DCT

3:26-cv-05427

i4F Licensing NV v. Hangzhou Hanhent Industries Co Ltd

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 3:26-cv-05427, W.D. Wash., 07/27/2026
  • Venue Allegations: Venue is alleged as proper on the basis that Defendants are foreign corporations subject to personal jurisdiction in the district due to infringement-related activities, including the importation of accused products.
  • Core Dispute: Plaintiff alleges that Defendants' Stone Plastic Composite (SPC) flooring panels infringe seven U.S. patents related to flooring material compositions, manufacturing processes, and mechanical panel-interlocking systems.
  • Technical Context: The lawsuit concerns the technology of composite flooring panels, a widely used product category that combines polymers like PVC with mineral fillers to create durable and water-resistant flooring solutions.
  • Key Procedural History: The complaint references pre-suit correspondence, alleging that Plaintiff sent a demand letter to Defendant Hanflor on January 25, 2026, identifying the asserted patents and alleged infringement. The complaint includes Hanflor's response from January 26, 2026, and a subsequent letter from Plaintiff on February 2, 2026. This history is cited as a basis for Plaintiff's willful infringement allegations.

Case Timeline

Date Event
2009-06-12 U.S. Patent No. 8,978,336 Priority Date
2014-02-26 U.S. Patent No. 10,267,046 Priority Date
2015-01-16 U.S. Patent No. 11,091,918 Priority Date
2015-03-17 U.S. Patent No. 8,978,336 Issues
2016-01-01 Plaintiff alleges use of i4F Mark in commerce since at least this date
2016-06-28 U.S. Patent No. 11,794,396 Priority Date
2018-12-04 U.S. Patent No. 12,110,692 Priority Date
2019-04-23 U.S. Patent No. 10,267,046 Issues
2020-05-25 U.S. Patent No. 12,427,753 Priority Date
2021-08-17 U.S. Patent No. 11,091,918 Issues
2023-10-24 U.S. Patent No. 11,794,396 Issues
2024-10-08 U.S. Patent No. 12,110,692 Issues
2025-09-30 U.S. Patent No. 12,427,753 Issues
2026-01-25 Plaintiff sends demand letter to Defendant Hanflor
2026-01-26 Defendant Hanflor responds to demand letter
2026-02-02 Plaintiff sends subsequent letter to Defendant Hanflor
2026-07-27 First Amended Complaint Filing Date

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 8,978,336 - Floor Panel and Floor Covering Consisting of a Plurality of Such Floor Panels

  • Patent Identification: U.S. Patent No. 8,978,336, "Floor Panel and Floor Covering Consisting of a Plurality of Such Floor Panels," issued March 17, 2015.

The Invention Explained

  • Problem Addressed: The patent's background section describes drawbacks of prior art flooring installation methods, noting that the "tilting movement" required to couple panels can exert great forces and cause damage, and that such methods require a large amount of space, making installation difficult in confined areas like near a wall or radiator '336 Patent, col. 1:33-44
  • The Patented Solution: The invention proposes a glueless mechanical locking system for floor panels featuring "resilient" coupling parts. The specific geometry of the tongue-and-groove profiles, including defined aligning edges and locking elements, is designed to allow panels to be coupled with a "snap" action that requires less force and less tilting than prior systems, thereby simplifying installation and reducing the risk of damage '336 Patent, col. 2:25-42 '336 Patent, col. 3:52-67
  • Technical Importance: This technology sought to provide a robust, glueless locking mechanism for flooring that was easier and faster to install, particularly for non-professionals or in tight spaces, by reducing the force and tilting angle required for assembly '336 Patent, col. 2:40-45

Key Claims at a Glance

  • The complaint asserts at least independent Claim 1 Compl. ¶152
  • Essential Elements of Claim 1:
    • A floor panel with a core and first and second resilient coupling parts on opposite edges.
    • The first coupling part comprises a single upward tongue, an upward flank, and an upward groove between them.
    • The upward tongue has specific geometries, including an "upward aligning edge" and a "first locking element."
    • The second coupling part comprises a single downward tongue, a downward flank, and a downward groove between them.
    • The downward tongue has specific geometries, including a "downward aligning edge."
    • The downward flank is provided with a "second locking element" for co-action with the first.
    • The grooves are adapted to receive the tongues of an adjacent panel.
  • The complaint reserves the right to assert other claims, including claims 2-4, 6-13, 17, 19-25, 27, 30, 35, and 39-43 Compl. ¶153

U.S. Patent No. 10,267,046 - Panel Interconnectable with Similar Panels for Forming a Covering

  • Patent Identification: U.S. Patent No. 10,267,046, "Panel Interconnectable with Similar Panels for Forming a Covering," issued April 23, 2019.

The Invention Explained

  • Problem Addressed: The patent background discusses disadvantages of both glued flooring, which can form gaps over time, and prior mechanical locking systems using metal clips, which are described as expensive and time-consuming to install '046 Patent, col. 1:45-61
  • The Patented Solution: The patent describes a floor panel with two different types of mechanical locking systems on its different pairs of edges. The first pair of edges (e.g., long sides) lock together via an "angling down movement." The second pair of edges (e.g., short sides) are designed to lock via a "scissoring movement" that forces the tongue of one panel into the groove of another as the panel is angled down, creating a "triple lock" (horizontal, vertical, and rotational) without glue '046 Patent, col. 2:35-col. 4:20
  • Technical Importance: This invention aimed to create a highly stable and durable floating floor by combining two distinct glueless locking mechanisms, enabling an "angle-snap" installation method that is both easy for the user and results in a firm connection on all four sides of the panel '046 Patent, col. 3:31-41

Key Claims at a Glance

  • The complaint asserts at least independent Claims 1 and 24 Compl. ¶159
  • Essential Elements of Claim 1:
    • A panel with a core and two pairs of opposite edges.
    • A first pair of edges comprising a first edge with a "sideward tongue" and a second edge with a "recess" (defined by an upper and lower lip), designed to lock via an "introduction movement" and an "angling down movement."
    • A second pair of opposite edges comprising a third edge with a "single upward tongue" and a "first...locking element," and a fourth edge with a "single downward tongue" and a "second locking element."
    • These third and fourth edges are designed to lock via a "scissoring movement" during the angling down of the panel.
    • The claim also recites specific inclinations for parts of the upward and downward tongues.
  • The complaint reserves the right to assert other claims, including claims 3-9, 11, 13-16, 20, 23, 26-32, 34, 36-39, 43, and 46 Compl. ¶161

Multi-Patent Capsule

  • Patent Identification: U.S. Patent No. 11,091,918, "Covering Panel and Process of Producing Covering Panels," issued August 17, 2021.
  • Technology Synopsis: The patent addresses the problem of curling in composite flooring panels. The proposed solution is a panel substrate comprising a synthetic material (like PVC) and a filler material (like calcium carbonate) in a specific weight percentage (15-75 wt.%) to optimize rigidity and reduce curling '918 Patent, col. 2:5-17
  • Asserted Claims: Claims 1 and 8 Compl. ¶41
  • Accused Features: The "SPC Accused Products" are alleged to be manufactured by a process of mixing PVC with 15-75 wt.% calcium carbonate, extruding the mixture, and laminating a top layer, thereby infringing the patent Compl. ¶¶91-93
  • Patent Identification: U.S. Patent No. 11,794,396, "Method of Producing a Glueless Dustless Composite Flooring Material System," issued October 24, 2023.
  • Technology Synopsis: This patent describes a method for producing a multi-layer composite flooring system. The method involves fusing a base layer and a face layer together through a "hot-melt overlaying" process that uses heat and compression, specifically avoiding the use of glues or adhesives and moisture-susceptible materials like compressed cellulose '396 Patent, abstract
  • Asserted Claims: Claims 1-3 and 6-11 Compl. ¶41
  • Accused Features: The "SPC Accused Products" are alleged to be made by a process that includes a glue-free SPC core, a multi-layer face layer, and a UV coating, with the layers fused together by hot-melt overlaying Compl. ¶¶102-109
  • Patent Identification: U.S. Patent No. 12,110,692, "Decorative Panel, and Decorative Floor Covering Consisting of Said Panels," issued October 8, 2024.
  • Technology Synopsis: This patent describes a decorative panel having a core at least partially composed of a polymer and a plurality of different plasticizers. The invention aims to improve properties by using specific combinations of plasticizers and may also include reinforcing layers embedded in the core '692 Patent, abstract '692 Patent, col. 2:1-11
  • Asserted Claims: Claims 1, 3, 8, 14, and 15 Compl. ¶41
  • Accused Features: The "SPC Accused Products" are alleged to be decorative panels with an SPC core comprising PVC, calcium carbonate, and a plurality of plasticizers, including those recited in the claims Compl. ¶¶137-141
  • Patent Identification: U.S. Patent No. 12,427,753, "Glueless Dustless Composite Flooring Material System," issued September 30, 2025.
  • Technology Synopsis: The patent describes a composite flooring material with a base layer (e.g., SPC) and a face layer fused together via "hot-melt overlaying" without adhesives. A key feature is a decorative sublayer with a printed pattern and a "decoratively textured" face layer that is at least partially complementary to the pattern '753 Patent, abstract '753 Patent, col. 26:3-6
  • Asserted Claims: Claims 1-5, 8-10, 14, 18-19, and 21-24 Compl. ¶41
  • Accused Features: The "SPC Accused Products" are alleged to have an SPC base layer and a face layer with decorative and wearing sublayers fused by hot-melt overlaying, with a textured surface complementary to a printed pattern Compl. ¶¶118-122

III. The Accused Instrumentality

Product Identification

  • The complaint identifies two categories of accused products: "SPC Accused Products" and "Locking Accused Products" Compl. ¶¶11-12 Both are identified as stone plastic composite (SPC) floor panels and tiles manufactured by Defendant Hanflor Compl. ¶20 Compl. ¶¶22-23

Functionality and Market Context

  • The accused products are described as flooring panels made from a mixture of polyvinyl chloride (PVC) and a stone filler, such as calcium carbonate Compl. ¶21 The complaint alleges the manufacturing process involves extruding this mixture to form an "SPC core layer" and then laminating a top layer using a "hot-melt overlaying process without glue" Compl. ¶¶29-30
  • The products are alleged to feature a layered construction, including an SPC core, a decorative film layer, a wear layer, and a UV-cured coating Compl. ¶26 An image from Defendant Hanflor's sales literature illustrates this layered structure Compl. ¶26, p. 7, Ex. B
  • A key distinction is made regarding the interlocking mechanisms. The "SPC Accused Products" are alleged to utilize a "Lox locking system" from a competitor, while the "Locking Accused Products" are alleged to incorporate Plaintiff's own "3L TripleLock and Click4U" locking systems Compl. ¶¶11-12
  • The complaint alleges Defendants import and sell these products in the United States through various channels, including retailers, distributors, and online platforms like Alibaba Compl. ¶23 Compl. ¶24

IV. Analysis of Infringement Allegations

'336 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
a first resilient coupling part and second resilient coupling part connected respectively to opposite edges of the core The "3L TripleLock" system includes first and second resilient coupling parts on opposite edges of the core. ¶53 col. 2:56-59
the first coupling part comprises a single upward tongue, an upward flank lying at a distance from the upward tongue and an upward groove formed between the upward tongue and the upward flank The first coupling part of the 3L TripleLock system comprises a single upward tongue, an upward flank at a distance from the tongue, and an upward groove between them. ¶53 col. 2:60-63
at least a part of a side of the upward tongue facing toward the upward flank forms an upward aligning edge At least a part of the side of the upward tongue of the 3L TripleLock system forms an upward aligning edge for coupling purposes. ¶54 col. 2:6-9
at least a part of a side of the upward tongue facing away from the upward flank is provided with a first locking element which is connected substantially rigidly to the upward tongue A side of the upward tongue is provided with a first locking element, connected rigidly to the tongue, for co-action with a second locking element. ¶55 col. 2:1-5
the second coupling part comprises a single downward tongue, at least one downward flank..., and a single downward groove formed between the downward tongue and the downward flank The second coupling part comprises a single downward tongue, a downward flank at a distance from the tongue, and a downward groove between them. ¶55 col. 2:5-9
the downward flank is provided with a second locking element which is connected substantially rigidly to the downward flank and adapted for co-action with a first locking element The downward flank is provided with a second locking element connected rigidly to the flank for co-action with the first locking element. An image in the complaint illustrates the 3L TripleLock system's profile Compl. ¶49, Ex. H ¶57 col. 2:15-19

'046 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
a first pair of opposite edges, comprising: a first edge comprising a sideward tongue...; an opposite, second edge comprising a recess for accommodating at least part of the sideward tongue The accused "3L TripleLock and Click4U" panels have a first pair of edges, one with a sideward tongue and the other with a corresponding recess defined by an upper and lower lip. ¶58 col. 21:51-col. 22:14
the sideward tongue being designed such that locking takes place by an introduction movement into the recess... and an angling down movement The accused panels are designed such that locking occurs by introducing the tongue into the recess and angling the panel down, causing the tongue to engage the upper lip and a shoulder on the lower lip. ¶59 col. 22:15-22
a second pair of opposite edges, comprising: a third edge comprising a single upward tongue... and a substantially rigid first locking element, and, a fourth edge comprising a single downward tongue... and a... second locking element The accused panels include a second pair of edges, with one edge having an upward tongue and rigid first locking element, and the other having a downward tongue and a second locking element. ¶60 col. 23:4-20
the third and fourth edges being designed such that locking takes place during angling down of a panel... wherein the fourth edge of a panel to be coupled makes a scissoring movement toward a third edge of yet another panel The third and fourth edges of the accused panels are designed to lock via a "scissoring movement" during angling down, which forces the tongues into the grooves of adjacent panels by deformation. A schematic in the complaint illustrates this installation process Compl. ¶52 ¶61 col. 23:21-34
  • Identified Points of Contention:
    • Structural Match ('336 & '046 Patents): The infringement allegations for the "Locking Patents" depend on whether the "Locking Accused Products" actually incorporate the specific, detailed geometries of the "3L TripleLock and Click4U" systems as claimed. A central technical question will be whether the physical structure of the accused panels maps onto each limitation of the asserted claims, including the specific shapes and relative positions of the tongues, grooves, and locking elements.
    • Functional Match ('046 Patent): The infringement theory for the '046 Patent relies on the accused locking mechanism performing a "scissoring movement." This raises the evidentiary question of what mechanical action constitutes "scissoring" and whether the accused product's assembly process, which involves deformation of the edges, meets that claimed functional requirement.
    • Process vs. Product (Material Patents): For the material patents (e.g., '918, '396, '753), infringement is alleged based on the process by which the products are made (e.g., "hot-melt overlaying without glue") Compl. ¶106 Since the products are manufactured in China, a key issue will be whether the Plaintiff can present sufficient evidence to prove the accused products were made by the claimed infringing processes, as required for infringement under 35 U.S.C. § 271(g). The complaint relies on marketing materials and video screenshots, such as one showing an "SPC Core Extrusion" process, to support these allegations Compl. ¶29, Ex. E

V. Key Claim Terms for Construction

  • For the '336 Patent:

    • The Term: "resilient" (from "first resilient coupling part and second resilient coupling part")
    • Context and Importance: The concept of resilience is central to the patent's described solution for an easier-to-install locking mechanism. The definition of "resilient" will be critical in determining whether the accused products, which may have varying degrees of material flexibility, fall within the scope of the claims. Practitioners may focus on this term because the degree of elastic deformation required to practice the claim will be a core technical dispute.
    • Intrinsic Evidence for a Broader Interpretation: The specification describes the coupling as a "snap connection" and notes the parts "deform elastically," which could be argued to encompass any material that has enough give to engage, without requiring a specific quantifiable level of resilience ('336 Patent, col. 2:37-38).
    • Evidence for a Narrower Interpretation: The patent describes an "end part connected resiliently to the bridge part" and adapted to "move resiliently" '336 Patent, col. 17:11-14 This could support an argument that "resilient" requires a specific structural design that enables a distinct, measurable elastic movement, rather than just incidental material flexibility.

  • For the '046 Patent:

    • The Term: "scissoring movement"
    • Context and Importance: This term describes the unique locking action of the second pair of edges and is a primary point of novelty. The case may turn on whether the accused product's locking action, which the complaint alleges involves deformation, constitutes a "scissoring movement."
    • Intrinsic Evidence for a Broader Interpretation: Claim 1 provides a functional definition, stating the movement is one "such that the downward tongue... will be forced into the upward groove... and the upward tongue... will be forced into the downward groove" '046 Patent, col. 23:25-31 This could support a reading that covers any angling action that achieves this functional result through deformation.
    • Evidence for a Narrower Interpretation: The term itself, along with figures illustrating the interaction of the third and fourth edges during assembly, may support a narrower construction limited to a specific type of pivotal, intermeshing action that resembles the motion of scissors, as distinct from a simple "snap" or "click" '046 Patent, col. 3:45-51

VI. Other Allegations

  • Indirect Infringement: The complaint alleges induced infringement against Defendant Hanflor for "urging or encouraging" third parties, including co-defendant Form Design, to import and sell the accused products in the U.S. Compl. ¶95 Compl. ¶111 The complaint notes that customer reviews on an e-commerce platform reference the provision of "floor installation instructions," which may be argued to constitute instruction to perform infringing installation steps Compl. ¶25, Ex. C
  • Willful Infringement: The complaint alleges willful infringement against Hanflor based on pre-suit knowledge stemming from a demand letter sent on January 25, 2026, and subsequent communications Compl. ¶¶74-82 Compl. ¶96 For Defendant Form Design, willfulness is alleged to commence upon service of the complaint Compl. ¶97
  • Trademark & Unfair Competition: The complaint also includes counts for trademark infringement, false designation of origin, and false advertising under the Lanham Act Compl. ¶¶165-206 It alleges that Hanflor's website falsely advertises the availability of i4F's "Click Lock" systems, using Plaintiff's "i4F Mark" to do so Compl. ¶69 Compl. ¶197 These allegations are factually intertwined with the willfulness claims for patent infringement.

VII. Analyst's Conclusion: Key Questions for the Case

  • Structural and Functional Equivalence: A core issue for the "Locking Patents" ('336 and '046) will be one of technical proof: does the physical geometry and mechanical action of the accused "Locking Accused Products" meet the specific structural and functional limitations of the claims? This will likely involve a battle of expert testimony on whether the accused panels embody, for example, the claimed "resilience" and perform the claimed "scissoring movement."
  • Proving the Process: For the "Material Patents," which include process limitations (e.g., manufacturing via "hot-melt overlaying"), a central evidentiary question will be whether Plaintiff can demonstrate that the accused products, manufactured abroad, are in fact made by the claimed infringing methods. The case may test the sufficiency of relying on marketing materials, online videos, and product teardowns to prove infringement under 35 U.S.C. § 271(g).
  • Disentangling Patent and Trademark Claims: The complaint heavily leverages allegations that Defendants advertise the use of Plaintiff's "i4F" brand locking systems. A key question for the court will be to separate the patent infringement analysis from the trademark claims. The extent to which Defendants' use of the i4F mark can be used as evidence of intent for willful patent infringement, versus being solely a matter of false advertising, will be a critical legal and factual issue.
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