Patent Armory v. United Airlines: Five Routing Patents, 53-Day Exit
Patent Armory, Inc. asserted five patents covering intelligent call routing, telephony control, and auction-based entity matching against United Air Lines, Inc. in the Northern District of Illinois. The plaintiff voluntarily dismissed the case without prejudice just 53 days after filing — before United Airlines had answered the complaint — leaving all claims formally unresolved and the door open to refiling.
Filing to Voluntary dismissal in 53 days
53 days — well below the median district court patent case duration of 2–3 years
Voluntarily dismissed: what the Rule 41 exit means for both parties
Rule 41(a)(1)(A)(i): plaintiff’s unilateral exit right
Under Federal Rule of Civil Procedure 41(a)(1)(A)(i), a plaintiff may dismiss an action without a court order at any time before the defendant has served an answer or a motion for summary judgment. Patent Armory exercised this right after 53 days. The filing explicitly states dismissal without prejudice, meaning no merits adjudication occurred and the claims are not extinguished.
Pre-answer voluntary dismissalWithout prejudice: Patent Armory retains the right to refile
A dismissal without prejudice does not bar the plaintiff from reasserting the same patents against United Airlines or other defendants in a future action. Unlike a dismissal with prejudice — which would extinguish the claims permanently — this exit preserves Patent Armory’s litigation options. The complaint itself states the dismissal is without prejudice, consistent with Rule 41(a)(1) defaults.
Claims survive; refiling possibleUnited Airlines escapes judgment — but faces lingering patent risk
United Airlines achieved a clean procedural exit without admitting liability, incurring a judgment, or producing substantive discovery. However, because the dismissal is without prejudice, the five asserted patents remain enforceable. United Airlines should monitor Patent Armory’s filing activity and assess freedom-to-operate across the asserted patent families, particularly for customer-facing telephony and routing infrastructure.
No judgment; residual IP risk remainsPre-answer exits often signal licensing negotiation or portfolio reassessment
Dismissals at this early stage — before any substantive court engagement — frequently suggest that the parties entered settlement or licensing discussions, that the plaintiff reassessed claim mapping against the defendant’s products, or that a parallel filing strategy is underway. None of these explanations can be confirmed from the public record. Companies operating intelligent telephony, IVR, or call routing platforms should treat these five patents as active monitoring targets.
Watch for refiling or licensing activityFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Patent Armory, Inc. | Company | Search in Eureka ↗ |
| Defendant | United Air Lines, Inc. | Company | Search in Eureka ↗ |
| Plaintiff counsel | Isaac Philip Rabicoff | Attorney | Counsel for Patent Armory, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Rabicoff Law LLC | Law Firm | Representing Patent Armory, Inc.Search in Eureka ↗ |
| Defendant counsel | Benjamin T. Horton | Attorney | Counsel for United Air Lines, Inc.Search in Eureka ↗ |
| Defendant counsel | John Joseph Lucas | Attorney | Counsel for United Air Lines, Inc.Search in Eureka ↗ |
| Defendant law firm | Marshall Gerstein & Borun LLP | Law Firm | Representing United Air Lines, Inc.Search in Eureka ↗ |
| Presiding judge | Judge Joan H. Lefkow | Judge | Illinois Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) and expressly states the action is withdrawn without prejudice. Because United Airlines had not yet answered the complaint or moved for summary judgment, no court order was required and no merits adjudication occurred. The without-prejudice designation is legally significant: it preserves Patent Armory’s right to reassert all five patents in a future action, either in the same court or another jurisdiction, subject to applicable statutes of limitations.
US9456086B1 and four further patents — intelligent call routing and telephony
The five asserted patents span two core technology clusters: intelligent communication routing (US9456086B1, US10491748B1, US10237420B1) and telephony control with auction-based entity matching (US7269253B1, US7023979B1). These patents cover methods and systems for dynamically routing calls or communications based on contextual data, as well as auction-style matching of callers to agents or service entities. The application dates range from the early 2000s to the mid-2010s, reflecting a portfolio that spans both legacy and more modern telephony architectures.
For airlines and large enterprise contact centres, these patents are commercially significant because intelligent routing and dynamic agent-matching are foundational to modern IVR and omnichannel customer-service platforms. The breadth of the portfolio — five patents across two distinct but related technical domains — suggests deliberate portfolio construction aimed at maximising claim coverage across enterprise telephony deployments. Companies that have upgraded or cloud-migrated their contact-centre infrastructure in the past decade may face the widest exposure.
Should you run an FTO against US9456086B1 and the four co-asserted patents?
Any enterprise deploying intelligent call routing, IVR systems, or auction-based agent-matching technology — particularly in high-volume customer-service environments like airlines, insurers, or financial services — should assess freedom-to-operate against these five patents. The without-prejudice dismissal means enforcement risk persists. Product and engineering teams building or procuring contact-centre platforms should flag these patent numbers for ongoing monitoring.
PatSnap Eureka’s FTO Search Agent can map the independent claims of each of the five asserted patents against your product architecture, flag prior art that may support invalidity arguments, and identify whether any of the patents have been subject to IPR petitions or reexamination proceedings. Early FTO analysis is significantly less costly than defending a renewed infringement action — particularly one filed by an experienced patent assertion entity.
Run a freedom-to-operate analysis on US9456086B1 to assess your product’s exposure
Run FTO in Eureka →Similar call routing and telephony patent cases in federal district courts
Cases involving intelligent call routing, telephony control, and NPE assertions in the Northern District of Illinois and comparable federal venues.
What this case signals for the telephony and call routing IP landscape
Five telephony and routing patents asserted and withdrawn in 53 days. The IP risk for airlines and call centre operators has not gone away.
Pre-answer dismissals without prejudice are a known NPE tactic
Patent assertion entities frequently file, gauge defendant response, and withdraw before costly litigation begins. A voluntary dismissal at this stage does not indicate patent weakness — it may reflect strategic portfolio repositioning. Companies in the airline, telecoms, and customer-service technology sectors should treat the five asserted patents as live enforcement risks.
All five patents remain enforceable — FTO review is warranted
US9456086B1, US10491748B1, US7269253B1, US7023979B1, and US10237420B1 were not invalidated, narrowed, or disclaimed in this action. Any enterprise operating intelligent call routing, IVR, or telephony auction-matching systems should assess exposure before a renewed assertion.
Patent v United — key questions answered
Patent Armory asserted five patents: US9456086B1, US10491748B1, US7269253B1, US7023979B1, and US10237420B1. These cover intelligent communication routing systems, telephony control with intelligent call routing, and auction-based entity matching methods — all relevant to enterprise contact-centre and IVR operations.
The public record does not disclose the reason for dismissal. Patent Armory filed a Rule 41(a)(1)(A)(i) notice after 53 days, before United Airlines had answered the complaint. This type of pre-answer exit may reflect licensing discussions, strategic portfolio reassessment, or a decision to refile in a different venue. No merits adjudication occurred.
No. A dismissal without prejudice does not extinguish the underlying patent claims. Patent Armory retains the right to refile the same action against United Airlines or to assert the same five patents against other defendants, subject to any applicable statutes of limitations. United Airlines faces ongoing enforcement risk until the patents expire or are invalidated.
Federal Rule of Civil Procedure 41(a)(1)(A)(i) allows a plaintiff to voluntarily dismiss an action without a court order by filing a notice of dismissal before the defendant serves an answer or a motion for summary judgment. In patent cases, this mechanism is frequently used by patent assertion entities to exit early without prejudicing future enforcement options. The dismissal is without prejudice by default unless stated otherwise.
The complaint targeted technology falling within the categories of intelligent communication routing systems, telephony control systems with intelligent call routing, and auction-based entity matching — all consistent with contact-centre, IVR, and customer-service routing infrastructure. The public record does not identify specific United Airlines products or systems by name.
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