NOCO Co. v. Shenzhen Carku Technology: 3-Patent Jump Starter Suit Dismissed With Prejudice
NOCO Company asserted three US patents covering portable vehicle battery jump starters against Chinese manufacturer Shenzhen Carku Technology in the Northern District of Illinois. After 723 days of litigation, NOCO voluntarily dismissed all claims with prejudice under Rule 41(a)(1)(A)(i), permanently extinguishing the asserted claims.
NOCO’s three-patent assault on Carku ends permanently after two years
In February 2023, NOCO Company filed suit against Shenzhen Carku Technology Co., Ltd. in the Northern District of Illinois before Judge Jeremy C. Daniel, asserting infringement of three US patents — US11254213B2, US11447023B2, and US10981452B2 — all directed to portable vehicle battery jump-starting apparatus incorporating safety protection circuitry and battery cell equalization technology. The accused products included Carku’s portable and handheld vehicle battery jump starters sold into the US market.
After 723 days, NOCO’s counsel at Jones Day filed a voluntary notice of dismissal with prejudice under Federal Rule of Civil Procedure 41(a)(1)(A)(i), extinguishing all claims against Carku permanently. A dismissal with prejudice operates as an adjudication on the merits, meaning NOCO cannot reassert these specific claims against Carku on the same patents. The procedural mechanism — a unilateral plaintiff notice rather than a stipulated order — suggests the dismissal occurred before Carku had filed an answer or motion for summary judgment.
The 723-day duration before voluntary dismissal is notable: it exceeds the timeframe typically associated with early settlement, suggesting substantive litigation activity — potentially claim construction, discovery disputes, or licensing negotiations — preceded the resolution. Whether a financial settlement, cross-licensing arrangement, or technical design-around drove NOCO’s decision to walk away with prejudice is not disclosed in the public record. The absence of any defendant counsel on the docket is an unusual signal that may reflect jurisdictional or service complexities common in cross-border enforcement against Chinese manufacturers.
Filing to Dismissed with Prejudice in 723 days
723 days — longer than the median district court patent case resolution of roughly 600 days
Dismissed with prejudice: what the voluntary exit means for both parties
Rule 41(a)(1)(A)(i): plaintiff’s unilateral exit before answer
Under FRCP 41(a)(1)(A)(i), a plaintiff may voluntarily dismiss without a court order if filed before the opposing party serves an answer or a motion for summary judgment. NOCO elected to make this dismissal with prejudice — a stronger commitment than the rule requires — which converts the procedural exit into a permanent bar on re-litigating the same claims against Carku on these three patents.
Permanent claim barNOCO forfeits the right to re-sue Carku on these patents
A with-prejudice dismissal functions as a merits adjudication against the plaintiff. NOCO cannot refile these specific infringement claims against Carku based on US11254213B2, US11447023B2, or US10981452B2. This is a meaningful concession. However, NOCO retains the patents themselves and may enforce them against other parties, or pursue new claims if Carku releases materially different products post-dismissal.
Patents survive; claims against Carku do notCarku wins permanent immunity on the asserted patents
Shenzhen Carku Technology receives effectively permanent protection against re-litigation of these claims. Absent any confidential undertakings, Carku’s existing jump-starter product lines are shielded from further infringement suits by NOCO on these three patent numbers. No defendant counsel appeared of record, which may indicate Carku negotiated resolution directly or through separate channels outside the formal docket.
Carku shielded from re-litigationCross-border jump starter IP: enforcement complexity exposed
This case illustrates the friction of asserting US patents against Chinese consumer electronics manufacturers. The absence of defendant counsel on the docket, combined with a 723-day timeline ending in plaintiff-side with-prejudice dismissal, is consistent with protracted service or jurisdictional challenges followed by private negotiation. For the portable jump-starter sector, NOCO’s three patents remain active and enforceable — competitors outside this settlement remain at risk.
Patents enforceable against othersFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Noco, Co. | Company | Portable power product manufacturer — holder of US11254213B2, US11447023B2, and US10981452B2Search in Eureka ↗ |
| Defendant | Shenzhen Carku Technology Co., Ltd. | Company | Shenzhen-based portable vehicle jump starter manufacturer accused of infringing three NOCO patentsSearch in Eureka ↗ |
| Plaintiff counsel | John A. Marlott | Attorney | Counsel for Noco, Co.Search in Eureka ↗ |
| Plaintiff counsel | Meredith M. Wilkes | Attorney | Counsel for Noco, Co.Search in Eureka ↗ |
| Plaintiff law firm | Jones Day | Law Firm | Representing Noco, Co.Search in Eureka ↗ |
| Presiding judge | Judge Jeremy C. Daniel | Judge | Illinois Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) — a unilateral mechanism available only before the defendant has served an answer or summary judgment motion, which suggests Carku never formally appeared in the litigation. NOCO’s election to dismiss with prejudice, rather than without, is a deliberate and consequential choice: it permanently extinguishes the asserted claims against Carku and removes any possibility of refiling. For Carku, this provides durable protection on the specific patents and products at issue. For NOCO, the patents themselves remain intact and may be asserted against third parties.
US11254213B2, US11447023B2 & US10981452B2 — Portable Vehicle Jump Starter Technology
The three asserted patents — US11254213B2, US11447023B2, and US10981452B2 — originate from US patent applications filed in the 2019 period (application numbers US16/461562, US16/450422, and US16/587624 respectively) and cover portable or handheld vehicle battery jump-starting apparatus. The technical claims centre on two distinct but complementary innovations: battery cell equalization circuitry that balances charge across internal cells to improve performance and longevity, and integrated safety protection systems governing jumper cable connections to prevent reverse polarity, short-circuit, and overcurrent events.
These patents are commercially significant because portable lithium-ion jump starters have become a high-volume consumer and professional automotive accessory category, with Chinese OEMs — including Carku — commanding substantial global market share. Whoever controls key patents on safety circuitry and equalization architecture holds meaningful leverage over product certification, retail access (particularly in regulated markets), and OEM supply chain negotiations. NOCO’s decision to build a three-patent portfolio across closely related application filings reflects a deliberate strategy to create overlapping claim coverage that is difficult for competitors to design around without abandoning core product functionality.
Should your jump-starter product be cleared against US11254213B2, US11447023B2 & US10981452B2?
Any company designing, manufacturing, importing, or distributing portable vehicle battery jump starters for the US market — particularly products incorporating lithium-ion battery packs with cell equalization logic or automatic safety protection on the output leads — should treat these three NOCO patents as live FTO concerns. The with-prejudice dismissal of claims against Carku does not narrow the patents’ claim scope or grant any third-party immunity. Independent patent clearance analysis is warranted before product launch or US market entry.
PatSnap Eureka’s FTO Search Agent can map your product architecture against the independent and dependent claims of US11254213B2, US11447023B2, and US10981452B2, identify the full continuation family descending from applications US16/461562, US16/450422, and US16/587624, and surface any prosecution history estoppel or disclaimer arguments that could limit claim scope. Eureka’s landscape tools also identify competing design-around approaches already in the prior art, helping your R&D team structure non-infringing alternatives efficiently.
Run a freedom-to-operate analysis on US11254213B2 to assess your product’s exposure
Run FTO in Eureka →Similar portable power & automotive electronics patent cases in US district courts
Patent disputes involving portable vehicle jump starters and automotive power electronics in US district courts — mapped by technology overlap, claim type, and enforcement outcome.
What this case signals for the portable jump starter IP landscape
NOCO’s three-patent enforcement action against a major Chinese OEM reveals the strategic and procedural pressures shaping cross-border portable power IP disputes.
NOCO’s patents survive — enforcement risk remains for other jump-starter makers
The with-prejudice dismissal eliminates claims only against Carku. US11254213B2, US11447023B2, and US10981452B2 remain granted and enforceable. Any other manufacturer selling portable jump starters with battery cell equalization circuits or comparable safety protection into the US market should treat these patents as live infringement risk and conduct FTO analysis accordingly.
Unilateral plaintiff dismissal after 700+ days is an unusual pattern worth monitoring
Rule 41(a)(1)(A)(i) is typically used for early exits. A 723-day litigation followed by a unilateral with-prejudice notice — with no defendant counsel ever appearing — suggests either a private resolution (financial or licensing) or a strategic reassessment of enforceability. Either scenario is material intelligence for competitors monitoring NOCO’s enforcement posture in the portable power sector.
Noco v Shenzhen — key questions answered
The dismissal with prejudice bars NOCO from reasserting the same claims against Carku specifically, but does not affect the validity or enforceability of US11254213B2 against any other party. NOCO retains full rights to enforce the patent against other manufacturers selling portable jump starters in the US market.
Rule 41(a)(1)(A)(i) permits unilateral plaintiff dismissal without court approval before the defendant serves an answer or summary judgment motion. The fact it was available after 723 days suggests Carku never formally appeared or filed a responsive pleading in the Northern District of Illinois proceeding. The extended timeline before dismissal is consistent with private negotiation or parallel proceedings occurring outside the court docket.
All three patents were filed in close succession in 2019 under application numbers US16/461562, US16/450422, and US16/587624, and share overlapping technical subject matter relating to portable vehicle battery jump starters. The coordinated filing pattern is consistent with a deliberate continuation or divisional family strategy designed to create broad and overlapping claim coverage in the portable power accessories space.
No. A voluntary dismissal with prejudice affects only the specific parties and claims in that action. It provides no legal protection to third-party manufacturers. Any other company selling portable jump starters with battery cell equalization or safety protection circuitry in the US market remains potentially subject to infringement claims under these three NOCO patents and should conduct independent FTO analysis.
The absence of any recorded defendant counsel suggests Shenzhen Carku Technology may not have formally appeared in the Northern District of Illinois proceedings. This pattern is not uncommon in US patent suits against Chinese manufacturers, where service under the Hague Convention can be protracted and defendants sometimes negotiate directly rather than engaging US litigation counsel. It may also indicate that resolution was reached through a separate commercial or licensing channel.
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