate requirements. A claim can clearly define an impossible embodiment, satisfy Section 112(b), and still be invalid under Section 112(a) because the specification cannot enable the full scope the patentee chose to claim.

For applicants, the drafting lesson is to test every alternative and make sure the technical disclosure supports what the claim actually says. For patent owners, the enforcement lesson is to audit enablement before adopting an expansive construction. For accused infringers, the defense lesson is to identify the correct Section 112 theory rather than relying on labels.

Tucker Law represents inventors, patent owners, and businesses in patent prosecution and patent disputes. To discuss claim drafting, an Office Action, a validity issue, or a patent infringement matter, contact Tucker Law.

This article provides general legal information and is not legal advice. Patent validity depends on the particular claims, specification, prosecution history, technology, and procedural posture.