Crystal Mountain v. TP-Link: Three Wireless Patents, Dismissed With Prejudice
Crystal Mountain Communications, LLC asserted three wireless communication patents against TP-Link’s 5G modem and WiFi 6 devices in the Eastern District of Texas. The plaintiff voluntarily dismissed all claims with prejudice after 225 days — before TP-Link filed any answer — permanently extinguishing its right to re-litigate these patents against this defendant.
Three Wireless Patents, One Early Exit: A Pre-Answer Dismissal
On February 5, 2024, Crystal Mountain Communications, LLC filed an infringement action in the U.S. District Court for the Eastern District of Texas (Case No. 4:24-cv-00098) before Judge Amos L. Mazzant. The suit targeted TP-Link Corp., Ltd. and TP-Technologies Co., Ltd., alleging infringement of three wireless communication patents — US7746824B2, US7266121B2, and US7103313B2 — through TP-Link’s devices equipped with 5G modems and WiFi 6 capability.
The case closed on September 17, 2024, when Crystal Mountain filed a Notice of Voluntary Dismissal with prejudice under Fed. R. Civ. P. 41(a). Because TP-Link had not yet answered the complaint or moved for summary judgment, the dismissal was procedurally straightforward. The court ordered each side to bear its own costs, expenses, and attorney’s fees — suggesting no financial exchange was recorded in the public docket.
The 225-day duration and pre-answer timing are notable: the case resolved before substantive claim construction or invalidity briefing occurred. A with-prejudice dismissal is permanent — Crystal Mountain cannot re-assert these three patents against TP-Link in a future action. What drove the decision remains unclear from the public record; possibilities include a private settlement, a licensing arrangement, or a litigation cost-benefit reassessment, though none is confirmed.
Filing to Voluntary dismissal in 225 days
225 days — resolved pre-answer, faster than the median E.D. Tex. patent case
Dismissed with prejudice: what the voluntary exit means for both parties
Rule 41(a) dismissal with prejudice — permanent bar on refiling
Under Fed. R. Civ. P. 41(a), a plaintiff may voluntarily dismiss without court approval before the defendant answers or moves for summary judgment. Crystal Mountain invoked this mechanism but chose the ‘with prejudice’ designation — a critical distinction. Unlike a without-prejudice dismissal, this permanently bars Crystal Mountain from re-asserting US7746824B2, US7266121B2, or US7103313B2 against TP-Link in any future action.
Permanent claim barCrystal Mountain walks away — permanently, for these patents and this defendant
The with-prejudice designation is a significant concession by Crystal Mountain. It forfeits all future enforcement leverage against TP-Link on all three asserted patents. Each side bearing its own costs suggests no court-ordered fee award, but the public record does not confirm whether a private resolution accompanied the dismissal. Crystal Mountain retains the right to assert these patents against other defendants not party to this action.
No re-litigation against TP-LinkTP-Link secures permanent release — without filing an answer
TP-Link and TP-Technologies achieved a favourable result without incurring the cost of substantive litigation: no answer, no invalidity contentions, no claim construction briefing. The dismissal with prejudice provides TP-Link a permanent shield against these three patents in the hands of Crystal Mountain. The cost-bearing order, while neutral on its face, confirms no fee-shifting penalty was imposed on either party.
Full release, minimal litigation costWiFi 6 and 5G device makers: patent risk persists from other assertion targets
The dismissal removes TP-Link from the frame but leaves the three patents live and enforceable against the broader market. Companies developing or selling WiFi 6 or 5G modem-equipped devices should note that US7746824B2, US7266121B2, and US7103313B2 remain active assertion vehicles. Crystal Mountain’s litigation strategy — filing in E.D. Tex. with a focused product set — is consistent with a licensing campaign that may extend to other manufacturers.
Patents remain enforceableFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Crystal Mountain Communications, LLC | Company | Wireless IP licensing entity — holder of US7746824B2, US7266121B2, and US7103313B2Search in Eureka ↗ |
| Defendant | TP-Link Corp., Ltd. | Company | TP-Link Corp. and TP-Technologies Co. — global manufacturer of WiFi 6 and 5G modem devicesSearch in Eureka ↗ |
| Co-Defendant | TP-Technologies Co., Ltd. | Company | Search 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 | Kristopher L. Reed | Attorney | Counsel for TP-Link Corp., Ltd.Search in Eureka ↗ |
| Defendant law firm | Kilpatrick Townsend & Stockton, LLP | Law Firm | Representing TP-Link Corp., Ltd.Search in Eureka ↗ |
| Presiding judge | Judge Amos L. Mazzant | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order reflects a textbook Rule 41(a)(1) voluntary dismissal with prejudice, entered before any responsive pleading. The ‘with prejudice’ designation is plaintiff-elected, not court-imposed — making it an unusually strong concession. The mutual cost-bearing order confirms no prevailing party was designated, which forecloses a subsequent fee motion under 35 U.S.C. § 285. The three asserted patents are unaffected in scope or validity by this dismissal and remain enforceable against third parties.
US7746824B2, US7266121B2 & US7103313B2 — Wireless Communication Patents
The three patents-in-suit — US7746824B2 (App. No. 11/125132), US7266121B2 (App. No. 10/329750), and US7103313B2 (App. No. 10/161657) — were asserted against TP-Link’s 5G modem and WiFi 6 device lines. The application numbers suggest priority dates in the early 2000s, a period of foundational innovation in broadband wireless protocols. These patents likely cover aspects of wireless data transmission, channel management, or packet-based communication — technical areas directly relevant to both 802.11ax (WiFi 6) and 5G NR architectures.
Patents with early 2000s wireless communication priority dates can carry broad claim coverage over fundamental transmission techniques that underpin modern WiFi 6 and 5G implementations. For device OEMs and chipset vendors, this vintage increases the likelihood that claim language reads on current stack implementations. Crystal Mountain’s decision to assert all three patents together against a single product family — TP-Link’s 5G and WiFi 6 devices — suggests the portfolio is positioned as a bundled licensing asset, raising exposure risk for other manufacturers in the same product categories.
Should your team run an FTO against US7746824B2, US7266121B2 & US7103313B2?
Any company designing, manufacturing, or distributing devices with WiFi 6 or 5G modem capability should treat these three patents as active enforcement risks. Crystal Mountain’s dismissal with prejudice protects only TP-Link — every other player in the market remains fully exposed. Product teams working on 802.11ax access points, 5G routers, CPE devices, or integrated chipsets should prioritise FTO clearance against this portfolio before expanding distribution into U.S. markets.
PatSnap Eureka’s FTO Search Agent can map the claim language of US7746824B2, US7266121B2, and US7103313B2 against your product’s technical specifications, identify prior art relevant to each claim, and flag prosecution history estoppel. Eureka’s litigation monitoring layer also tracks Crystal Mountain’s filing activity, alerting your team if new defendants in the WiFi 6 or 5G space are targeted — giving you advance signal before a demand letter arrives.
Run a freedom-to-operate analysis on US7746824B2 to assess your product’s exposure
Run FTO in Eureka →Similar wireless patent cases in the Eastern District of Texas
Cases involving wireless communication patent assertions against WiFi 6 and 5G device makers in E.D. Tex., including comparable NPE enforcement patterns.
What this case signals for the wireless communications IP landscape
A pre-answer exit with prejudice in E.D. Tex. rarely ends the story — it often reshapes it for other market players.
With-prejudice exits signal deal activity or strategic portfolio repricing
When a plaintiff voluntarily dismisses with prejudice before the defendant answers, it typically signals a private resolution — licensing deal, cross-licence, or walk-away after cost reassessment. The absence of a fee award is consistent with a negotiated outcome. Competitors of TP-Link in the WiFi 6 and 5G device space should monitor Crystal Mountain for follow-on filings.
E.D. Tex. remains the preferred venue for wireless patent assertions
Crystal Mountain’s choice of the Eastern District of Texas reflects the venue’s continued attractiveness for NPE patent assertions. Judge Mazzant’s docket is active in patent cases. Companies with 5G modem or WiFi 6 product lines sold into Texas markets should audit exposure to the three asserted patents — particularly given the portfolio’s vintage application dates.
Crystal v TP-Link — key questions answered
The dismissal with prejudice permanently bars Crystal Mountain from re-asserting US7746824B2, US7266121B2, and US7103313B2 against TP-Link and TP-Technologies. TP-Link’s WiFi 6 and 5G modem device lines are fully released from these claims. The order does not affect other potential defendants or the patents’ enforceability against third parties.
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 collectively against TP-Link’s devices with 5G modems and devices with WiFi 6 capability in the Eastern District of Texas.
The public record reflects a voluntary dismissal with prejudice and a mutual cost-bearing order — neither confirms nor rules out a private settlement. The terms of any out-of-court resolution, if one occurred, are not disclosed in the court’s docket. The pattern is consistent with a negotiated licence or walkaway, but this cannot be confirmed from publicly available materials.
No. The dismissal was entered with prejudice under Fed. R. Civ. P. 41(a), which operates as a final adjudication on the merits for res judicata purposes. Crystal Mountain is permanently barred from re-asserting US7746824B2, US7266121B2, or US7103313B2 against TP-Link Corp. or TP-Technologies Co. in any future action.
Yes. A voluntary dismissal with prejudice does not affect the validity or enforceability of the asserted patents against third parties. The patents were never adjudicated on the merits, so no invalidity finding was made. Crystal Mountain retains full rights to assert all three patents against other WiFi 6 or 5G device manufacturers not party to this action.
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