In re: U.S. Well Services v. Halliburton — Federal Circuit Appeal Voluntarily Dismissed
U.S. Well Services, LLC brought an appeal before the Federal Circuit challenging a patentability ruling concerning US9611728B2, a patent covering cold weather packages for oil field hydraulic systems. After 584 days, the appeal was voluntarily dismissed under FRAP 42(b), with U.S. Well Services agreeing to bear its own costs — leaving the underlying invalidity determination intact.
A Federal Circuit oilfield patent appeal ends before a merits ruling
Filed on 3 April 2023 at the Court of Appeals for the Federal Circuit (Case No. 23-1690), this appeal pitted U.S. Well Services, LLC against Halliburton Co. over the patentability of US9611728B2 — a patent directed at cold weather packages for oil field hydraulic systems. The underlying proceeding was an invalidity/cancellation action, suggesting the patent’s validity had been challenged at the Patent Trial and Appeal Board or a comparable forum before reaching the Federal Circuit.
The appeal closed on 7 November 2024 via U.S. Well Services’ stipulation of voluntary dismissal pursuant to Federal Rule of Appellate Procedure 42(b). Critically, the dismissal order specifies only that U.S. Well Services agreed to bear its own costs — it does not expressly state whether the dismissal was with or without prejudice. Under FRAP 42(b), the terms of such a dismissal are governed by the stipulation itself, and the public record here is silent on preclusive effect.
The 584-day duration before dismissal is notable: it suggests the parties engaged in substantial briefing or negotiation before U.S. Well Services elected to withdraw. What drove that decision — whether a licensing arrangement, a commercial settlement, a strategic reassessment of claim viability, or other factors — is not disclosed in the public record. The underlying invalidity or cancellation determination that prompted the appeal therefore remains unreviewed on the merits by the Federal Circuit.
Filing to Voluntary dismissal in 584 days
584 days — longer than the median Federal Circuit appeal lifecycle of ~450 days
Voluntarily dismissed: what the FRAP 42(b) withdrawal means for both parties
FRAP 42(b) voluntary dismissal — no merits ruling issued
Federal Rule of Appellate Procedure 42(b) permits an appellant to dismiss an appeal by filing a signed dismissal agreement. The Federal Circuit issued no opinion on patentability, invalidity, or claim construction. The underlying administrative or district court ruling that U.S. Well Services was appealing therefore stands undisturbed — not because the Federal Circuit affirmed it, but because it was never reviewed on the merits.
Procedural exit — no appellate merits rulingThe public record is silent on preclusive effect
A FRAP 42(b) dismissal can be with or without prejudice to refiling, depending on the terms of the stipulation. Where a dismissal is with prejudice, the appellant waives future appellate review of the same ruling. Where it is without prejudice, limited re-approach pathways may exist. The order in Case No. 23-1690 states only that the appeals are ‘voluntarily dismissed’ — it does not specify either condition, leaving the preclusive scope of this dismissal uncertain from the public record alone.
Prejudice terms: not stated on recordU.S. Well Services exits the appeal bearing its own costs
By agreeing to bear its own costs across each appeal, U.S. Well Services absorbed the litigation expense without securing any appellate relief. The invalidity or cancellation finding that prompted the appeal is left standing. Whether the company retained any commercial or licensing value from US9611728B2 post-dismissal depends on the scope of the underlying ruling — information not available in the public record.
Appellant bears own costs; no relief obtainedHalliburton avoids a Federal Circuit merits ruling — for now
Halliburton, represented by Baker Botts LLP, secured closure of the Federal Circuit appeal without any appellate review of the invalidity determination. This outcome is commercially favourable: it removes the risk of a Federal Circuit reversal that could have reinstated US9611728B2 in full force. However, because no merits ruling was issued, Halliburton does not benefit from a precedential Federal Circuit opinion confirming invalidity.
No precedential invalidity ruling — Halliburton not boundFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | In re: U.S. WELL SERVICES, LLC | Company | Oilfield pressure pumping company — holder of US9611728B2Search in Eureka ↗ |
| Defendant | Halliburton, Co. | Company | Halliburton Co. — global oilfield services and pressure pumping competitorSearch in Eureka ↗ |
| Plaintiff counsel | Matthew James Dowd | Attorney | Counsel for In re: U.S. WELL SERVICES, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Robert James Scheffel | Attorney | Counsel for In re: U.S. WELL SERVICES, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Dowd Scheffel PLLC | Law Firm | Representing In re: U.S. WELL SERVICES, LLCSearch in Eureka ↗ |
| Defendant counsel | Chad C. Walters | Attorney | Counsel for Halliburton, Co.Search in Eureka ↗ |
| Defendant law firm | Baker Botts LLP | Law Firm | Representing Halliburton, Co.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Court of Appeals for the Federal CircuitSearch in Eureka ↗ |
Official order — verbatim text
The dismissal order is deliberately terse: it records U.S. Well Services’ stipulation under FRAP 42(b) and the cost-bearing agreement, but issues no substantive ruling. This means the Federal Circuit applied no standard of review — substantial evidence, de novo, or otherwise — to the patentability question. For practitioners, the absence of a merits disposition means this case creates no binding or persuasive precedent on invalidity, claim construction, or the technology at issue. The underlying tribunal’s ruling governs unless separately challenged.
US9611728B2 — Cold weather package for oil field hydraulic systems
US9611728B2, filed under application number US15/145440, covers cold weather package technology for oil field hydraulic systems — innovations designed to maintain operational reliability of high-pressure hydraulic fracturing equipment in sub-zero or extreme cold environments. Such technology is strategically significant in northern and high-altitude oilfield operations where standard hydraulic components risk failure due to thermal contraction, fluid viscosity changes, and freezing. The patent was asserted by U.S. Well Services, a pressure pumping specialist, in an invalidity/cancellation action, indicating the claims were contested as lacking novelty or non-obviousness.
For the oilfield services sector, patents covering environmental hardening of fracturing equipment represent a meaningful competitive differentiator — particularly as operators expand into colder basins including the Permian in winter conditions, the Bakken, and Canadian shale plays. Halliburton’s challenge to this patent’s validity, and the Federal Circuit appeal that followed, is consistent with the competitive dynamic between large integrated oilfield services companies and specialist pressure pumping firms. The outcome — withdrawal without Federal Circuit review — leaves the patent’s commercial enforceability in a grey zone that competitors and product designers should actively monitor.
Should you run an FTO analysis against US9611728B2?
Any company designing, manufacturing, or deploying cold weather packages for oilfield hydraulic or fracturing equipment should assess exposure to US9611728B2. While the underlying invalidity proceeding challenged the patent’s validity, no Federal Circuit opinion has expressly cancelled the claims — meaning the patent may still carry enforceability risk depending on the current claim status at the USPTO. R&D teams developing winterisation solutions for pressure pumping equipment should conduct a targeted FTO before commercialisation.
PatSnap Eureka’s FTO Search Agent allows you to map your cold weather hydraulic system design against the claim scope of US9611728B2 and related prior art in real time. Eureka can identify claim elements most likely to overlap with your product architecture, surface the PTAB or USPTO proceedings that may have modified claim scope, and flag related patents in U.S. Well Services’ and Halliburton’s portfolios that could represent parallel infringement risk — all in a single guided workflow.
Run a freedom-to-operate analysis on US9611728B2 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit oilfield services patent invalidity appeals
These cases involve Federal Circuit appeals of PTAB invalidity or cancellation proceedings in the oilfield services and hydraulic fracturing technology sector.
What this case signals for the oilfield services IP landscape
Late-stage Federal Circuit withdrawals in oilfield patent disputes often signal shifting commercial dynamics worth tracking.
Voluntary Federal Circuit dismissals rarely happen without a commercial trigger
When an appellant walks away after 584 days of appellate proceedings — absorbing its own costs — it typically signals a material change in commercial circumstances: a licensing deal, a business restructuring, or a strategic reassessment of patent value. Monitoring U.S. Well Services’ licensing activity and subsequent patent filings around cold weather hydraulic technology is warranted.
US9611728B2’s enforceability status is now commercially ambiguous
The underlying invalidity or cancellation ruling was not overturned on appeal. Companies operating cold weather oilfield hydraulic systems should treat this patent’s enforceability with caution — but note that no Federal Circuit opinion expressly cancelled the claims. A formal FTO analysis against the patent’s current claim status is advisable before product launch or design decisions in this space.
In v Halliburton — key questions answered
U.S. Well Services, LLC voluntarily dismissed its Federal Circuit appeal (Case No. 23-1690) on 7 November 2024 under FRAP 42(b), agreeing to bear its own costs. The appeal concerned the patentability of US9611728B2, a cold weather package for oilfield hydraulic systems. No merits ruling was issued by the Federal Circuit.
A FRAP 42(b) dismissal allows an appellant to withdraw an appeal by stipulation without a merits ruling. The court issues no opinion on the substantive legal questions. The lower tribunal’s ruling stands undisturbed — not because the Federal Circuit affirmed it, but because it was never reviewed. The preclusive effect depends on whether the dismissal was with or without prejudice, which is not always specified in the public order.
The enforceability of US9611728B2 is commercially ambiguous following this dismissal. The underlying invalidity or cancellation ruling was not overturned on appeal, suggesting claims may have been cancelled or limited. However, no Federal Circuit opinion expressly confirmed invalidity. A current USPTO status check and formal FTO analysis are necessary to determine the patent’s operative claim scope.
The public record does not disclose the reason for the withdrawal. The 584-day duration before dismissal and the cost-bearing stipulation suggest the decision followed substantial briefing or negotiation. Common drivers for such late-stage voluntary dismissals include commercial settlements, licensing agreements, a reassessment of appellate merit, or business restructuring — none of which are confirmed in the case record.
The dispute centred on the patentability of US9611728B2, which covers cold weather package technology for oil field hydraulic systems. The underlying proceeding was an invalidity/cancellation action — consistent with a PTAB inter partes review — in which Halliburton challenged the validity of U.S. Well Services’ patent. The Federal Circuit appeal arose from that proceeding, but was withdrawn before any appellate ruling on the merits.
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