Sensor360 v. Siemens — Patent Infringement Action Dismissed Without Prejudice
Sensor360, LLC filed suit against Siemens, Corp. in the Western District of Texas alleging infringement of US8510076B2, a patent covering sensor apparatus and system technology. The case closed just 68 days after filing when Sensor360 voluntarily dismissed without prejudice under FRCP 41(a)(1)(A)(i), before Siemens had answered the complaint.
Short-lived sensor patent suit exits before Siemens responds
On 25 November 2023, Sensor360, LLC filed a patent infringement action against Siemens, Corp. in the U.S. District Court for the Western District of Texas (Case No. 6:23-cv-00808), presided over by Chief Judge David Alan Ezra. The suit asserted US8510076B2 — a patent directed at sensor apparatus and system technology — alleging that Siemens products fell within its claims. Plaintiff was represented by Isaac Rabicoff of Rabicoff Law LLC; no defendant counsel appeared on the public record.
The case concluded on 1 February 2024 — just 68 days after filing — when Sensor360 filed a notice of voluntary dismissal without prejudice under Federal Rule of Civil Procedure 41(a)(1)(A)(i). Because Siemens had not yet filed an answer or a motion for summary judgment at that point, Sensor360 was entitled to dismiss as of right, requiring no court approval. The dismissal without prejudice means the action was terminated without any finding on the merits, and Sensor360 is not barred from refiling the same claims against Siemens in the future.
A resolution in under 70 days, before any substantive litigation activity by the defendant, is consistent with an early settlement negotiation, a licensing discussion, or a plaintiff decision to reconsider strategy — though the public record is silent on which drove the withdrawal. No damages were assessed and no injunction was entered. The compressed timeline and the absence of any defendant filing leaves the underlying dispute — and its commercial resolution, if any — largely opaque.
Filing to voluntary dismissal in 68 days
68 days — resolved before defendant filed any responsive pleading
What a voluntary dismissal without prejudice means for both parties
FRCP 41(a)(1)(A)(i): Dismissal as of right
Under Federal Rule of Civil Procedure 41(a)(1)(A)(i), a plaintiff may dismiss an action without a court order by filing a notice of dismissal before the opposing party has served an answer or a motion for summary judgment. Siemens had done neither, so Sensor360’s dismissal was self-executing — it took effect the moment the notice was filed, with no judicial approval required.
No court order neededWithout prejudice: the case can be refiled
A dismissal ‘without prejudice’ means no decision was made on the merits and no claim preclusion attaches. Sensor360 retains the legal right to assert US8510076B2 against Siemens again in a future action, subject to the applicable statute of limitations. This contrasts sharply with a dismissal ‘with prejudice,’ which would permanently bar the same claims. The public record does not disclose whether any side agreement — such as a license or covenant not to sue — accompanied this dismissal.
Refiling right preservedSiemens filed nothing — costs and leverage implications
Because Siemens never answered or moved, it incurred minimal litigation cost on the public record and made no admissions. This posture is typical where a defendant and plaintiff are in early dialogue. However, Siemens also secured no formal protection — no invalidity finding, no non-infringement ruling, no covenant not to sue from the court. Its exposure to a future suit on US8510076B2 remains legally intact.
No formal protection securedNo fee award — each party bears its own costs
A voluntary dismissal under FRCP 41(a)(1)(A)(i) carries no automatic fee-shifting. Courts may impose conditions (such as cost-bearing) on a second action if the same plaintiff refiles the same claims, but no such condition appears in the public record here. Both parties appear to have exited without a cost order, consistent with the pre-answer stage at which the dismissal occurred.
No cost order enteredFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Sensor360, LLC | Company | Patent assertion entity — holder of US8510076B2 (sensor apparatus and system)Search in Eureka ↗ |
| Defendant | Siemens, Corp. | Company | Siemens, Corp. — U.S. subsidiary of Siemens AG, global industrial technology conglomerateSearch in Eureka ↗ |
| Plaintiff counsel | Isaac Rabicoff | Attorney | Counsel for Sensor360, LLCSearch in Eureka ↗ |
| Presiding judge | Judge David Alan Ezra | Chief Judge | Texas Western District Court — Chief JudgeSearch in Eureka ↗ |
Stipulation of dismissal — official text
The dismissal notice invokes FRCP 41(a)(1)(A)(i) explicitly and confirms that Siemens had not answered or moved for summary judgment — the precise conditions that entitle a plaintiff to dismiss as of right. The ‘without prejudice’ qualifier is legally significant: it preserves Sensor360’s full right to refile. The phrasing is formulaic and reveals nothing about any commercial arrangement between the parties; the underlying dispute resolution, if any, remains entirely off the record.
US8510076B2 — Sensor Apparatus and System
US8510076B2 (application number US10/570742) is a granted U.S. patent directed at sensor apparatus and system technology. The patent covers innovations in how sensors are configured, networked, or deployed as integrated systems — a domain with broad commercial relevance across industrial automation, building management, energy monitoring, and IoT infrastructure. The granted status of the patent means it carries a presumption of validity under 35 U.S.C. § 282, which a defendant would need clear and convincing evidence to overcome.
Sensor and sensing system patents have become increasingly contested as industrial automation and smart infrastructure markets expand. Asserting this patent against Siemens — whose portfolio spans industrial controls, building technologies, and smart infrastructure — suggests the plaintiff identified product lines it believed fell within the patent’s claims. For competitors operating in sensor integration, industrial IoT, or automation control, this patent represents a meaningful watch-list asset. The without-prejudice closure means future enforcement against any defendant, including Siemens, remains a live possibility.
Should your team run an FTO against US8510076B2?
Any company developing, manufacturing, or selling sensor apparatus, sensing systems, or integrated sensor networks — particularly in industrial automation, smart building, energy monitoring, or IoT applications — should assess its exposure to US8510076B2. This patent was active enough to support litigation against a major industrial conglomerate, and its without-prejudice dismissal leaves the enforcement threat fully intact for any third party in the space.
PatSnap Eureka’s FTO Search Agent can map your product’s technical features against the claims of US8510076B2, flag any overlap, and surface related prior art that could support a validity challenge if needed. Setting up a claim monitoring alert on US8510076B2 will also notify your team if Sensor360 files continuation claims or if the patent is cited in new litigation — giving you the earliest possible signal to act.
Run a freedom-to-operate analysis on US8510076B2 to assess your product’s exposure
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What this case signals for the sensor technology IP landscape
A pre-answer withdrawal against a major industrial defendant raises questions about plaintiff strategy, licensing outcomes, and the continued enforcement posture around US8510076B2.
Pre-answer dismissals often signal off-docket resolution
When a plaintiff voluntarily drops a suit before the defendant has even answered, it frequently suggests that the parties reached an early commercial agreement — a license, covenant, or settlement — outside the court record. Teams monitoring Sensor360’s enforcement activity should treat this closure as a possible licensing event, not simply an abandoned claim.
US8510076B2 remains enforceable — exposure has not been extinguished
The without-prejudice dismissal leaves US8510076B2 fully valid and assertable. Companies in the sensor apparatus and industrial sensing space that have not conducted a freedom-to-operate analysis against this patent should do so — particularly those whose products resemble the Siemens portfolio segments implicated in this suit.
Sensor360 v Siemens — key questions answered
Sensor360, LLC filed a patent infringement suit against Siemens, Corp. on 25 November 2023 in the Western District of Texas, asserting US8510076B2 (sensor apparatus and system). The case was voluntarily dismissed without prejudice by Sensor360 on 1 February 2024 under FRCP 41(a)(1)(A)(i), 68 days after filing, before Siemens had answered the complaint.
Dismissed without prejudice means the court made no ruling on the merits of the infringement claims. Sensor360 retains the legal right to refile the same claims against Siemens in the future. No claim preclusion attaches. This contrasts with a dismissal with prejudice, which would permanently bar Sensor360 from asserting the same claims.
US8510076B2 is a granted U.S. patent (application no. US10/570742) covering sensor apparatus and system technology. It relates to how sensors are configured and integrated as systems — relevant to industrial automation, IoT, smart buildings, and energy monitoring. It carries a presumption of validity and remained enforceable after this case closed without prejudice.
The public record does not disclose the reason for the early dismissal. A voluntary withdrawal before the defendant answers is commonly associated with an off-docket resolution such as a licensing agreement, covenant not to sue, or a strategic reassessment by the plaintiff. No settlement terms or side agreements appear in the court record for this case.
Yes. Because the dismissal was entered without prejudice under FRCP 41(a)(1)(A)(i), Sensor360 is legally permitted to refile suit against Siemens asserting US8510076B2, subject to applicable statutes of limitations. If Sensor360 refiles the same claims, a court may impose cost conditions under FRCP 41(d), but no permanent bar to refiling exists.
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