Federal Circuit Patent Watch: Omission of a Coinventor Renders a Patent Invalid When That Error Cannot Be Corrected

Why It Matters

Companies risk losing enforceable patent rights if they fail to list every true inventor and cannot later correct the omission, exposing them to costly infringement defenses. The precedent tightens USPTO and court expectations, prompting more rigorous internal inventor tracking.

Key Takeaways

• Omitted coinventor makes patent invalid if correction impossible
• 35 U.S.C. §256(b) requires notice and hearing for inventorship correction
• Fortress Iron added one missing inventor but not the second, causing invalidity
• Court linked omission to §101 invalidity, not merely §256 correction
• Decision warns companies to verify all contributors before filing patents

Pulse Analysis

Inventorship is a foundational requirement of U.S. patent law, and the statutes governing correction are deliberately narrow. Section 256(b) permits a patent to be saved from invalidity only when the USPTO, or a court, can correct the error after providing notice and a hearing to every "party concerned." This procedural safeguard ensures that all individuals with a legal claim to the invention are heard, preventing later disputes over ownership that could undermine the integrity of the patent system.

In Fortress Iron v. Digger, the Federal Circuit applied that safeguard rigorously. The company had omitted a Chinese collaborator, Hua‑Ping Huang, from the original patent filings. While Fortress was able to add one omitted inventor under §256(a), it could not locate Huang to satisfy the notice‑and‑hearing prerequisite for the second correction. Consequently, the court treated the omission as a fatal defect, rendering the patents invalid under §101 for lacking proper inventorship. The decision underscores that even a single uncorrectable omission can dismantle a patent portfolio, regardless of the commercial value of the underlying technology.

The broader implication for businesses is clear: robust inventor identification processes must be embedded early in R&D workflows. Companies should maintain detailed contribution logs, secure written acknowledgments from all contributors, and conduct pre‑filing audits to verify that every qualifying individual is named. Failure to do so not only jeopardizes enforcement but also invites costly litigation and potential loss of market exclusivity. As courts continue to enforce strict compliance, firms that prioritize accurate inventorship will preserve stronger, more defensible patent assets.