Six Amazon Sellers Seek a Declaratory Judgment Against WXX Commerce on a Magnetic Building Block Patent, Alleging Listing Takedowns.

The parties and the patent

The case is AH Technology Limited, et al. v. WXX Commerce Limited, et al., No. 2:26-cv-04355 (W.D. Wash.), filed November 10, 2026. The six plaintiffs sell magnetic building block toys on Amazon: AH Technology Limited, CheungPrint Limited (doing business as CheungPrint), TYHK Trading Limited (TYToys), Sun Rise Tech Commerce (Cheffun Direct), Yi Suen Commerce (YSC shop), and Hei Hei Product Trading Limited. The complaint describes TYHK Trading and Sun Rise Tech Commerce as Hong Kong companies. The defendants are WXX Commerce Limited and Peixia Chen. The complaint alleges, on information and belief, that Peixia Chen is a Chinese individual and the named inventor of the patent, and that WXX Commerce Limited is a Chinese company owned and operated by Peixia Chen and the registrant of the Toylogy storefront on Amazon.

The patent is U.S. Patent 12,605,643 B2, titled "Magnetic Building Block," which issued April 21, 2026 from an application filed February 2, 2024. The patent lists Peixia Chen of Shenzhen, China as inventor and applicant and identifies the application as a continuation-in-part of an earlier application that is now U.S. Patent 12,151,182. It has eight claims.

What claim 1 covers

U.S. Patent 12,605,643 covers a magnetic building block with magnets that can rotate freely inside internal compartments. Claim 1 covers a block whose main body has outer surrounding walls joined end to end and inner supporting walls that together form compartments, an elongated stop part in each compartment, magnets with north and south poles in the compartments, and upper and lower side walls spaced from the ends of the stop parts. That spacing forms an upper and a lower receiving space, so each magnet sits next to a side wall and can rotate freely. Claim 1 also requires a partition plate connected to the inside of the surrounding walls, four upper and four lower compartments on the plate's upper and lower surfaces, four upper and four lower stop parts, and upper stop parts longer than the lower ones. Claims 2 through 8 depend directly or indirectly from claim 1 and add positioning pillars and holes, a square main body with six side walls, integrally formed walls, plate, and stop parts, four corner compartments, and stop parts that are separate from each other, joined to a common component, or movable.

The Amazon complaints

The complaint alleges that between September 23 and October 8, 2026, the defendants caused at least five infringement complaints under the '643 patent to be submitted to Amazon against the plaintiffs' listings, in waves on September 23, September 30, October 5 and 6, and October 8. It alleges, on information and belief, that WXX Commerce Limited, at Peixia Chen's direction, caused the complaints to be submitted, and that Chen "has represented to Amazon.com that it owns the rights in the '643 Patent." It alleges that the complaints asserted at least claim 1, that Amazon removed listings from all six storefronts for periods of days to weeks, and that some listings of TYHK Trading and Hei Hei Product Trading were still blocked when the suit was filed. It alleges that several products were reported again while their listings were already down and appeals were pending, and that the October 5 and 6 wave came on the eve of Amazon's Prime Big Deal Days event on October 6 and 7, 2026.

The complaint also points to an earlier case, No. 4:25-cv-01168 (E.D. Tex.), in which it says Peixia Chen moved in November 2025 for a temporary restraining order against two of these plaintiffs, among others, on U.S. Patents 11,766,622 and 12,151,182 from the same family. According to the complaint, the court denied that motion on November 25, 2025, finding that Chen had not established a substantial threat of irreparable injury.

Counts and relief

The complaint pleads four counts. Count I seeks a declaratory judgment of non-infringement of claims 1 through 8; the plaintiffs say their products lack the claimed partition plate, the four upper and four lower compartments and stop parts, and the longer upper stop parts. Count II seeks a declaratory judgment of invalidity under 35 U.S.C. 102 and 103, alleging on information and belief that magnetic building blocks with the same features were described in earlier patents or publications or were on sale before the patent's priority date. Count III alleges bad faith assertions of patent infringement under chapter 19.350 RCW and a violation of the Washington Consumer Protection Act, chapter 19.86 RCW. Count IV alleges tortious interference with prospective economic advantage.

The plaintiffs ask for declarations that the patent is invalid, void, and unenforceable and that their products do not infringe, judgments on the tortious interference and Washington statutory claims, an order requiring the defendants to withdraw their Amazon complaints, a permanent injunction against attempts to enforce the '643 patent or to have products removed as infringing it, damages, treble damages and fees under RCW 19.86.090, and a finding that the case is exceptional with fees under 35 U.S.C. 285.

What to watch next

Watch for service on the defendants, any motion for preliminary relief over the Amazon listings, and the defendants' answer or other response. The case can end at any time, including by settlement or voluntary dismissal.