Patent Armory v. Delta Air Lines: 5-Patent Call Routing Suit Dropped in 63 Days
Patent Armory, Inc. filed a five-patent infringement action against Delta Air Lines in the Delaware District Court, asserting patents covering intelligent call routing, telephony control, and auction-based entity matching. The case closed just 63 days after filing when Patent Armory voluntarily dismissed without prejudice — before Delta had filed any answer or dispositive motion.
Five-patent call routing assertion against Delta ends before Delta responds
Patent Armory, Inc. filed suit against Delta Air Lines, Inc. on December 4, 2024, in the United States District Court for the District of Delaware before Judge Maryellen Noreika. The complaint asserted five U.S. patents — US9456086B1, US10491748B1, US7269253B1, US7023979B1, and US10237420B1 — covering intelligent communication routing systems, telephony control with intelligent call routing, and auction-based entity matching methods. The accused products and systems relate to Delta’s customer communication infrastructure.
The case terminated on February 5, 2025, when Patent Armory filed a notice of voluntary dismissal without prejudice pursuant to Federal Rule of Civil Procedure 41(a)(1)(A)(i). That procedural rule permits a plaintiff to dismiss unilaterally — without a court order — so long as the defendant has not yet served an answer or a motion for summary judgment. Delta had done neither, meaning Patent Armory retained the ability to exercise this exit right as of right.
A 63-day lifespan is notably short even for early-exit patent suits in Delaware. The public record does not disclose whether a licensing negotiation, a demand letter response, a threatened invalidity challenge, or other strategic calculus drove the withdrawal. Because dismissal was without prejudice, Patent Armory retains the ability to refile the same claims — subject to applicable statutes of limitations and any future estoppel arguments — which means Delta cannot treat this closure as a final resolution of the underlying IP exposure.
Filing to Voluntary dismissal in 63 days
63 days — well below the median time-to-termination for patent suits in D. Del.
Voluntarily dismissed: what the Rule 41 exit means for both parties
FRCP 41(a)(1)(A)(i): the plaintiff’s unilateral exit right
Rule 41(a)(1)(A)(i) allows a plaintiff to dismiss an action without a court order before the defendant serves an answer or a summary judgment motion. Patent Armory exercised this right in its entirety — the dismissal required no judicial approval and carries no merits determination. The case simply ceases to exist procedurally at this stage.
No court order requiredWithout prejudice — but the record is silent on why
A ‘without prejudice’ dismissal preserves Patent Armory’s right to refile the same claims. A ‘with prejudice’ dismissal would have permanently extinguished them. The filing explicitly states ‘without prejudice,’ so refiling remains legally possible. However, the public record does not disclose whether any side agreement, licensing term, or covenant-not-to-sue alters this picture in practice. Practitioners should not assume the dispute is fully resolved.
Refiling remains possiblePatent Armory retains full enforcement optionality
Because dismissal was without prejudice, Patent Armory’s five asserted patents remain enforceable against Delta and any other party. The entity can refile in Delaware or another venue. No claim construction, no invalidity finding, and no damages ruling emerged from this case — preserving every litigation lever for a future proceeding. Whether a side agreement limits this optionality is not visible on the public docket.
Patents unimpairedDelta avoids judgment — but not permanently
Delta Air Lines escapes this particular proceeding without any adverse finding, cost award, or injunction. However, the without-prejudice nature of the dismissal means Delta faces continued latent exposure on all five asserted patents. If no private settlement or license was reached, Delta’s legal and IP teams should treat this closure as a pause, not a resolution. A second filing could arrive in any district where Delta operates or is incorporated.
Exposure not extinguishedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Patent Armory, Inc. | Company | Patent assertion entity — holder of US9456086B1 and four further call routing patentsSearch in Eureka ↗ |
| Defendant | Delta Air Lines, Inc. | Company | Delta Air Lines, Inc. — major U.S. airline with large-scale customer telephony infrastructureSearch in Eureka ↗ |
| Plaintiff counsel | Antranig N. Garibian | Attorney | Counsel for Patent Armory, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Garibian Law Offices, PC | Law Firm | Representing Patent Armory, Inc.Search in Eureka ↗ |
| Defendant counsel | Joseph A. Loy | Attorney | Counsel for Delta Air Lines, Inc.Search in Eureka ↗ |
| Defendant counsel | Karen Elizabeth Keller | Attorney | Counsel for Delta Air Lines, Inc.Search in Eureka ↗ |
| Defendant law firm | Shaw Keller LLP | Law Firm | Representing Delta Air Lines, Inc.Search in Eureka ↗ |
| Presiding judge | Judge Maryellen Noreika | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes FRCP 41(a)(1)(A)(i) and expressly confirms that Delta had not yet answered or moved for summary judgment. This phrasing is legally significant: it establishes the procedural preconditions for a unilateral, court-order-free exit and signals that Patent Armory acted at the earliest possible moment it could do so as of right. The explicit ‘without prejudice’ designation means no claim preclusion attaches. Neither party obtained a substantive ruling, leaving the validity and infringement questions entirely open.
US9456086B1 — Intelligent communication routing system
US9456086B1, filed under application number US12/719827, is the lead asserted patent and covers intelligent communication routing systems and methods — technology that determines how inbound calls or communications are directed based on dynamic criteria. The portfolio spans application dates across multiple filing windows, with patents US7023979B1 and US7269253B1 representing earlier-generation claims and US10237420B1 and US10491748B1 representing more recent continuation or related filings. Together they cover a layered stack of routing logic applicable to enterprise telephony and IVR infrastructure.
For airlines and other high-volume customer contact operations, intelligent call routing is mission-critical infrastructure. Delta’s telephony systems — handling millions of customer interactions annually — represent exactly the kind of large-scale deployment these patent claims are drafted to capture. The portfolio’s breadth across both method and system claims, combined with application dates suggesting coverage of both legacy and modernised routing architectures, makes these patents a credible enforcement tool against any major enterprise telephony operator. Competitors and vendors in the contact centre technology space should assess whether their own systems fall within the scope of these five families.
Should you run an FTO analysis against US9456086B1 and related routing patents?
Any enterprise deploying intelligent call routing, IVR-based entity matching, or AI-enhanced telephony control systems should treat this portfolio as a live clearance risk. The five patents span system and method claims, meaning both the platform vendor and the enterprise deploying the system may face exposure. Airlines, travel companies, financial institutions, and large-scale contact centre operators are the most likely next targets if Patent Armory continues its campaign.
PatSnap Eureka’s FTO Search Agent can map your product’s call routing logic against the claim language of all five asserted patents simultaneously, flag dependent and independent claim overlaps, and identify prior art that may support invalidity arguments. For in-house IP teams at airlines or contact centre vendors, running this analysis now — before any demand letter arrives — is materially cheaper than responding to a complaint in Delaware.
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 Delaware District Court
Cases involving intelligent call routing and telephony control patents asserted in the Delaware District Court — including PAE actions with multi-patent portfolios and early voluntary dismissals.
What this case signals for the enterprise telephony IP landscape
A fast voluntary dismissal against a high-profile defendant often signals strategic repositioning — not defeat. Here is what IP teams should monitor.
Pre-answer dismissals are a common PAE pressure tactic — study the portfolio
Patent assertion entities frequently file, gauge defendant posture, and withdraw before incurring significant litigation cost. The five-patent portfolio here — spanning call routing, telephony control, and entity matching — covers technology embedded in virtually every airline’s customer contact infrastructure. Any carrier operating similar systems should audit its exposure to these specific patent families now, not after a refiling.
Without-prejudice closure demands ongoing freedom-to-operate diligence
Delta’s legal team cannot treat this closure as clearance. Patent Armory’s patents remain valid and asserted on the public record. Companies in the travel, hospitality, and financial services sectors deploying intelligent call routing or IVR-based entity matching systems should run targeted FTO searches against US9456086B1, US10491748B1, US7269253B1, US7023979B1, and US10237420B1 before deploying or scaling those systems.
Patent v Delta — key questions answered
Patent Armory, Inc. sued Delta Air Lines, Inc. in the District of Delaware asserting five patents: US9456086B1, US10491748B1, US7269253B1, US7023979B1, and US10237420B1. The patents cover intelligent communication routing systems, telephony control with intelligent call routing, and auction-based entity matching — technology relevant to airline customer contact infrastructure.
Patent Armory voluntarily dismissed the case under FRCP 41(a)(1)(A)(i) on February 5, 2025, before Delta filed any answer or summary judgment motion. The public record does not disclose the reason — it could reflect a licensing negotiation, strategic repositioning, or a decision to refile elsewhere. The without-prejudice designation means the claims can be reasserted.
No. A voluntary dismissal without prejudice does not extinguish the underlying patent rights or preclude refiling. All five asserted patents remain valid on their face. Unless Delta secured a license, covenant-not-to-sue, or settlement — none of which appear on the public docket — its exposure to these patent families persists.
The portfolio covers intelligent communication routing systems and methods (US9456086B1, US10237420B1), telephony control systems with intelligent call routing (US10491748B1, US7269253B1), and auction-based entity matching methods (US7023979B1). Together they address how inbound communications are directed in enterprise telephony environments — relevant to any large-scale contact centre or IVR deployment.
The case was assigned to Judge Maryellen Noreika in the United States District Court for the District of Delaware. The case closed before any substantive judicial rulings were issued, as Patent Armory voluntarily dismissed prior to Delta filing an answer.
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