RealTime Data v. Fujitsu & Quantum: Six-Patent Compression Dispute Ends with Prejudice
RealTime Data, LLC brought a six-patent infringement action against Fujitsu and Quantum Corporation in the Northern District of California, targeting an extensive portfolio of deduplication backup appliances. After nearly seven years of litigation, the parties jointly stipulated to dismiss all claims with prejudice — each side bearing its own costs.
Nearly 7-year data storage IP battle ends in stipulated dismissal
RealTime Data, LLC filed this infringement action on April 14, 2017 in the Northern District of California against Fujitsu, Ltd. and Quantum Corporation. The complaint asserted six patents — US9054728B2, US9116908B2, US8643513B2, US7415530B2, US7161506B2, and US7378992B2 — covering data compression and deduplication technology. The accused products spanned Quantum’s entire DXi appliance line (from the DXi 2500 through the DXi 8500), Q-Cloud Protect, GoProtect Software, and a broad range of Fujitsu Eternus storage and data-protection platforms.
The case closed on February 12, 2024, when the parties filed a joint stipulation under Federal Rule of Civil Procedure 41, agreeing to dismiss RealTime Data’s complaint and all causes of action with prejudice. The court approved the stipulation, and each party was ordered to bear its own fees and costs. A with-prejudice dismissal is final: RealTime Data is permanently barred from reasserting the same claims against these defendants on the same patents.
At 2,495 days — nearly six years and ten months — the case’s duration suggests the parties navigated substantial procedural complexity, likely including claim construction, inter partes review proceedings, and discovery disputes, before reaching resolution. The absence of a reported settlement payment and the mutual cost-bearing arrangement may indicate that patent validity challenges eroded the asserted claims’ value over time, though the public record is silent on the precise terms that drove the parties to stipulate dismissal rather than proceed to trial.
Filing to dismissal in 2495 days
2,495 days — well above the median for multi-patent district court infringement cases
Stipulated dismissal with prejudice — what the Rule 41 order means
Rule 41 stipulated dismissal: a negotiated exit, not a court ruling
A dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(ii) occurs when all parties sign a stipulation and the court approves it. No judge decided the merits here — the parties agreed to end the case. This mechanism is commonly used when the commercial rationale for continuing litigation dissolves, whether through licensing resolution, patent invalidation risk, or changed business circumstances.
FRCP 41 — joint stipulationWith prejudice means permanent: no second bite at these patents
Unlike a without-prejudice dismissal — which preserves the plaintiff’s right to refile — a with-prejudice dismissal operates as a final judgment on the merits. RealTime Data cannot reassert US9054728B2, US9116908B2, US8643513B2, US7415530B2, US7161506B2, or US7378992B2 against Fujitsu or Quantum in any future action. For defendants, this provides durable legal certainty on the specific patents and accused products covered by the complaint.
Permanent bar on refilingMutual cost-bearing: no prevailing party declared
The stipulation expressly provides that all parties bear their own attorneys’ fees and costs. In patent cases, fee-shifting under 35 U.S.C. § 285 requires a court finding that the case is ‘exceptional.’ The absence of any fee award here is consistent with a negotiated resolution where neither side sought — or could sustain — an exceptionality finding. This outcome is neutral on the question of which party held the stronger litigation position.
No § 285 fee awardSix patents, 20+ products: a broad assertion strategy
RealTime Data’s assertion covered six patents across three application families and targeted more than twenty distinct storage products from two defendants. Broad, multi-patent assertions of this type typically signal a licensing-focused litigation strategy. The with-prejudice resolution without reported compensation, combined with the extended timeline, suggests that defendants’ invalidity and non-infringement positions — potentially strengthened by USPTO proceedings — may have significantly narrowed the viable claim set before settlement talks concluded.
Multi-patent licensing assertionFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | RealTime Data, LLC | Company | Data compression licensing entity — holder of US9054728B2 and five related patentsSearch in Eureka ↗ |
| Defendant | Fujitsu, Ltd. | Company | Fujitsu, Ltd.: global IT infrastructure and storage systems manufacturer; Quantum Corp.: enterprise data protection appliance makerSearch in Eureka ↗ |
| Plaintiff counsel | Andrea Leigh Fair | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Brian David Ledahl | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Plaintiff counsel | C. Jay Chung | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jay Chung | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jeffrey Zhi Yang Liao | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Marc Aaron Fenster | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Nancy Claire Abernathy | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Paul Anthony Kroeger | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Reza Mirzaie | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Thomas John Ward , Jr. | Attorney | Counsel for RealTime Data, LLCSearch in Eureka ↗ |
| Defendant counsel | Andy Tindel | Attorney | Counsel for Fujitsu, Ltd.Search in Eureka ↗ |
| Defendant counsel | Bryan Joseph Wilson | Attorney | Counsel for Fujitsu, Ltd.Search in Eureka ↗ |
| Defendant counsel | Daniel Clayton Hubin | Attorney | Counsel for Fujitsu, Ltd.Search in Eureka ↗ |
| Defendant counsel | Rudolph Kim | Attorney | Counsel for Fujitsu, Ltd.Search in Eureka ↗ |
| Defendant counsel | Sorin Gabriel Zaharia | Attorney | Counsel for Fujitsu, Ltd.Search in Eureka ↗ |
| Defendant counsel | W. Stella Mao | Attorney | Counsel for Fujitsu, Ltd.Search in Eureka ↗ |
| Presiding judge | Judge Sallie Kim | Chief Judge | California Northern District Court — Chief JudgeSearch in Eureka ↗ |
Stipulation of dismissal — official text
The stipulation’s operative language — dismissing ‘all causes of action set forth therein, or that could have been set forth therein’ — is notably broad. The phrase ‘could have been set forth therein’ suggests the parties intended to foreclose not only the six asserted patents but also any related claims RealTime Data might have contemplated adding. For Fujitsu and Quantum, this broad release language provides stronger preclusion protection than a narrowly worded dismissal, though its precise scope in future proceedings would be subject to judicial interpretation.
US9054728B2 and five related patents — data compression and deduplication
The six patents asserted in this case — spanning application numbers filed between 2003 and 2014 — relate to RealTime Data’s core portfolio covering methods and systems for data compression, encoding, and deduplication. The patents progress from foundational compression architecture (US7161506B2, US7415530B2) through later refinements addressing specific encoding techniques (US8643513B2, US7378992B2) to more recent application-layer compression implementations (US9116908B2, US9054728B2). This family structure is consistent with a continuation strategy designed to maintain patent coverage as commercial implementations of compression technology evolved.
Data deduplication and compression are foundational to modern backup and storage appliance design — the precise technical domain occupied by Quantum’s DXi product line and Fujitsu’s Eternus CS series. Any storage vendor offering inline or post-process deduplication, variable-block chunking, or delta compression should assess exposure to this patent family. RealTime Data’s litigation history across multiple defendants suggests an active licensing programme targeting the enterprise storage sector specifically, making these patents a material IP risk for competitors in adjacent product categories.
Should your storage product team run an FTO against RealTime Data’s compression patents?
Any organisation developing or commercialising deduplication appliances, backup software with compression features, or cloud-connected data protection platforms should treat RealTime Data’s US9054728B2 family as a live clearance priority. The breadth of accused products in this case — ranging from hardware appliances to virtual and cloud-delivered solutions like Q-Cloud Protect — indicates that both on-premises and SaaS-delivered compression implementations may fall within the asserted claim scope. The with-prejudice dismissal covers only Fujitsu and Quantum; third-party vendors remain fully exposed.
PatSnap Eureka’s FTO Search Agent can map the independent and dependent claims of each of the six asserted patents against your product’s technical architecture, flagging specific claim elements that may read on deduplication pipeline design, compression algorithm selection, or data encoding methods. Claim monitoring alerts on this patent family — and on any continuations RealTime Data may yet file — allow R&D and legal teams to track scope changes before a demand letter arrives, not after.
Run a freedom-to-operate analysis on US9054728B2 to assess your product’s exposure
Run FTO in Eureka →Similar data compression and deduplication patent cases in federal courts
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What this case signals for the data storage and compression IP landscape
A seven-year, six-patent dispute ending with prejudice carries clear implications for how deduplication technology vendors manage IP exposure.
Deduplication appliance makers face persistent assertion risk from compression NPEs
RealTime Data has pursued data compression patents across numerous defendants and jurisdictions. Storage vendors offering deduplication, delta compression, or tiered caching features should treat compression IP as an ongoing litigation risk category — not a one-time clearance exercise. Regular FTO reviews tied to product release cycles are advisable.
With-prejudice exits after multi-year litigation often reflect patent validity erosion
When a plaintiff agrees to dismiss with prejudice and absorb its own costs after years of litigation, it typically suggests that the patent portfolio’s enforceability was materially weakened — often through IPR, ex parte reexamination, or adverse claim construction rulings. Defendants in similar NPE cases should prioritise USPTO challenge filings early to maximise this leverage.
RealTime v Fujitsu — key questions answered
RealTime Data, LLC sued Fujitsu, Ltd. and Quantum Corporation in the Northern District of California in April 2017, asserting six data compression patents against more than twenty storage appliance products. The case was dismissed with prejudice by joint stipulation on February 12, 2024, with all parties bearing their own costs. No damages award or settlement payment is reported in the public record.
RealTime Data asserted US9054728B2, US9116908B2, US8643513B2, US7415530B2, US7161506B2, and US7378992B2 — all drawn from its data compression and deduplication patent portfolio. These patents span application dates from approximately 2003 to 2014 and cover compression system architecture, encoding methods, and data deduplication techniques.
A dismissal with prejudice is a final adjudication that bars the plaintiff from filing a new lawsuit asserting the same claims against the same defendants. In patent cases, this means RealTime Data cannot reassert the six patents from this case against Fujitsu or Quantum. It does not prevent RealTime Data from suing other defendants on the same patents.
Accused Quantum products included the DXi 2500, 3500, 4500, 4700, 6500, 6800, 6900, 7500, and 8500 deduplication appliances, DXi V-Series, Q-Cloud Protect, Quantum DXi Accent, and GoProtect Software. Accused Fujitsu products included the Eternus CS 200c, CS 800, CS 8000, CS HE, Eternus DX, and LT Data Protection Appliances.
The public record does not specify the causes of the extended timeline. However, cases involving six asserted patents and multiple defendants typically involve prolonged claim construction proceedings, USPTO inter partes review challenges, extensive discovery, and potential appeals of interlocutory rulings. The nearly 2,500-day duration is consistent with these procedural complexities, though the specific events that drove the timeline in this case are not disclosed in the filed stipulation.
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