Crystal Mountain Communications v. D-Link: Wireless Patent Dispute Ends in Dismissal With Prejudice
Crystal Mountain Communications, LLC filed suit against D-Link Corporation in the Eastern District of Texas asserting three wireless networking patents against D-Link’s 5G modem and WiFi 6 capable devices. The parties announced a resolution to the Court after 308 days, resulting in a dismissal with prejudice — each side bearing its own fees and costs.
Three Wireless Patents, One Early Resolution: Crystal Mountain vs. D-Link
On February 5, 2024, Crystal Mountain Communications, LLC filed an infringement action against D-Link Corporation in the U.S. District Court for the Eastern District of Texas before Judge Amos L. Mazzant. The complaint asserted three patents — US7746824B2, US7266121B2, and US7103313B2 — targeting D-Link’s devices equipped with 5G modems and WiFi 6 capability, two of the most commercially significant wireless connectivity standards in the current consumer and enterprise networking markets.
The case closed on December 9, 2024, after 308 days, when both parties announced to the Court that they had resolved Crystal Mountain’s claims. The Court granted the joint request and dismissed all of Crystal Mountain’s claims against D-Link with prejudice. Crucially, the dismissal order specifies that each party bears its own attorneys’ fees, costs, and expenses — a standard mutual-cost structure consistent with a negotiated resolution rather than a contested judgment.
A resolution reached within roughly ten months of filing in the Eastern District of Texas — before any trial date — suggests the parties likely reached a licensing agreement or other commercial settlement, though the public record does not confirm specific terms. The with-prejudice dismissal forecloses Crystal Mountain from reasserting these three patents against D-Link in future litigation, which may indicate the dispute has been fully and finally resolved between these specific parties.
Filing to Dismissed with Prejudice in 308 days
308 days from filing to closure — below the typical 18–24 month E.D. Texas patent trial cycle, suggesting early resolution
Dismissed with prejudice: what the resolution means for both parties
Dismissed with prejudice bars Crystal Mountain from refiling
A dismissal with prejudice is a final adjudication on the merits for procedural purposes. Crystal Mountain cannot refile these three patent claims against D-Link in any federal court. The parties jointly requested this dismissal, signalling a negotiated resolution. Under Rule 41, a voluntary dismissal with prejudice following a joint announcement of resolution is the standard mechanism used to close patent infringement cases that have settled or been licensed.
Final — no refiling permittedCrystal Mountain exits with no public admission of non-infringement
The dismissal order contains no finding of invalidity, non-infringement, or unenforceability. Crystal Mountain’s three patents remain in force against third parties. The with-prejudice bar applies only to D-Link. This structure is consistent with a licensing arrangement where the plaintiff receives consideration in exchange for releasing its claims — though the terms remain confidential and the public record does not confirm any payment.
Patents survive vs. third partiesD-Link resolves exposure on 5G and WiFi 6 product lines
D-Link secured a with-prejudice dismissal, permanently shielding its 5G modem and WiFi 6 device portfolio from further claims under these three patents by Crystal Mountain. The mutual cost-bearing arrangement — each party paying its own fees — is typical of negotiated settlements and avoids any exceptional-case fee award. D-Link bears no public finding against it, preserving its commercial and reputational position in the networking market.
Clean exit — no adverse findingThree wireless patents remain live risks for other 5G and WiFi 6 manufacturers
US7746824B2, US7266121B2, and US7103313B2 are not invalidated or narrowed by this resolution. Other manufacturers of 5G modem-equipped or WiFi 6 capable devices face the same potential exposure that brought D-Link to the negotiating table. The Eastern District of Texas remains a preferred venue for wireless patent assertions, and Crystal Mountain’s willingness to resolve quickly may signal an active licensing programme targeting the broader networking device sector.
Active risk for WiFi 6 / 5G makersFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Crystal Mountain Communications, LLC | Company | Wireless networking patent assertion entity — holder of US7746824B2, US7266121B2, and US7103313B2Search in Eureka ↗ |
| Defendant | D-Link, Corp. | Company | D-Link Corporation — global manufacturer of consumer and enterprise networking devices including 5G and WiFi 6 productsSearch in Eureka ↗ |
| Plaintiff counsel | Hannah D. Price | Attorney | Counsel for Crystal Mountain Communications, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Larry Dean Thompson , Jr. | Attorney | Counsel for Crystal Mountain Communications, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Matthew J. Antonelli | Attorney | Counsel for Crystal Mountain Communications, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Rehan Mohammed Safiullah | Attorney | Counsel for Crystal Mountain Communications, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Zachariah Harrington | Attorney | Counsel for Crystal Mountain Communications, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Antonelli, Harrington & Thompson, LLP | Law Firm | Representing Crystal Mountain Communications, LLCSearch in Eureka ↗ |
| Defendant counsel | Christine Yang | Attorney | Counsel for D-Link, Corp.Search in Eureka ↗ |
| Defendant counsel | David C. Miller | Attorney | Counsel for D-Link, Corp.Search in Eureka ↗ |
| Defendant counsel | Victoria D. Hao | Attorney | Counsel for D-Link, Corp.Search in Eureka ↗ |
| Defendant law firm | Bradley Arant Boult Cummings LLP (Dallas) | Law Firm | Representing D-Link, Corp.Search in Eureka ↗ |
| Defendant law firm | Law Offices of S J Christine Yang | Law Firm | Representing D-Link, Corp.Search in Eureka ↗ |
| Presiding judge | Judge Amos L. Mazzant | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The order’s language — ‘announced to the Court that they have resolved Plaintiff’s claims’ — is the standard formulation for a negotiated resolution disclosed to the court without public disclosure of financial terms. The with-prejudice dismissal is final and operates as a bar to any future suit by Crystal Mountain against D-Link on these three patents. The mutual cost-bearing provision is notable: it signals neither party conceded an ‘exceptional case’ under 35 U.S.C. § 285, and no fee-shifting was sought or ordered. The patents’ validity and scope are entirely unaddressed by this order.
US7746824B2, US7266121B2 & US7103313B2 — Wireless Networking Technology Patents
The three patents at issue — US7746824B2 (App. No. 11/125132), US7266121B2 (App. No. 10/329750), and US7103313B2 (App. No. 10/161657) — cover wireless communication technologies with application numbers suggesting filing dates in the early-to-mid 2000s, a period when foundational wireless LAN and multi-channel communication architectures were being established. Their assertion against 5G modem and WiFi 6 devices indicates Crystal Mountain alleges these older patents cover core protocol or stack-level functionality still implemented in current-generation wireless standards.
Asserting patents from this vintage against WiFi 6 (802.11ax) and 5G NR devices is a commercially significant strategy: if the claims read on fundamental transmission or channel-access methods embedded in modern chipsets, essentially every device manufacturer using these standards faces potential exposure. The resolution with D-Link without a validity ruling leaves the enforceability and scope of all three patents entirely open — a material risk for other OEMs integrating these wireless standards into consumer, enterprise, or IoT device product lines.
Should your 5G or WiFi 6 product team run an FTO against these three patents?
Any organisation designing, manufacturing, or distributing devices that incorporate 5G modem functionality or WiFi 6 (802.11ax) capability should treat this case as a direct signal. Crystal Mountain successfully brought D-Link to resolution in under a year, and the three asserted patents remain fully in force against all other parties. OEMs, chip integrators, and platform vendors in the wireless networking supply chain face real and unresolved exposure.
PatSnap Eureka’s FTO Search Agent can map the claims of US7746824B2, US7266121B2, and US7103313B2 against your specific product architecture — identifying which claims, if any, read on your implementation and flagging prior art that could support an invalidity position. Running this analysis before litigation risk materialises is substantially less costly than defending an E.D. Texas infringement action.
Run a freedom-to-operate analysis on US7746824B2 to assess your product’s exposure
Run FTO in Eureka →Similar wireless networking patent cases in the Eastern District of Texas
Explore related patent infringement actions asserting wireless networking and WiFi/5G patents in the Eastern District of Texas before Judge Mazzant and comparable tribunals.
What this case signals for the wireless networking IP landscape
A fast resolution in E.D. Texas against a major networking OEM over 5G and WiFi 6 patents carries clear signals for the broader industry.
Eastern District resolutions under one year suggest active licensing programs
Cases filed in E.D. Texas that settle within 308 days — well ahead of the typical trial schedule — are consistent with a patent holder operating a structured licensing strategy. For networking OEMs, this pattern suggests Crystal Mountain may pursue other 5G and WiFi 6 device makers using the same patent portfolio. Early monitoring of these three patents is advisable.
With-prejudice dismissal protects D-Link but leaves the patents fully intact
The dismissal resolves nothing about claim scope or validity. US7746824B2, US7266121B2, and US7103313B2 remain enforceable in full. Any company in the wireless networking device supply chain — chipmakers, OEM integrators, or platform vendors — that has not conducted an FTO analysis against these patents should treat this case as a trigger to do so.
Crystal v D-Link — key questions answered
A dismissal with prejudice is a final resolution of Crystal Mountain’s claims against D-Link under US7746824B2, US7266121B2, and US7103313B2. D-Link cannot be sued again by Crystal Mountain on these three patents. However, the dismissal contains no finding on patent validity or non-infringement, so the patents remain enforceable against other defendants.
Crystal Mountain asserted three patents: US7746824B2 (App. No. 11/125132), US7266121B2 (App. No. 10/329750), and US7103313B2 (App. No. 10/161657). All three were asserted in connection with D-Link’s devices featuring 5G modems and WiFi 6 capability in the Eastern District of Texas.
The case closed in 308 days, which is faster than the typical 18–24 month trajectory for patent trials in the Eastern District of Texas. This timeline is consistent with early-stage settlement negotiations, potentially a licensing arrangement. The joint announcement to the Court and the mutual cost-bearing structure both suggest a negotiated commercial resolution rather than a contested dismissal.
No. The Court’s order makes no finding on the validity, scope, or enforceability of any of the three patents. All three remain in full force and can be asserted against other manufacturers of 5G modem or WiFi 6 devices. The dismissal only forecloses Crystal Mountain from suing D-Link again on these specific patents.
The Court ordered that all attorneys’ fees, court costs, and expenses are borne by the party that incurred them. No fee-shifting was ordered under 35 U.S.C. § 285. This mutual cost structure is standard in negotiated patent settlements and indicates neither party sought nor obtained an ‘exceptional case’ designation.
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