Sandstrom v. Ericsson: 4-Patent Telecom Infringement Action Voluntarily Dismissed in 103 Days
Individual inventor Mark Sandstrom sued Ericsson Inc. and its Swedish parent Telefonaktiebolaget L.M. Ericsson in the District of Minnesota, asserting four patents covering packet transport networking, dynamic switching, and binary file transfer-based network management. The case closed in just 103 days via voluntary dismissal filed before Ericsson served any answer or motion for summary judgment.
Solo inventor exits 4-patent telecom suit against Ericsson before first answer
On 19 July 2024, individual inventor Mark Sandstrom filed an infringement action in the District of Minnesota against Ericsson Inc. and Swedish parent Telefonaktiebolaget L.M. Ericsson. The complaint asserted four US patents — US10848546B2, US10567474B2, US7333511B2, and US7558260B2 — covering byte-timeslot-synchronous dynamic switching bus systems, binary file transfer-based network management, and dynamically channelizable packet transport networks, all technology domains closely aligned with Ericsson’s core telecom infrastructure portfolio.
The case closed on 30 October 2024, just 103 days after filing, when Sandstrom invoked Rule 41(a)(1)(A)(i) of the Federal Rules of Civil Procedure to voluntarily dismiss the action. That procedural mechanism is only available before the opposing party serves an answer or a motion for summary judgment, confirming that Ericsson had not yet formally responded on the merits. The public record does not specify whether the dismissal was with or without prejudice, a distinction that carries significant consequences for any future refiling.
A resolution within 103 days — before any substantive court filing by the defendant — is notably swift, even for cases that settle or are dismissed early. The timing is consistent with several scenarios: a private settlement reached before litigation costs escalated, a licensing arrangement, or a strategic withdrawal after counsel assessed claim strength against Ericsson’s likely defences. Holland & Knight and Stinson LLP represented Ericsson, suggesting the defendant fielded experienced IP litigation teams whose early involvement may have influenced the trajectory. What drove Sandstrom’s decision remains unknown from the public record.
Filing to Voluntary dismissal in 103 days
103 days — resolved before defendant answer; well below median district court patent case duration
Voluntarily dismissed: what Rule 41(a)(1)(A)(i) means for both parties
Rule 41(a)(1)(A)(i) — dismissal as of right before answer
Rule 41(a)(1)(A)(i) permits a plaintiff to dismiss an action without a court order at any time before the opposing party serves an answer or a motion for summary judgment. Sandstrom’s notice confirms Ericsson had not yet filed either. This is a unilateral plaintiff action — no judicial approval is required — making it the fastest available exit from litigation short of non-filing.
Pre-answer voluntary exitWith or without prejudice? The public record is silent
A dismissal ‘with prejudice’ bars the plaintiff from refiling the same claims; ‘without prejudice’ preserves that right. Rule 41(a)(1)(A)(i) dismissals are silent on prejudice by default — courts generally treat them as without prejudice unless a prior dismissal of the same claims exists. The public record in this case does not specify either designation, so the practical effect on Sandstrom’s ability to refile against Ericsson remains legally ambiguous.
Prejudice status unconfirmedEricsson exits without adjudication — but patents remain live
Ericsson obtained a clean exit with no adverse ruling, no injunction, and no damages award. However, all four asserted patents survive the dismissal intact — their validity and potential infringement by Ericsson’s products have never been tested on the merits. Ericsson cannot rely on this dismissal as a precedent or estoppel against future assertion of the same patents.
No merits ruling on EricssonFour telecom patents remain unadjudicated — sector risk persists
For other telecom infrastructure vendors operating in dynamic packet transport, network management, and switched bus architectures, the dismissal offers no protective precedent. The four patents asserted here — spanning technologies closely aligned with 4G/5G transport and management layers — remain enforceable. Companies evaluating FTO in these domains should treat this dismissal as neutral, not clearing, on the question of patent scope or validity.
Patents remain enforceableFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Mark Sandstrom | Individual | Individual inventor and patent holder of four telecom networking and transport patentsSearch in Eureka ↗ |
| Defendant | Ericsson, Inc. | Company | Ericsson Inc. and Swedish parent Telefonaktiebolaget L.M. Ericsson — global telecom infrastructure leadersSearch in Eureka ↗ |
| Co-Defendant | Telefonaktiebolaget L.M. Ericsson | Individual | Search in Eureka ↗ |
| Plaintiff counsel | Mark Sandstrom | Attorney | Counsel for Mark SandstromSearch in Eureka ↗ |
| Defendant counsel | Jacob Baron | Attorney | Counsel for Ericsson, Inc.Search in Eureka ↗ |
| Defendant counsel | Mark Masutani | Attorney | Counsel for Ericsson, Inc.Search in Eureka ↗ |
| Defendant counsel | Ruth A Rivard | Attorney | Counsel for Ericsson, Inc.Search in Eureka ↗ |
| Defendant law firm | Holland & Knight LLP | Law Firm | Representing Ericsson, Inc.Search in Eureka ↗ |
| Defendant law firm | Stinson LLP | Law Firm | Representing Ericsson, Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Minnesota District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) with precision, confirming the filing was made strictly before Ericsson served an answer or summary judgment motion. The declaration under penalty of perjury is standard form for pro se or self-represented plaintiff filings and reinforces that Sandstrom acted without law firm representation on the plaintiff side. No merits findings, claim constructions, or invalidity determinations emerge from this termination. The phrasing leaves the prejudice question open, which is the critical unresolved issue for both Ericsson’s future exposure and Sandstrom’s enforcement options.
US10848546B2 — Dynamically channelizable packet transport network
The four asserted patents span two distinct technical clusters. US10848546B2 and US10567474B2 address dynamically channelizable packet transport networks and direct binary file transfer-based network management systems — technologies relevant to modern carrier-grade IP transport and OSS/BSS layers. US7333511B2 and US7558260B2, with application dates in the early 2000s, cover byte-timeslot-synchronous dynamic switching bus architectures, suggesting foundational claims that may read on legacy and evolved transport infrastructure. The breadth of filing dates — from early 2000s applications to grants in the 2019–2020 timeframe — indicates a long-running prosecution strategy.
For the telecom sector, the combination of legacy switching claims and more recent packet transport patents creates a layered enforcement profile. Ericsson’s infrastructure portfolio — spanning RAN, transport, and network management — sits squarely within the technical domains these patents address. The fact that an individual inventor pursued Ericsson, one of the industry’s most IP-active defendants, with four patents across these domains suggests either a credible licensing thesis or a test of enforceability. Competitors deploying dynamic packet transport or binary file transfer-based OSS architectures should conduct independent FTO analysis against these patent families.
Should your team run an FTO against US10848546B2 and its co-asserted patents?
Any organisation deploying dynamically channelizable packet transport, byte-timeslot-synchronous switching, or binary file transfer-based network management in carrier or enterprise infrastructure should treat these four patents as active FTO candidates. The patents were asserted against one of the world’s largest telecom OEMs, confirming the patent holder views them as commercially relevant. The voluntary dismissal provides zero invalidity or non-infringement safe harbour — no claim construction or prior art ruling was issued.
PatSnap Eureka’s FTO Search Agent can map your product’s technical feature set against the independent claims of US10848546B2, US10567474B2, US7333511B2, and US7558260B2, identify relevant prior art that may support invalidity arguments, and surface any continuation or family members that extend the patent coverage footprint. For R&D teams working on next-generation transport architectures, early FTO analysis against this cluster is a lower-cost alternative to litigation exposure.
Run a freedom-to-operate analysis on US10848546B2 to assess your product’s exposure
Run FTO in Eureka →Similar telecom transport patent cases in Minnesota and federal courts
Explore comparable patent infringement actions involving packet transport networking, dynamic switching, and network management patents litigated in US federal district courts.
What this case signals for the telecom infrastructure IP landscape
A solo inventor asserting four telecom transport patents against a global OEM — and exiting in 103 days — raises pointed questions about enforcement strategy and portfolio risk.
Pre-answer exits by plaintiffs rarely signal patent weakness alone
When a plaintiff voluntarily dismisses before any substantive response is filed, the trigger is more often economics or private resolution than claim fragility. Sandstrom’s early exit is consistent with a confidential licensing arrangement or a demand-letter outcome — common in individual-inventor telecom patent enforcement. The absence of any fee-shifting motion by Ericsson suggests no finding of bad faith.
Four unadjudicated patents covering core transport architecture are a live risk
US10848546B2, US10567474B2, US7333511B2, and US7558260B2 cover byte-timeslot synchronous switching, binary file transfer network management, and dynamic packet transport — all relevant to deployed telecom infrastructure. With no IPR filed and no invalidity ruling, these patents carry full presumption of validity. Vendors in adjacent product categories should not treat this dismissal as a green light.
Sandstrom v Ericsson — key questions answered
Mark Sandstrom filed a patent infringement action against Ericsson Inc. and Telefonaktiebolaget L.M. Ericsson in the District of Minnesota on 19 July 2024, asserting four patents covering packet transport networking and dynamic switching. He voluntarily dismissed the case on 30 October 2024 under Rule 41(a)(1)(A)(i), 103 days after filing, before Ericsson filed any answer.
Sandstrom asserted US10848546B2 (dynamically channelizable packet transport network), US10567474B2 (direct binary file transfer based network management system), US7333511B2, and US7558260B2 (byte-timeslot-synchronous dynamically switched multi-source-node data transport bus systems). The patents span application dates from the early 2000s through to 2019–2020 grants.
The public record does not specify. The dismissal notice invokes Rule 41(a)(1)(A)(i) without stating either designation. Under federal rules, such dismissals are generally treated as without prejudice by default unless a prior dismissal of the same claims exists, but practitioners should verify whether any prior assertion of these patents by Sandstrom triggers the two-dismissal rule under Rule 41(a)(1)(B).
Ericsson received no merits ruling — no claim construction, no invalidity finding, and no non-infringement determination. All four patents remain valid and enforceable. Ericsson cannot invoke this dismissal as estoppel or prior adjudication against future assertion. The practical effect is that Ericsson’s exposure to these patents is unchanged; only the current litigation has ended.
Ericsson was represented by Holland & Knight LLP and Stinson LLP. Named defence attorneys included Jacob Baron, Mark Masutani, and Ruth A. Rivard. Sandstrom appears to have filed and litigated the case without a law firm on the plaintiff side, consistent with a pro se or self-represented plaintiff posture.
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