Power Probe Group v. KMC Electronics: Patent Infringement Dismissed With Prejudice in 33 Days
Power Probe Group Inc. filed suit against KMC Electronics LLC in the Western District of North Carolina, asserting patent US9494634B2 covering its DM300AUTO Digital Multimeter and Fuse Monitor products. The case closed just 33 days after filing — voluntarily dismissed with prejudice before KMC was ever served — a resolution timeline that typically signals a negotiated outcome or strategic recalibration.
A 33-day patent dispute that ended before KMC Electronics was ever served
On June 12, 2025, Power Probe Group Inc. filed a patent infringement action against KMC Electronics LLC in the U.S. District Court for the Western District of North Carolina (Case No. 3:25-cv-00403). The suit centred on US9494634B2, a patent covering technology embodied in Power Probe’s DM300AUTO Digital Multimeter and Fuse Monitor product lines. Power Probe was represented by Shumaker, Loop & Kendrick, LLP, with attorneys Lucas D. Garber, Samuel Alexander Long Jr., and Tom Bengera on record.
On July 15, 2025 — just 33 days after filing — Power Probe filed a notice of voluntary dismissal with prejudice under Fed. R. Civ. P. 41(a)(1)(A)(i), citing the fact that KMC Electronics had not yet been served, had not filed an answer, and had not filed any responsive pleading. Dismissal with prejudice is a permanent bar: Power Probe surrenders the right to bring the same claims against KMC on this patent in the future, distinguishing this from a tactical without-prejudice withdrawal.
The 33-day lifespan — from filing to closure before service was effected — is notably compressed even by the standards of early-stage patent dismissals. The public record does not disclose whether a settlement, licensing agreement, or other commercial resolution precipitated the dismissal. The with-prejudice designation, however, suggests the parties reached a definitive arrangement rather than Power Probe simply abandoning its enforcement effort. What drove that arrangement remains unknown from the available record.
Filing to Voluntary dismissal in 33 days
33 days — well below the median district court patent case duration of 2–3 years
Voluntarily dismissed with prejudice: what the Rule 41 exit means for both parties
Rule 41(a)(1)(A)(i) allows exit before service — but ‘with prejudice’ is binding
Fed. R. Civ. P. 41(a)(1)(A)(i) permits a plaintiff to dismiss as of right, without a court order, before the opposing party has been served or filed an answer. Power Probe invoked this right. However, by electing dismissal with prejudice, the plaintiff converted a procedurally costless exit into a permanent bar against refiling the same claims against KMC on US9494634B2.
Voluntary — with prejudicePower Probe permanently relinquishes its infringement claims against KMC
A with-prejudice dismissal functions as a final adjudication on the merits for res judicata purposes. Power Probe cannot refile infringement claims against KMC based on US9494634B2 arising from the same accused products. This is a meaningful concession — unless a licensing deal or commercial agreement makes the litigation moot, the with-prejudice designation represents a durable constraint on Power Probe’s future enforcement options against this defendant.
Claims permanently barredKMC exits without filing a single pleading — and with permanent protection
KMC Electronics was never served, never appeared, and incurred no recorded legal costs in this proceeding. The with-prejudice dismissal provides KMC with lasting protection against Power Probe reasserting these specific claims. Whether KMC extracted a licence, made a commercial concession, or simply benefited from a unilateral Power Probe decision is not evident from the public record. Either way, KMC’s position is materially stronger post-dismissal.
Full exit, no costs, no liabilityPre-service resolution suggests deal-making, not weakness in the patent
A with-prejudice exit this early typically signals a negotiated resolution — licensing, a supply arrangement, or a market-boundary agreement — rather than a concession that the patent is unenforceable. US9494634B2 remains in force and could be asserted against other parties in the multimeter and fuse monitoring space. Competitors should not interpret this dismissal as evidence of patent vulnerability; the rapid resolution may simply reflect efficient private ordering between these two specific parties.
Patent remains enforceableFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Power Probe Group Inc. | Company | Test and diagnostic equipment manufacturer — holder of US9494634B2Search in Eureka ↗ |
| Defendant | KMC Electronics LLC | Company | KMC Electronics LLC — electronics distributor or manufacturer, Western NC.Search in Eureka ↗ |
| Plaintiff counsel | Lucas D. Garber | Attorney | Counsel for Power Probe Group Inc.Search in Eureka ↗ |
| Plaintiff counsel | Samuel Alexander Long , Jr. | Attorney | Counsel for Power Probe Group Inc.Search in Eureka ↗ |
| Plaintiff counsel | Tom Bengera | Attorney | Counsel for Power Probe Group Inc.Search in Eureka ↗ |
| Plaintiff law firm | Shumaker, Loop & Kendrick, LLP | Law Firm | Representing Power Probe Group Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | North Carolina Western District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) and expressly states KMC was never served and filed no pleading — establishing the procedural right to dismiss without court order. The with-prejudice election is the operative legal event: it converts a unilateral plaintiff action into a permanent bar on refiling. No merits determination was reached. The phrasing offers no explanation for the with-prejudice designation, leaving open whether a settlement, licence, or other arrangement precipitated the exit.
US9494634B2 — Digital Multimeter and Fuse Monitor Technology
US9494634B2 (application number US14/271542) covers technology embodied in Power Probe’s DM300AUTO Digital Multimeter and Fuse Monitor products. The patent sits within the electronic test and measurement domain, specifically addressing digital multimeter functionality combined with automated fuse monitoring — a combination particularly relevant to automotive diagnostics and electrical system testing. The application date context suggests this IP was developed as Power Probe sought to differentiate its product line in the automotive test equipment market.
For the electronic test equipment sector, US9494634B2 represents a commercially deployed patent — meaning it is not purely defensive but actively tied to products in the market. Power Probe’s decision to enforce it against KMC, and to close the matter with a with-prejudice dismissal, is consistent with a patent holder managing a licensing programme rather than engaging in one-off litigation. Any competitor developing digital multimeter products with auto-ranging or fuse-detection capabilities should assess their exposure against this patent’s claim scope before commercialisation.
Should you run an FTO against US9494634B2?
If your organisation develops, manufactures, or distributes digital multimeters, automotive diagnostic tools, or electronic fuse monitoring devices, US9494634B2 is a directly relevant freedom-to-operate consideration. Power Probe has demonstrated a willingness to file suit against competitors in this space. The rapid with-prejudice resolution in this case does not narrow the patent’s reach against other parties — product teams should not assume the dismissal reduces their exposure.
PatSnap Eureka’s FTO Search Agent can map your product’s feature set against the claim language of US9494634B2, identify design-around opportunities, and surface related prior art that may inform validity challenges. For R&D teams building next-generation test equipment, running this analysis pre-launch is materially cheaper than defending a future infringement action in the Western District of North Carolina.
Run a freedom-to-operate analysis on US9494634B2 to assess your product’s exposure
Run FTO in Eureka →Similar Patent Infringement Cases in Electronic Test Equipment
Comparable patent infringement actions involving digital multimeter and automotive test equipment technology filed in U.S. district courts, including the Western District of North Carolina.
What this case signals for the test and diagnostic equipment IP landscape
A pre-service with-prejudice dismissal in 33 days carries distinct strategic signals for patent holders and accused infringers in the electronic test equipment sector.
With-prejudice designations signal deal-making, not abandoned patents
When plaintiffs elect with-prejudice dismissal before service, it almost always reflects a definitive resolution — not surrender. Competitors in the digital multimeter and fuse monitoring space should treat US9494634B2 as a live, enforceable asset. Power Probe’s willingness to file and resolve quickly suggests an active enforcement posture, not a one-off attempt.
Pre-service exits can be the most cost-efficient enforcement tool
Filing and promptly settling before service avoids discovery costs, claim construction, and jury risk for both parties. For patent holders in the test equipment sector, this pattern — file, negotiate, close — can extract licensing value at minimal litigation expense. For defendants, the lesson is that early engagement before service can yield favourable and permanent outcomes.
Power v KMC — key questions answered
The dismissal with prejudice under Rule 41(a)(1)(A)(i) means Power Probe permanently relinquished its infringement claims against KMC based on US9494634B2. Unlike a without-prejudice dismissal, Power Probe cannot refile the same claims against KMC in future. No merits ruling was issued.
The asserted patent is US9494634B2 (application no. US14/271542), covering technology related to Power Probe’s DM300AUTO Digital Multimeter and Fuse Monitor products. The patent sits in the electronic test and measurement domain, with particular application to automotive diagnostics.
The public record does not disclose the reason. The 33-day timeline and with-prejudice designation are consistent with a negotiated resolution — such as a licence or commercial agreement — reached before KMC was served. Power Probe’s counsel at Shumaker, Loop & Kendrick filed the dismissal notice unilaterally, as permitted before service under Rule 41.
No. The dismissal applies only to claims against KMC Electronics. US9494634B2 remains in force and Power Probe retains full rights to assert it against other accused infringers. The dismissal should not be interpreted as a concession regarding the patent’s validity or scope.
The case was filed in the U.S. District Court for the Western District of North Carolina (Case No. 3:25-cv-00403). This court has seen increased patent activity in the electronics sector. The choice of venue may reflect plaintiff counsel’s familiarity with local practice or strategic considerations regarding defendant location.
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