ACQIS LLC v. Fujitsu Ltd. — Dismissed With Prejudice After 388 Days
ACQIS LLC, a patent licensing entity holding a portfolio of computer bus interface patents, sued Fujitsu Ltd. in the Western District of Texas asserting five patents against the PRIMERGY CX, MX, RX, and TX server product lines. The case ended with a stipulated dismissal with prejudice under Rule 41 — extinguishing all asserted claims permanently.
Five-Patent Bus Interface Assertion Against Fujitsu Ends Permanently
Filed on 22 December 2023 before Judge Alan D. Albright in the Western District of Texas, ACQIS LLC brought an infringement action asserting five US patents — US8756359B2, USRE044654E, US8977797B2, US9529768B2, and US9703750B2 — against Fujitsu Ltd.’s PRIMERGY-branded server products, specifically the CX, MX, RX, and TX lines. ACQIS is a patent licensing entity with a focus on computer bus interface and peripheral component interconnect technology, and this action is consistent with its broader licensing enforcement strategy.
The case closed on 13 January 2025 via a stipulated dismissal with prejudice filed under Fed. R. Civ. P. 41(a)(1)(A)(ii) — a joint procedural mechanism requiring both parties’ signatures. Dismissal with prejudice constitutes a final adjudication on the merits, meaning ACQIS is permanently barred from reasserting the same claims against Fujitsu. No defendant law firm or agent appears in the public record, and no verdict on the merits was issued, suggesting resolution was reached through negotiation.
The 388-day duration from filing to closure is consistent with pre-trial resolution, likely before significant claim construction activity concluded. The choice of a with-prejudice dismissal — rather than without prejudice — typically signals either a confidential licensing agreement or a decision by ACQIS to abandon the Fujitsu action entirely. The absence of any cost or fee ruling in the public record leaves open whether any financial consideration changed hands.
Filing to Dismissed with Prejudice in 388 days
388 days — slightly above median for W.D. Texas patent cases that settle pre-trial
Dismissed with prejudice: what Rule 41 finality means for both parties
Rule 41(a)(1)(A)(ii) — a joint, final exit from litigation
A dismissal under Fed. R. Civ. P. 41(a)(1)(A)(ii) requires a stipulation signed by all parties who have appeared — confirming this was mutually agreed. The ‘with prejudice’ designation means the dismissal operates as a final judgment on the merits. ACQIS cannot file a new action against Fujitsu on the same claims. No court order is required; the dismissal is self-executing upon filing.
Permanent claim barACQIS permanently forfeits its infringement claims against Fujitsu
By agreeing to dismissal with prejudice, ACQIS LLC surrenders all five patent claims against Fujitsu’s PRIMERGY lines permanently. This is the strongest form of closure available without a trial judgment. Whether ACQIS received licensing revenue or other consideration in exchange is not disclosed in the public record. The outcome does not affect ACQIS’s ability to assert these patents against other defendants.
Claims permanently waivedFujitsu achieves permanent immunity on all five asserted patents
Fujitsu Ltd. secures a complete and permanent bar against ACQIS re-litigating these five patents for the accused PRIMERGY product lines. This outcome is commercially significant: continued PRIMERGY sales face no residual litigation risk from ACQIS on the asserted claims. The absence of any defendant law firm in the public record is unusual and may suggest Fujitsu handled early settlement negotiations directly or through undisclosed counsel.
Full litigation immunityOutcome signals risk calculus around legacy bus interface patents in server IP
The swift resolution of a five-patent assertion against a major server OEM is consistent with the economics of patent licensing — either a negotiated licence was agreed or Fujitsu’s non-infringement or invalidity position was strong enough to prompt ACQIS to walk away. Competing server vendors facing ACQIS assertions on the same portfolio should note that with-prejudice outcomes do not invalidate the patents; ACQIS retains enforcement rights against all other parties.
Portfolio still active vs. othersFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | ACQIS, LLC | Company | Patent licensing entity — holder of US8756359B2 and 4 related bus interface patentsSearch in Eureka ↗ |
| Defendant | Fujitsu, Ltd. | Company | Japanese multinational IT hardware manufacturer — maker of PRIMERGY server product linesSearch in Eureka ↗ |
| Plaintiff counsel | Case L. Collard | Attorney | Counsel for ACQIS, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Gregory S. Tamkin | Attorney | Counsel for ACQIS, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Paige Arnette Amstutz | Attorney | Counsel for ACQIS, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Dorsey & Whitnay, LLP | Law Firm | Representing ACQIS, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Dorsey & Whitney LLP | Law Firm | Representing ACQIS, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Scott, Douglass & McConnico LLP | Law Firm | Representing ACQIS, LLCSearch in Eureka ↗ |
| Presiding judge | Judge Alan D Albright | Judge | Texas Western District CourtSearch in Eureka ↗ |
Official order — verbatim text
The stipulated dismissal language — ‘dismisses with prejudice all claims asserted by Plaintiff against Defendant’ — is unambiguous in scope: every claim across all five asserted patents is permanently extinguished as to Fujitsu. The use of Rule 41(a)(1)(A)(ii) rather than a court-ordered dismissal confirms bilateral agreement. No merits ruling was issued, meaning patent validity and infringement remain formally unadjudicated, preserving ACQIS’s enforcement position against third parties.
US8756359B2 and 4 related patents — computer bus interface architecture
The five asserted patents — US8756359B2, USRE044654E, US8977797B2, US9529768B2, and US9703750B2 — form a family cluster around computer bus interface technology, particularly serial communication architectures enabling modular peripheral connectivity in server environments. Application dates span 2013 to 2014, placing the inventions in the era of PCIe and USB 3.0 adoption in enterprise server design. USRE044654E is a reissue patent, indicating the original claims were broadened or corrected through USPTO reissue proceedings.
This portfolio is strategically significant for any vendor selling modular server hardware that routes PCIe, USB, or equivalent serial bus signals between blades, compute modules, or peripheral expansion cards. Fujitsu’s PRIMERGY CX (multi-node), MX (modular), RX (rack), and TX (tower) lines all incorporate bus interface architectures that ACQIS contended fell within the asserted claims. ACQIS has a documented history of asserting this portfolio across multiple OEMs, making freedom-to-operate analysis essential for any server hardware company with comparable interconnect designs.
Should your server hardware team run an FTO against US8756359B2 and related patents?
Any organisation designing or selling server hardware incorporating PCIe, USB, or serial bus interconnects between modular compute components should assess exposure to the ACQIS portfolio. The five patents in this case cover architectural and protocol-level claims that may read broadly across blade, rack, and modular server form factors — not just the specific PRIMERGY configurations Fujitsu sold. The inclusion of a reissue patent (USRE044654E) further widens the potential claim scope.
PatSnap Eureka’s FTO Search Agent can map the independent and dependent claims of each asserted patent against your product’s bus interface architecture, identify prior art relevant to validity challenges, and surface any continuation or related applications still pending. Given ACQIS’s active enforcement history across multiple OEMs, a structured FTO review before product launch or market expansion is a commercially prudent step for engineering and IP teams alike.
Run a freedom-to-operate analysis on US8756359B2 to assess your product’s exposure
Run FTO in Eureka →Similar computer bus interface patent cases in W.D. Texas and beyond
Explore related patent infringement actions involving computer bus interface and server interconnect technology litigated in the Western District of Texas and comparable venues.
What this case signals for the server hardware IP licensing landscape
A five-patent assertion dismissed with prejudice in under 13 months raises questions about licensing strategy, claim strength, and OEM exposure.
ACQIS’s bus interface portfolio remains live against non-Fujitsu targets
Dismissal with prejudice binds only ACQIS and Fujitsu. The five asserted patents — including reissue USRE044654E — retain full enforceability against any other server OEM or component vendor. Companies selling PCIe or USB-connected server modules should treat this case as a signal of active assertion activity, not portfolio retirement.
W.D. Texas under Judge Albright remains a high-velocity patent venue
Filing in the Western District of Texas before Judge Albright signals plaintiff intent to move quickly through scheduling and claim construction. The 388-day resolution here is consistent with pre-claim-construction settlement, suggesting defendants face strong early pressure to negotiate. In-house teams should anticipate accelerated timelines if served in this venue.
ACQIS v Fujitsu — key questions answered
Dismissal with prejudice under Rule 41(a)(1)(A)(ii) permanently bars ACQIS from reasserting the five patent claims against Fujitsu on the accused PRIMERGY products. The dismissal operates as a final judgment on the merits without a trial. ACQIS retains the right to enforce these patents against other defendants.
ACQIS asserted five patents: US8756359B2, USRE044654E (a reissue patent), US8977797B2, US9529768B2, and US9703750B2. All relate to computer bus interface technology. The accused products were Fujitsu’s PRIMERGY CX, MX, RX, and TX server lines.
W.D. Texas under Judge Alan Albright became a preferred venue for patent plaintiffs due to its fast scheduling, plaintiff-friendly procedural posture, and high patent case volume. Filing there typically accelerates claim construction and discovery timelines, increasing settlement pressure on defendants early in the case lifecycle.
No. A Rule 41(a)(1)(A)(ii) dismissal with prejudice does not constitute a ruling on patent validity or infringement. The patents remain presumptively valid and fully enforceable against any party other than Fujitsu. No IPR, reexamination, or invalidity ruling was issued in this case.
USRE044654E is a reissue patent — meaning the original patent’s claims were amended through a USPTO reissue proceeding, typically to broaden or correct claim scope. Reissue patents carry additional prosecution history that can affect claim construction and estoppel arguments. Its inclusion in a five-patent assertion against a major server OEM suggests ACQIS viewed the broadened reissue claims as central to its infringement theory.
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