Wirtgen America v. Caterpillar: Federal Circuit Appeal Voluntarily Dismissed
Wirtgen America and Caterpillar jointly agreed to dismiss a Federal Circuit appeal in a patentability dispute over US9879390B2, a patent covering road milling machines and milling depth measurement. The case closed 214 days after filing, with no merits ruling and each side absorbing its own costs.
A road milling patent appeal ends by agreement, no merits decided
Wirtgen America, Inc. — the U.S. arm of the leading road construction equipment group — filed this appeal at the Court of Appeals for the Federal Circuit on 29 March 2024, challenging a ruling in a patentability dispute against Caterpillar, Inc. The patent at the centre of the dispute, US9879390B2, covers a road milling machine and a method for measuring milling depth, a technically precise function critical to road surface preparation and construction equipment performance.
The appeal was terminated on 29 October 2024 when both parties agreed to dismiss the proceeding under Fed. R. App. P. 42(b). The court entered the dismissal as ordered without reaching the merits of the patentability challenge. Crucially, the public record does not specify whether the dismissal was with or without prejudice, meaning the long-term preclusive effect on either party’s ability to relitigate the same issues remains uncertain from the available record alone.
The 214-day duration suggests the parties reached agreement relatively early in the Federal Circuit appellate cycle, possibly indicating a negotiated resolution or a commercial decision to avoid the costs and uncertainty of appellate briefing. What drove the settlement or agreement is not disclosed in the public record. The cost-neutral outcome — each side bearing its own expenses — is consistent with a mutual decision to exit rather than a capitulation by either party.
Filing to Voluntary dismissal in 214 days
214 days — appeal resolved well within the Federal Circuit’s typical 12–24 month cycle
Voluntarily dismissed: what the agreed exit means for both parties
Fed. R. App. P. 42(b) dismissal: no merits ruling issued
A dismissal under Federal Rule of Appellate Procedure 42(b) is a procedural exit by agreement of the parties. The Federal Circuit issues no opinion on the patentability questions raised, meaning the underlying invalidity or cancellation arguments advanced by Caterpillar were never adjudicated on the merits. The patent’s validity status is left in the same position it was before the appeal was filed.
Procedural exit — no opinion issuedWith or without prejudice? The public record is silent
A voluntary dismissal can be with prejudice (barring refiling of the same claim) or without prejudice (preserving the right to refile). The court order in this case does not specify which applies. This distinction is commercially significant: without prejudice would leave open the possibility of future challenge to US9879390B2; with prejudice would foreclose it. Practitioners monitoring this dispute should not assume either characterisation from the available public record.
Prejudice character unspecifiedPatent survives appeal — enforceability position unchanged
For Wirtgen America, the dismissal means US9879390B2 remains in force without an adverse appellate ruling. The patent’s validity was not overturned at this stage. However, because no merits ruling was issued, Wirtgen cannot point to a judicial affirmance of validity — the patent’s enforceability rests on the same pre-appeal footing. Any future enforcement campaign will proceed without the benefit of a Federal Circuit validity endorsement.
Patent intact, no appellate endorsementChallenge withdrawn — road milling IP risk persists
Caterpillar’s agreement to dismiss suggests a commercial calculation that continuing the appeal was not the optimal path. Without a merits ruling cancelling or narrowing US9879390B2, Caterpillar faces ongoing exposure to the patent in any road milling product line that overlaps with the claimed milling depth measurement methods. The absence of a cost award provides no financial signal about relative litigation posture strength.
Infringement exposure persistsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Wirtgen Americac | Individual | Road construction equipment manufacturer — holder of US9879390B2Search in Eureka ↗ |
| Defendant | Caterpillar, Inc. | Company | Caterpillar, Inc. — global heavy equipment manufacturer and road milling competitorSearch in Eureka ↗ |
| Plaintiff counsel | Mark Andrew Kilgore Ph.D. | Attorney | Counsel for Wirtgen AmericacSearch in Eureka ↗ |
| Plaintiff counsel | Nathan I. North | Attorney | Counsel for Wirtgen AmericacSearch in Eureka ↗ |
| Plaintiff counsel | Ralph Wilson Powers III | Attorney | Counsel for Wirtgen AmericacSearch in Eureka ↗ |
| Plaintiff counsel | Ryan D. Levy | Attorney | Counsel for Wirtgen AmericacSearch in Eureka ↗ |
| Plaintiff counsel | Seth R. Ogden | Attorney | Counsel for Wirtgen AmericacSearch in Eureka ↗ |
| Plaintiff counsel | William E. Sekyi | Attorney | Counsel for Wirtgen AmericacSearch in Eureka ↗ |
| Plaintiff law firm | Patterson Intellectual Property Law PC | Law Firm | Representing Wirtgen AmericacSearch in Eureka ↗ |
| Plaintiff law firm | Sterne, Kessler, Goldstein & Fox PLLC | Law Firm | Representing Wirtgen AmericacSearch in Eureka ↗ |
| Defendant counsel | Benjamin Aaron Saidman | Attorney | Counsel for Caterpillar, Inc.Search in Eureka ↗ |
| Defendant counsel | Daniel Cooley | Attorney | Counsel for Caterpillar, Inc.Search in Eureka ↗ |
| Defendant counsel | David Mroz | Attorney | Counsel for Caterpillar, Inc.Search in Eureka ↗ |
| Defendant counsel | Jason Lee Romrell | Attorney | Counsel for Caterpillar, Inc.Search in Eureka ↗ |
| Defendant counsel | Joshua Goldberg | Attorney | Counsel for Caterpillar, Inc.Search in Eureka ↗ |
| Defendant law firm | Finnegan, Henderson, Farabow, Garrett & Dunner, LLP | Law Firm | Representing Caterpillar, Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Court of Appeals for the Federal CircuitSearch in Eureka ↗ |
Official order — verbatim text
The order reflects a consensual procedural termination under Fed. R. App. P. 42(b) — not an adjudication of the patentability questions at issue. The Federal Circuit issued no opinion on the merits of the invalidity or cancellation challenge to US9879390B2. The cost-neutral provision (‘each side shall bear their own costs’) is consistent with a mutual decision to exit and provides no judicial signal about the relative merit of either party’s appellate position. The prejudice character of the dismissal is not specified in the order.
US9879390B2 — Road milling machine and milling depth measurement
US9879390B2, filed under application number US15/376023, protects a road milling machine and an associated method for measuring milling depth — a precision-critical parameter in road surface preparation and rehabilitation. The patent sits within the specialised domain of construction machinery control systems, where accurate depth measurement directly affects surface quality, material removal efficiency, and compliance with road construction specifications. The technology addresses a specific operational challenge in cold milling equipment.
For the road milling equipment sector, this patent is strategically significant because milling depth measurement is integral to the performance differentiation of modern cold milling machines. Wirtgen holds a dominant position in this market, and patents covering measurement and control methodology represent a barrier to competitors seeking to match precision performance. The Caterpillar dispute — reaching Federal Circuit level — underscores the commercial stakes around this technology and the competitive sensitivity of encroaching on Wirtgen’s measurement IP.
Should your road milling product line be cleared against US9879390B2?
Any manufacturer, OEM, or technology integrator developing road milling machines or aftermarket depth-measurement systems for cold milling equipment should treat US9879390B2 as a live FTO concern. The patent survived a Federal Circuit appeal without any narrowing or cancellation — meaning its claims stand as issued. Product teams incorporating automated or sensor-based milling depth measurement functionality are particularly exposed and should conduct claim-mapping before commercialisation.
PatSnap Eureka’s FTO Search Agent enables engineering and IP teams to map product features against the specific claims of US9879390B2, identify prior art that may support design-around strategies, and monitor Wirtgen’s broader milling technology portfolio for continuation or divisional filings that could extend the IP perimeter. Automated monitoring alerts can flag new Wirtgen applications in the road milling control systems space before they reach grant.
Run a freedom-to-operate analysis on US9879390B2 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit road milling and construction equipment patent appeals
Cases involving road milling equipment patents and patentability challenges at the Federal Circuit, relevant to US9879390B2 and the Wirtgen v. Caterpillar dispute.
What this case signals for the road milling equipment IP landscape
A Federal Circuit voluntary dismissal in a road milling patent dispute carries implications beyond these two parties for anyone operating in heavy construction equipment.
US9879390B2 remains enforceable — monitor Wirtgen’s licensing posture
With no Federal Circuit merits ruling, US9879390B2 stands unchallenged at the appellate level. Competitors and OEMs in the road milling sector should treat this patent as active enforcement risk. Wirtgen’s decision to pursue appeal — and the manner of exit — suggests continued commercial commitment to this IP right.
Voluntary dismissals often signal commercial resolution — watch for licensing deals
A mutual agreement to dismiss under Rule 42(b) with no cost award is consistent with a negotiated commercial outcome between the parties. Industry observers and third-party competitors should watch for licensing announcements, supply agreements, or product design changes that may follow from any undisclosed agreement between Wirtgen and Caterpillar.
Americac v Caterpillar — key questions answered
The Federal Circuit appeal (Case 24-1618) was voluntarily dismissed by agreement of both parties under Fed. R. App. P. 42(b) on 29 October 2024. No merits ruling was issued on the patentability of US9879390B2. Each party bore its own costs. The case lasted 214 days from filing.
US9879390B2 covers a road milling machine and a method for measuring milling depth. It relates to precision measurement and control technology in cold milling equipment used in road construction and surface rehabilitation. The patent was the subject of an invalidity or cancellation challenge by Caterpillar that reached the Federal Circuit before being voluntarily dismissed.
Yes, US9879390B2 remains in force. The voluntary dismissal under Rule 42(b) means the Federal Circuit issued no opinion on validity or patentability. The patent was not cancelled or narrowed by this proceeding. Its enforceability stands on the same footing as before the appeal was filed.
Fed. R. App. P. 42(b) allows parties to dismiss an appeal by agreement without the court ruling on the merits. The proceeding ends and no appellate opinion is issued. The public record in case 24-1618 does not specify whether the dismissal is with or without prejudice, which affects whether the same issues can be relitigated.
Because US9879390B2 was not cancelled or narrowed by the Federal Circuit, its claims remain as issued and represent active FTO risk for any manufacturer incorporating automated milling depth measurement technology in cold milling equipment. Third-party OEMs and technology integrators should conduct claim-mapping and monitor Wirtgen’s continuation filing activity in this technology domain.
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