Sonix v. Publications International: How a Term of Degree Survives

Sonix Technology Co. v. Publications International, Ltd., 844 F.3d 1370 (Fed. Cir. 2017), No. 2016-1449, decided January 5, 2017, is the affirmative counterpart to cases like Interval Licensing v. AOL. Where Interval shows how a subjective term of degree fails the reasonable-certainty standard, Sonix shows how one survives. In an opinion by Judge Lourie, the Federal Circuit reversed a summary judgment of indefiniteness, holding that the claim term “visually negligible” was not purely subjective because it was tethered to an objective baseline — what the normal human eye can perceive — and was further illuminated by the specification’s examples and the prosecution history.

At a glance

• Case: Sonix Technology Co. v. Publications International, Ltd., 844 F.3d 1370 (Fed. Cir. 2017), No. 2016-1449
• Decided: January 5, 2017; opinion by Judge Lourie
• Patent: U.S. Patent No. 7,328,845 (encoding data on an object’s surface using a graphical indicator)
• Disposition: Reversed the district court’s summary judgment of indefiniteness; remanded
• Key term: “visually negligible”

The invention and the dispute

Sonix’s ‘845 patent addressed a problem in encoding machine-readable data on a printed surface. Conventional approaches — visible barcodes or matrix codes — clutter the page and interfere with the human-readable content. Sonix’s contribution was to render the graphical indicator visually negligible: the encoded micro-units are printed so small and sparse that a reader barely perceives them, yet a device can still decode the embedded information. The technology found use in interactive books and similar products where a stylus reads hidden codes to trigger audio.

The defendants challenged the term “visually negligible” as indefinite, arguing it was a subjective measure of how noticeable a marking is — the same vice that sank “unobtrusive manner” in Interval. The district court agreed and entered summary judgment of invalidity. The Federal Circuit reversed.

Why “visually negligible” cleared the bar

The court’s analysis turned on a distinction that is now central to terms-of-degree doctrine: the difference between a term that is purely subjective and one that is subjective in form but objectively anchored.

“Visually negligible,” the court held, is not purely subjective. Although it is a term of degree, it has an inherent objective referent: what can be seen by the normal human eye. That baseline does not depend on the idiosyncratic reaction of a particular observer the way “unobtrusive” or “distracting” does. Human visual perception supplies a reasonably stable, externally verifiable standard against which a marking’s negligibility can be measured.

The court then found that the intrinsic record reinforced that anchor in two ways. First, the written description supplied concrete examples of visually negligible indicators — including a quantified illustration in which each square centimeter contains roughly 3,000 matrix cells, fewer than 70% of which carry a graphical micro-unit, with each micro-unit occupying less than 80% of its cell. These were not the lone, non-limiting “such as” example that failed to rescue the claim in Interval; they gave a skilled artisan worked specimens describing how to achieve the claimed visual negligibility. Second, the prosecution history showed the examiner and applicant using the term consistently, with the examiner applying it without difficulty during examination — evidence that those skilled in the art could and did apply the term with reasonable certainty.

The instructive contrast with Interval

Reading Sonix against Interval yields the clearest available picture of where the reasonable-certainty line falls for terms of degree, and the two cases are best taught as a pair.

Both terms — “unobtrusive manner” and “visually negligible” — describe how noticeable something is. The decisive difference is the source of the standard. “Unobtrusive” measures whether a display distracts a user, a judgment that depends on the user’s attention, task, and disposition; the patent supplied no objective metric and only a single permissive example. “Visually negligible” measures whether a marking is perceptible to the normal human eye — a baseline external to any particular reader’s preference — and the patent supplied quantified examples plus a consistent prosecution record.

The lesson is that the inquiry is not whether a term sounds relative or subjective but whether it is anchored to something objective that a skilled artisan can apply. A relative term riding on a human-perception baseline, fortified by examples and a clean prosecution history, can be reasonably certain. A relative term riding on a viewer’s subjective reaction, propped up by a lone illustration, is not.

Open questions

Sonix confirms that an objective baseline plus supporting intrinsic evidence can save a term of degree, but it does not specify how much of each is required. Would the human-eye baseline alone have sufficed without the quantified examples? Would the examples have sufficed without a baseline? The opinion treats the factors as mutually reinforcing rather than independently dispositive, leaving the minimum threshold to future cases. The decision also leaves unsettled how courts should weigh a clean prosecution history — in which the term was applied without confusion — against later litigation testimony that the term is unclear. Sonix treated examiner usage as probative of reasonable certainty, but the evidentiary weight of such usage remains contested.

Implications for inventors and businesses

• Anchor relative terms to an objective referent. A term of degree is far safer when it is measured against something external and verifiable — human perception, a physical property, a standardized test — rather than a reader’s subjective reaction.
• Supply quantified, repeatable examples. Unlike the lone “such as” illustration that failed in Interval, the worked, numerical examples in Sonix helped establish that skilled artisans could apply the term. Build the specification to teach how the claimed degree is achieved.
• Mind the prosecution record. Consistent, confusion-free use of a term during examination is evidence of definiteness. Inconsistent or shifting usage can undercut it.
• Definiteness is winnable for patentees. Sonix is a reminder that a well-supported term of degree withstands a Nautilus challenge; indefiniteness is not a one-way ratchet against patent owners.

Frequently asked questions

Was “visually negligible” held definite or indefinite? Definite. The Federal Circuit reversed the district court’s finding of indefiniteness, holding the term informed skilled artisans of the claim’s scope with reasonable certainty.

What made it different from “unobtrusive manner” in Interval? “Visually negligible” was anchored to an objective baseline — what the normal human eye can perceive — and supported by quantified examples and a consistent prosecution history. “Unobtrusive manner” depended on a user’s subjective reaction with no objective metric and only a single non-limiting example.

Does Sonix mean numerical limits are required to claim a term of degree? No. It holds that an objective baseline together with supporting intrinsic evidence can suffice. Quantified examples helped, but the controlling point is that the term must be objectively anchored, not that it must carry a numerical boundary.

Authorities and sources

• Sonix Technology Co. v. Publications International, Ltd., 844 F.3d 1370 (Fed. Cir. 2017), No. 2016-1449 (Jan. 5, 2017). Opinion via Google Scholar.
• Decision date, Lourie authorship, U.S. Patent No. 7,328,845, the “visually negligible” holding, and the human-eye baseline corroborated by the Federal Circuit Bar Journal and Xsensus IP Law.