Dynamite Marketing v. The Magnet Group: Design Patent Dismissed With Prejudice
Dynamite Marketing, Inc. filed a design patent infringement action against The Magnet Group in the Eastern District of Missouri, asserting USD751877S covering a credit card sized multi-tool. The case closed after 310 days when Dynamite Marketing filed a voluntary dismissal with prejudice — permanently relinquishing its right to re-file the same claim.
Design patent dispute over a credit card multi-tool ends on plaintiff’s own terms
On 28 January 2025, Dynamite Marketing, Inc. filed suit against The Magnet Group in the U.S. District Court for the Eastern District of Missouri (Case No. 4:25-cv-00111), asserting infringement of USD751877S — a design patent covering the ornamental appearance of a credit card sized multi-tool. The case was assigned to Judge Zachary M. Bluestone. Plaintiff was represented by AVEK IP LLC and McGeary Cukor LLC; defendant by Thompson Coburn LLP in St. Louis.
The case closed on 4 December 2025 when Dynamite Marketing filed a Notice of Voluntary Dismissal with Prejudice. The court directed the Clerk to close the case accordingly. A dismissal with prejudice is a final adjudication on the merits as a matter of res judicata — Dynamite Marketing permanently forfeited its right to bring the same infringement claims against The Magnet Group on this patent.
The 310-day duration without reaching substantive motion practice or trial is consistent with a negotiated resolution — whether a settlement, a licensing agreement, or a commercial decision to abandon litigation — though the public record does not disclose which. The with-prejudice designation is notable: it goes further than a standard voluntary dismissal and suggests the parties’ arrangement, if any, was sufficiently complete to warrant a permanent bar on re-litigation.
Filing to Voluntary dismissal in 310 days
310 days to close — consistent with pre-trial voluntary resolution rather than full district court litigation
Dismissed with prejudice: what this closure means for both parties
Voluntary dismissal with prejudice permanently bars re-filing
Under Federal Rule of Civil Procedure 41(a), a plaintiff may voluntarily dismiss an action. When filed with prejudice — as here — the dismissal operates as a final judgment on the merits. Dynamite Marketing cannot file a new lawsuit asserting the same infringement claims under USD751877S against The Magnet Group. This is the most final outcome short of a full trial verdict.
Rule 41(a) — final on meritsPlaintiff chose closure — but surrendered future enforcement rights
By dismissing with prejudice, Dynamite Marketing retained control over the timing of closure but permanently extinguished its claims against this defendant. This typically signals either a negotiated resolution that made further litigation unnecessary, or a strategic assessment that the litigation risk outweighed potential recovery. The public record does not confirm which. USD751877S remains in force and could still be enforced against other parties.
Claims extinguished vs. this defendantThe Magnet Group exits with a permanent shield from this claim
The Magnet Group benefits from res judicata protection: Dynamite Marketing cannot resurrect these specific infringement allegations. Whether The Magnet Group agreed to any commercial terms — a license, a product change, or a payment — is not disclosed in the public record. The outcome is formally defendant-neutral on the merits, but the with-prejudice bar provides durable protection against re-litigation of this dispute.
Res judicata protection securedDesign patent risk remains live for other promotional products players
USD751877S survives this litigation intact — its validity was never adjudicated. Competitors and suppliers in the promotional products space producing credit card format multi-tools should treat this design patent as an active enforcement risk. The with-prejudice dismissal removes The Magnet Group from Dynamite Marketing’s target set but does not limit enforcement against others in the market.
Patent validity uncontestedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Dynamite Marketing, Inc. | Company | Promotional products company — holder of USD751877S (credit card multi-tool design)Search in Eureka ↗ |
| Defendant | The Magnet Group | Company | The Magnet Group — promotional products manufacturer and distributorSearch in Eureka ↗ |
| Plaintiff counsel | David Rein | Attorney | Counsel for Dynamite Marketing, Inc.Search in Eureka ↗ |
| Plaintiff counsel | James J. Kernell | Attorney | Counsel for Dynamite Marketing, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Michael Cukor | Attorney | Counsel for Dynamite Marketing, Inc.Search in Eureka ↗ |
| Plaintiff law firm | AVEK IP LLC | Law Firm | Representing Dynamite Marketing, Inc.Search in Eureka ↗ |
| Plaintiff law firm | MCGEARY CUKOR LLC | Law Firm | Representing Dynamite Marketing, Inc.Search in Eureka ↗ |
| Defendant counsel | Alex Dale Weidner | Attorney | Counsel for The Magnet GroupSearch in Eureka ↗ |
| Defendant counsel | Matthew A. Braunel | Attorney | Counsel for The Magnet GroupSearch in Eureka ↗ |
| Defendant counsel | Nathan Fonda | Attorney | Counsel for The Magnet GroupSearch in Eureka ↗ |
| Defendant law firm | Thompson Coburn LLP (St Louis) | Law Firm | Representing The Magnet GroupSearch in Eureka ↗ |
| Presiding judge | Judge Zachary M. Bluestone | Judge | Missouri Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s directive — issuing solely to close the docket following plaintiff’s Notice of Voluntary Dismissal with Prejudice — contains no merits adjudication. The phrasing confirms the procedural posture: the court made no findings on infringement, claim validity, or damages. For The Magnet Group, the res judicata effect of the with-prejudice dismissal provides the substantive protection; for Dynamite Marketing, USD751877S remains an unimpaired enforcement asset against third parties.
USD751877S — ornamental design for a credit card sized multi-tool
USD751877S (application no. US29/483224) is a U.S. design patent protecting the ornamental appearance of a credit card sized multi-tool — a flat, wallet-format device combining multiple tool functions in a credit card form factor. Design patents under 35 U.S.C. § 171 cover non-functional aesthetic characteristics; scope is determined by comparing the overall visual impression of the claimed design against the accused product as perceived by an ordinary observer.
Credit card format multi-tools occupy a crowded segment of the promotional products market, making ornamental design differentiation commercially significant. A valid design patent in this space can block competitors from producing visually similar items regardless of functional identity. Because USD751877S was never invalidated in this proceeding, it represents an ongoing enforcement risk for any promotional products company, distributor, or OEM supplier producing wallet-format multi-tools with a similar visual appearance.
Should you run an FTO analysis against USD751877S?
Any company designing, manufacturing, sourcing, or distributing credit card sized multi-tools — particularly for promotional, corporate gifting, or retail channels — should assess exposure to USD751877S. This patent emerged from active litigation and its validity was not challenged or limited during these proceedings. An ordinary observer comparison between your product’s ornamental appearance and the claimed design is the operative legal test.
PatSnap Eureka’s FTO Search Agent can map the visual claim scope of USD751877S against your product portfolio, surface prior art that could support a validity challenge, and identify design-around options. For promotional products teams or procurement counsel managing supplier risk, Eureka can also flag related design patent families held by Dynamite Marketing to assess the full enforcement perimeter.
Run a freedom-to-operate analysis on USD0751877S to assess your product’s exposure
Run FTO in Eureka →Similar design patent infringement cases in promotional products
Cases involving ornamental design patents for promotional multi-tools and credit card format products in U.S. district courts, including the Eastern District of Missouri.
What this case signals for the promotional products IP landscape
A with-prejudice exit without a public verdict suggests calculated resolution — and an active design patent still in play.
USD751877S remains enforceable against all other market participants
The dismissal resolves the dispute only between these two parties. Dynamite Marketing’s design patent on the credit card sized multi-tool was never invalidated or limited. Any other company manufacturing or distributing a product with a similar ornamental appearance faces the same infringement risk that brought The Magnet Group to court.
With-prejudice voluntary dismissals often signal undisclosed agreements
The choice to dismiss with prejudice — rather than without — typically indicates that the parties reached a resolution sufficient to warrant a permanent bar. This may include licensing terms, design-arounds, or commercial settlements. IP counsel monitoring the promotional products sector should track both parties’ product lines for changes consistent with a negotiated outcome.
Dynamite v Magnet — key questions answered
Dynamite Marketing filed a Notice of Voluntary Dismissal with Prejudice, which permanently extinguishes its infringement claims against The Magnet Group under USD751877S. The dismissal operates as a final adjudication on the merits under Rule 41(a), meaning the same claims cannot be re-filed. The patent itself remains valid and enforceable against other parties.
The asserted patent is USD751877S (application no. US29/483224), a U.S. design patent covering the ornamental appearance of a credit card sized multi-tool. Design patents protect non-functional visual characteristics, so infringement is assessed by whether an ordinary observer would find the accused product substantially similar in overall visual impression to the claimed design.
No. The case closed on a voluntary dismissal with prejudice before any substantive merits adjudication. The court made no findings on validity, infringement, or claim scope. USD751877S remains in force and Dynamite Marketing retains the right to enforce it against any party other than The Magnet Group on these specific claims.
Not in the conventional trial sense — there was no merits ruling. However, The Magnet Group obtains durable legal protection: Dynamite Marketing is permanently barred from asserting the same infringement claims based on USD751877S against this defendant. Whether any commercial agreement accompanied the dismissal is not disclosed in the public record.
The case was filed in the U.S. District Court for the Eastern District of Missouri and assigned to Judge Zachary M. Bluestone. Dynamite Marketing was represented by AVEK IP LLC and McGeary Cukor LLC (attorneys David Rein, James J. Kernell, and Michael Cukor). The Magnet Group was represented by Thompson Coburn LLP in St. Louis (attorneys Alex Dale Weidner, Matthew A. Braunel, and Nathan Fonda).
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