Densys v. Align Technology & Medit — Dental Scanning Patents Survive Section 101 Challenge, but Willfulness and Indirect Infringement Claims Dismissed

Background

Densys Ltd., an Israeli company founded in 2000 by Dr. Moshe Ernst, is a pioneer in intra-oral dental scanning technology. The company sued two major competitors — Align Technology Inc. (maker of the iTero scanner line) and Medit Corp. (maker of the i900, i700, and other scanners) — for infringing two of its patents.

The first patent, U.S. Patent No. 6,402,707 (the “’707 Patent,” issued 2002), covers a method and system for real-time intra-oral 3D measurement and imaging. Its key innovation is using a fixed reference point inside the patient’s mouth so that successive scans from different angles can be accurately registered together without the repositioning errors that plagued earlier approaches.

The second patent, U.S. Patent No. 8,665,257 (the “’257 Patent,” issued 2014), covers a 3D oral cavity modeling system that uses structured illumination with random patterns. By projecting random patterns and using parallax calculations, the system avoids the aliasing problems (false pattern matching) that limit traditional structured-light scanning in the tight confines of a patient’s mouth.

Align moved to dismiss under Rule 12(b)(6) on multiple grounds, including that both patents are invalid under Section 101. Medit separately moved to dismiss the willful, contributory, and indirect infringement claims.

The Court’s Holding

Section 101 challenge — DENIED. Judge Williams found that both patents survive Alice Step One because they claim specific technological improvements, not abstract ideas.

For the ’707 Patent, the court analogized to Thales Visionix v. United States (Fed. Cir. 2017), where claims directed to a specific configuration of inertial sensors for motion tracking were held patent-eligible. Like the Thales claims, the ’707 Patent’s use of a fixed intra-oral reference point represents a concrete hardware-and-method solution to a specific measurement problem — not an attempt to monopolize an abstract mathematical concept. Any mathematical equations in the claims are merely a “consequence” of the claimed invention, not its focus.

For the ’257 Patent, the court found the claims specify a “particularized method for improving 3D intra-oral imaging through random pattern projection and spatial calculations,” analogizing to Koninklijke KPN v. Gemalto (Fed. Cir. 2019). The court rejected Align’s attempt to reduce the claims to “storing random patterns,” finding that oversimplification would violate the principle from McRO v. Bandai Namco that courts must analyze claims at the appropriate level of specificity.

Direct infringement of the ’257 Patent — DISMISSED (without prejudice). While the court declined to resolve claim construction disputes about “random patterns” at the pleading stage, it found Densys failed to plausibly allege that Align’s products contain a “memory” for storing pattern arrays. Densys pointed vaguely to Align’s scanner heads but could not show the diffractive elements actually store multiple patterns rather than generating a single fixed spot shape.

Willful and indirect infringement — DISMISSED against both defendants (without prejudice). The court found Densys failed to adequately plead that either Align or Medit had pre-suit knowledge of the specific patents and of their own infringement. Trade-show attendance, citation of related patents in a company’s own filings, and awareness of unrelated litigation by competitors were all held insufficient to establish the requisite knowledge. The court also held that the complaint itself cannot serve as the basis for post-suit knowledge sufficient to support willfulness or indirect infringement claims — consistent with a growing line of D. Del. authority.

Key Takeaways

• Physical measurement and imaging patents that tie mathematical calculations to specific hardware configurations continue to survive Section 101 challenges, even when the claims involve mathematical algorithms — the question is whether the math is the “focus” of the claim or merely a “consequence” of a concrete technical solution.
• The Thales Visionix framework remains a powerful tool for defending hardware-tied patents: when claims specify a particular arrangement of physical components to solve a measurement or imaging problem, they are directed to patentable subject matter even if the underlying technique uses well-known mathematical principles.
• Pre-suit knowledge of infringement is difficult to establish without direct notice. Trade-show encounters, knowledge of related (but different) patents, and awareness of third-party litigation are all insufficient under current D. Del. standards.
• All dismissals except the Section 101 ruling were without prejudice, meaning Densys can replead with additional facts supporting knowledge and infringement theories.

Why It Matters

This decision offers a useful roadmap for medtech and hardware companies defending their patents against Section 101 challenges. While software and fintech patents continue to face an uphill battle under Alice, patents claiming specific physical measurement techniques — even those with mathematical components — can survive when they are tied to concrete improvements in how a device works. The ruling also highlights a growing tension in pleading standards for willful infringement: courts increasingly demand specific factual allegations of pre-suit knowledge, making it difficult for patent owners to assert willfulness claims at the outset of litigation without direct cease-and-desist correspondence or licensing negotiations before filing suit.