Background
Satius Holding sued Samsung Electronics Co., Ltd. and Samsung Electronics America, Inc. in 2018, alleging infringement of claims 1, 11, and 18 of U.S. Patent No. 6,711,385. The patent concerns a communications apparatus with a coupler that matches a transmitter’s output impedance to the characteristic impedance of air. Representative claim 1 recites an apparatus for transmitting “electric or electromagnetic signals over air.”
After staying the litigation for Patent and Trademark Office reexamination proceedings, the District of Delaware resumed the case and construed the claims. The district court held claims 1, 11, and 18 indefinite because transmitting electric signals over air is scientifically impossible, and it entered final judgment of invalidity for Samsung. Although the court expressed doubts about enablement, it declined to decide that issue. Satius appealed.
The Court’s Holding
The Federal Circuit rejected the district court’s indefiniteness analysis. It construed “transmitting electric . . . signals over air” as requiring transmission of signals in electric form over air, which the parties agreed is scientifically impossible. But impossibility does not automatically create indefiniteness: the relevant question under 35 U.S.C. § 112(b) is whether the claims inform skilled artisans, with reasonable certainty, about their scope. Because the claims clearly encompassed the impossible embodiment, they were definite even though that embodiment was inoperable.
The court nevertheless affirmed the judgment of invalidity on the alternative ground of lack of enablement under 35 U.S.C. § 112(a). It exercised its discretion to reach that issue because the parties had fully briefed it, there was no factual dispute about the scientific impossibility, and remand would serve no purpose. Because a patent must enable the full scope of its claims, and the asserted claims expressly covered an embodiment that a skilled artisan could not make or use, claims 1, 11, and 18 were not enabled.
Key Takeaways
- A claim is not indefinite merely because it covers an impossible or inoperable embodiment; indefiniteness turns on whether the claim’s scope is reasonably certain.
- A scientifically impossible limitation may instead defeat enablement when the claim expressly includes that limitation and the specification cannot enable the claim’s full scope.
- The Federal Circuit may affirm on an alternative invalidity ground not decided below when the issue is fully briefed, presents no material factual dispute, and its resolution is beyond doubt.
Why It Matters
The decision distinguishes two separate Patent Act requirements that can produce different outcomes from the same claim language. Clear language may satisfy definiteness even when it describes something impossible, but that clarity does not save the patent if the specification cannot teach a skilled artisan to make and use the full claimed invention.
The ruling also warns patentees that drafting claims to include alternative embodiments can broaden the enablement burden. When one expressly claimed alternative is scientifically impossible, the entire claim—and dependent claims incorporating it—may be invalid for lack of enablement.