Huizhou Potian v. Kehoe — Pull-Up Bar Patent Action Voluntarily Dismissed
Chinese fitness equipment maker Huizhou Potian Technology Co. Ltd. (trading as Iron Age) sued individual defendant Michael Kehoe in the Northern District of Texas, asserting US11484746B2 covering a doorway pull-up bar. The case closed in just 67 days after the plaintiffs filed a voluntary dismissal without prejudice before the defendant had answered or moved for summary judgment.
Early exit: pull-up bar IP action dropped before defendant responds
On 6 March 2025, Huizhou Potian Technology Co. Ltd. (dba Iron Age), together with co-plaintiffs Niuba Technology Co. Ltd. (dba Amazefan) and Yongkang Chenghe Fitness Equipment Co. Ltd. (dba Newan), filed a patent infringement action against individual defendant Michael Kehoe in the Northern District of Texas. The suit centred on US11484746B2, a patent covering a doorway pull-up bar, and targeted four specific Amazon ASINs alleged to infringe that patent.
The case closed on 12 May 2025 when plaintiffs filed a voluntary dismissal without prejudice pursuant to Fed. R. Civ. P. 41(a)(1)(A)(i). Because the defendant had not yet filed an answer or a motion for summary judgment at the time of filing, no court order was required to effect the dismissal. The without-prejudice designation means the plaintiffs retain the legal right to re-file substantially the same claims against Kehoe in the future.
The 67-day lifespan suggests the matter was resolved — or abandoned — rapidly, possibly reflecting a private settlement, a licensing arrangement reached off the record, or a strategic recalibration by the plaintiffs. The public record does not disclose any financial terms or formal agreement. Because no merits ruling was issued and the defendant filed no responsive pleading, the enforceability of US11484746B2 in relation to the accused ASINs remains publicly untested.
Filing to Voluntary dismissal in 67 days
67 days — resolved well below the median district court patent case duration of 2+ years
Voluntarily dismissed: what the without-prejudice exit means for both parties
Rule 41(a)(1)(A)(i): plaintiff’s right to exit without court approval
Fed. R. Civ. P. 41(a)(1)(A)(i) permits a plaintiff to dismiss an action without a court order by filing a notice of dismissal before the defendant serves an answer or a motion for summary judgment. Because Kehoe had not yet responded, the plaintiffs exercised this right unilaterally. The dismissal takes effect automatically upon filing — no judicial sign-off is required.
Procedural exit — no merits rulingWithout prejudice: the right to re-file is preserved
A without-prejudice dismissal means the case is ended but not permanently. The plaintiffs may re-file the same patent infringement claims against Kehoe at a later date, subject to applicable statutes of limitation. This contrasts with a with-prejudice dismissal, which would bar re-filing entirely. The public record is explicit that this dismissal is without prejudice — re-litigation remains a live option for the plaintiffs.
Re-filing right preservedKehoe avoids a merits ruling — but faces ongoing uncertainty
Michael Kehoe secured the dismissal of this action without having to defend on the merits or incur the cost of full litigation. No finding of infringement or non-infringement was made. However, without prejudice means the threat of re-litigation under US11484746B2 is not extinguished. If the dismissed ASINs remain on sale, the patent holder retains the ability to bring a fresh action.
No merits finding — exposure persistsAmazon ASIN-level targeting signals ongoing enforcement posture
The complaint’s specific identification of four Amazon ASINs is consistent with a broader IP enforcement strategy targeting marketplace sellers of fitness equipment. The voluntary dismissal may reflect a private resolution, but the pattern — filing, early engagement, and quiet exit — is commonly used by IP holders to encourage licensing without full litigation. Other sellers of comparable doorway pull-up bar products should treat US11484746B2 as an active enforcement risk.
Marketplace enforcement risk remainsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Huizhou Potian Technology Co Ltd | Company | Chinese fitness equipment OEM group — holder of US11484746B2 (doorway pull-up bar)Search in Eureka ↗ |
| Defendant | Michael Kehoe | Individual | Individual Amazon seller allegedly offering infringing doorway pull-up bar productsSearch in Eureka ↗ |
| Plaintiff counsel | Hao Ni | Attorney | Counsel for Huizhou Potian Technology Co LtdSearch in Eureka ↗ |
| Plaintiff counsel | Nicholas E. Najera | Attorney | Counsel for Huizhou Potian Technology Co LtdSearch in Eureka ↗ |
| Plaintiff law firm | Ni, Wang & Massand PLLC | Law Firm | Representing Huizhou Potian Technology Co LtdSearch in Eureka ↗ |
| Presiding judge | Judge Ada Brown | Judge | Texas Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice expressly invokes Rule 41(a)(1)(A)(i) and confirms that no answer or summary judgment motion had been filed by Kehoe, establishing the plaintiffs’ unilateral right to dismiss. The without-prejudice designation is explicit, preserving the plaintiffs’ litigation option. The phrasing contains no release, no admission, and no merits concession by either party — the enforceability of US11484746B2 against the accused products is entirely unresolved as a matter of public record.
US11484746B2 — Doorway pull-up bar structural mounting system
US11484746B2 (application number US16/945864) covers a doorway pull-up bar, a category of home fitness equipment designed to mount within a standard door frame without permanent installation. Patents in this space typically protect the mechanical interface between the bar and the door frame — including the lever, pressure, or bracket mechanisms that distribute load and prevent slippage. The specific claims define the boundaries of what competing products must avoid to maintain clearance.
For a Chinese OEM group operating multiple consumer brands on Amazon, asserting a utility patent covering a widely sold fitness product carries significant commercial weight. Doorway pull-up bars are a high-volume, low-differentiation category where patent exclusivity — if enforceable — can translate directly into marketplace advantage. The fact that three separate trading entities filed jointly suggests coordinated IP strategy across a shared product line, and the targeting of specific ASINs indicates active competitive monitoring of the Amazon marketplace.
Should you run an FTO analysis against US11484746B2?
Any business importing, distributing, or selling doorway pull-up bars on Amazon or other e-commerce platforms in the United States should treat US11484746B2 as a live enforcement risk. The patent holder group has demonstrated willingness to file in federal court and target specific product listings by ASIN. R&D and product teams developing door-frame-mounted fitness equipment should verify that their mounting mechanism does not fall within the scope of the asserted independent claims before launch or continued sale.
PatSnap Eureka’s FTO Search Agent can map the claim landscape of US11484746B2, identify relevant prior art, and flag design-around opportunities for doorway pull-up bar products. The tool surfaces cited references, claim charts, and related filings to give IP counsel and product teams a structured basis for clearance decisions — without starting from a blank page. Run a targeted FTO before the next demand letter arrives.
Run a freedom-to-operate analysis on US11484746B2 to assess your product’s exposure
Run FTO in Eureka →Similar fitness equipment patent cases in Texas federal courts
Cases involving utility patent assertions against Amazon marketplace sellers of fitness equipment in the Northern District of Texas and comparable federal venues.
What this case signals for the fitness equipment IP landscape
A fast exit does not mean inactive enforcement — this filing pattern warrants attention from Amazon sellers and fitness equipment importers.
Early dismissals often mask private resolutions in marketplace IP suits
When a patent case closes in under 90 days with a without-prejudice dismissal and no public settlement terms, a private licensing agreement or cease-and-desist compliance is the most common explanation. Sellers targeted by similar plaintiffs should anticipate that resolution may be sought outside the court record.
ASIN-level claims signal systematic marketplace monitoring by the plaintiff group
Naming four specific Amazon ASINs in the complaint suggests the plaintiffs — Iron Age, Amazefan, and Newan — are conducting structured marketplace surveillance. Other sellers of doorway pull-up bars with overlapping product designs should assess their exposure to US11484746B2 before receiving a demand letter.
Huizhou v Michael — key questions answered
Huizhou Potian Technology Co. Ltd. and two co-plaintiffs filed a patent infringement suit against Michael Kehoe in the Northern District of Texas on 6 March 2025, asserting US11484746B2 over doorway pull-up bar products sold on Amazon. The plaintiffs voluntarily dismissed the case without prejudice on 12 May 2025, 67 days after filing, before the defendant had answered.
A without-prejudice dismissal under Rule 41(a)(1)(A)(i) closes the case without adjudicating the merits. No finding of infringement or validity was made. The plaintiffs retain the right to re-file the same claims against Michael Kehoe in the future, subject to applicable limitation periods. It does not constitute a concession by either party.
The asserted patent is US11484746B2 (application US16/945864), covering a doorway pull-up bar. The accused products were identified by four Amazon ASINs: B0C5XSRXCL, B0D21T7HMH, B0D1FRBR4Q, and B09HS76CBD, all categorised as doorway pull-up bars sold by defendant Michael Kehoe.
Three Chinese fitness equipment OEMs filed jointly: Huizhou Potian Technology Co. Ltd. (trading as Iron Age), Niuba Technology Co. Ltd. (trading as Amazefan), and Yongkang Chenghe Fitness Equipment Co. Ltd. (trading as Newan). All are branded Amazon sellers of fitness equipment. They were represented by Ni, Wang & Massand PLLC.
Yes. Because the dismissal was explicitly without prejudice, the plaintiffs are not legally barred from filing a new infringement action against Kehoe asserting US11484746B2 over the same or similar products. However, any re-filed case would need to satisfy standing requirements for each co-plaintiff and fall within the applicable statute of limitations for patent infringement, which is generally six years under 35 U.S.C. § 286.
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