Linfo IP LLC v. Air Oasis LLC — Voluntary Dismissal Without Prejudice in 18 Days
Linfo IP LLC filed a patent infringement action against Air Oasis LLC in the Northern District of Texas, asserting US9092428B1 covering systems and methods for discovering and presenting information in text content. The case closed just 18 days after filing when Linfo IP voluntarily dismissed all claims without prejudice, before Air Oasis had answered or moved for summary judgment.
Early voluntary exit leaves Air Oasis exposed to re-filing risk
On 19 December 2024, Linfo IP LLC filed Case No. 3:24-cv-03190 in the Northern District of Texas before Judge Ed Kinkeade, asserting infringement of US9092428B1 — a patent covering a system, methods and user interface for discovering and presenting information in text content — against Air Oasis LLC. No details of the accused products or specific claims in suit were made public before the dismissal.
On 6 January 2025, Linfo IP filed a notice of voluntary dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(i), explicitly stating the dismissal is without prejudice as to the asserted patent. Because Air Oasis had neither filed an answer nor a motion for summary judgment, Linfo IP was entitled to dismiss as of right. Each party was ordered to bear its own costs, expenses and attorneys’ fees.
The 18-day lifespan is strikingly short, even for patent actions that resolve pre-answer. Whether the dismissal reflects an out-of-court licensing arrangement, a decision to re-file in a different venue, or a strategic pause is not disclosed in the public record. The without-prejudice designation means Linfo IP retains the ability to assert US9092428B1 against Air Oasis again, leaving the underlying dispute formally unresolved.
Filing to Voluntary dismissal in 18 days
Closed in 18 days — well below the district median for patent cases.
Voluntarily dismissed: what the without-prejudice ruling means for both parties
Rule 41(a)(1)(A)(i): dismissal as of right, no court order needed
Federal Rule 41(a)(1)(A)(i) permits a plaintiff to dismiss an action without a court order at any time before the defendant serves an answer or a motion for summary judgment. Linfo IP exercised this right on Day 18. Because no judicial ruling on the merits was issued, there is no res judicata bar, and the case can be refiled in any competent federal court.
No merits adjudicationWithout prejudice: the case is closed but the door remains open
A dismissal without prejudice means Linfo IP has not waived its right to reassert US9092428B1 against Air Oasis in a future action. A dismissal with prejudice, by contrast, would permanently bar re-litigation of the same claims. The public record is silent on whether any side agreement — such as a licence or covenant not to sue — was reached; the dismissal notice itself does not disclose one.
Re-filing remains possibleAir Oasis avoids judgment — but faces continued exposure
Air Oasis escaped this particular action without a merits ruling and without any public admission of liability. The costs-bear-own-costs provision means no fee award in either direction. However, the without-prejudice dismissal provides no permanent protection: Linfo IP may reassert the same patent in the same or a different venue, and Air Oasis has no estoppel shield from this proceeding.
No permanent resolutionShort lifecycle signals strategic flexibility — monitor for re-filing
Patent assertion entities filing and quickly withdrawing cases without prejudice may signal active licensing negotiations, a venue strategy shift, or portfolio pruning. Companies in the text-content discovery and information retrieval space should monitor US9092428B1 for continuation filings, IPR petitions, and any re-filed district court actions to assess whether this dismissal is a pause rather than an exit.
Watch for re-assertionFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Linfo IP LLC | Company | Patent assertion entity — holder of US9092428B1 covering text-content discovery systemsSearch in Eureka ↗ |
| Defendant | Air Oasis LLC | Company | Air Oasis LLC — air purification product company named as defendant in text-content patent suitSearch in Eureka ↗ |
| Plaintiff counsel | William P. Ramey , III | Attorney | Counsel for Linfo IP LLCSearch in Eureka ↗ |
| Plaintiff law firm | Ramey LLP | Law Firm | Representing Linfo IP LLCSearch in Eureka ↗ |
| Presiding judge | Judge Ed Kinkeade | Judge | Texas Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) and explicitly designates the termination as without prejudice as to the asserted patent — US9092428B1. This phrasing is deliberately narrow: it preserves Linfo IP’s right to reassert the specific patent rather than granting any broader release. The absence of a merits ruling means no claim construction, no invalidity determination, and no finding of non-infringement entered the public record. Air Oasis holds no estoppel protection from this proceeding.
US9092428B1 — System and methods for discovering and presenting information in text
US9092428B1, filed under application number US13/709827, protects a system, methods and user interface for discovering and presenting information embedded in text content. This domain sits at the intersection of natural language processing, information retrieval, and interactive UI design. The patent’s claim scope — as asserted by Linfo IP — suggests coverage over software that identifies and surfaces contextually relevant information from within text, a function increasingly common in SaaS, enterprise search, and content platforms.
For the text-content discovery and information retrieval sector, US9092428B1 represents a meaningful assertion risk because the underlying functionality — surfacing structured information from unstructured text — is foundational to modern AI-powered search, document analysis, and knowledge management tools. The fact that this action was dismissed without prejudice rather than with prejudice or by settlement with a covenant not to sue means the patent remains a live enforcement instrument against Air Oasis and potentially other technology vendors.
Should you run an FTO against US9092428B1?
Any R&D or product team building systems that parse, index, or surface information from text content — including enterprise search tools, document intelligence platforms, NLP pipelines, or content discovery UIs — should assess whether their implementation falls within the claim scope of US9092428B1. The without-prejudice dismissal in this case confirms the patent remains enforceable and actively held by a patent assertion entity with a demonstrated willingness to litigate.
PatSnap Eureka’s FTO Search Agent allows you to map US9092428B1’s claim language against your product’s feature set, identify related family members filed under application US13/709827, and surface prior art that could support an invalidity position. Running a proactive FTO now — before a demand letter arrives — is significantly less costly than responding to litigation in the Northern District of Texas.
Run a freedom-to-operate analysis on US9092428B1 to assess your product’s exposure
Run FTO in Eureka →Similar patent cases: text-content discovery suits in N.D. Texas
Cases involving information retrieval and text-content discovery patents asserted by PAEs in the Northern District of Texas, including pre-answer voluntary dismissals.
What this case signals for the text-content discovery IP landscape
An 18-day lifespan and a without-prejudice exit suggest this dispute is unresolved — not concluded. Here is what IP teams should take away.
Without-prejudice dismissals do not extinguish infringement risk
The dismissal of Linfo IP v. Air Oasis is explicitly without prejudice to US9092428B1. Any company commercialising systems that discover or surface information within text content should treat this patent as actively asserted and conduct a current-claim FTO analysis before concluding the risk has passed.
Costs-bear-own provision signals no prevailing-party pressure here
The mutual costs ruling means neither party secured a fee-shifting victory under 35 U.S.C. § 285. This is consistent with an early resolution before substantive litigation costs accumulated. It also means Air Oasis cannot point to a fee award as evidence of exceptional case conduct — a consideration if future litigation arises.
Linfo v Air — key questions answered
A without-prejudice dismissal under Rule 41(a)(1)(A)(i) means Linfo IP retains the right to reassert US9092428B1 against Air Oasis in a future action. No merits ruling was issued, no claim construction was entered, and Air Oasis holds no estoppel protection. The dismissal closes the docket but does not resolve the underlying infringement dispute.
US9092428B1, filed as application US13/709827, covers a system, methods and user interface for discovering and presenting information in text content. It addresses the technical challenge of identifying and surfacing contextually relevant information from within unstructured text — relevant to enterprise search, NLP tools, document intelligence, and content discovery platforms.
The public record does not disclose the reason. The dismissal notice cites Rule 41(a)(1)(A)(i) and states each party bears its own costs. Possible explanations include out-of-court licensing discussions, a strategic decision to re-file in a different venue, or portfolio management. The without-prejudice designation is consistent with an intent to preserve future options rather than conclude the dispute permanently.
No. The dismissal notice expressly provides that each party shall bear its own costs, expenses and attorneys’ fees. No fee award was made under 35 U.S.C. § 285 or otherwise, and no court order on costs was issued. This is typical for pre-answer voluntary dismissals where litigation costs have not yet substantially accumulated.
Linfo IP LLC was represented by William P. Ramey III of Ramey LLP, a Texas-based firm with an extensive record of patent assertion filings across multiple technology domains. No defendant counsel entry appears on the public docket for this case, consistent with the action closing before Air Oasis filed a formal response.
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