Trelleborg Sealing Profiles Germany GmbH v. Lateral Repairs UAB

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Trelleborg Sealing Profiles Germany GmbH (Germany)
  • Defendant: Lateral Repairs UAB (Lithuania)
  • Plaintiff’s Counsel: Archer & Greiner, P.C.; Dickinson Wright PLCC
• Case Identification: 2:26-cv-01497, D.N.J., 02/16/2026
• Venue Allegations: Plaintiff alleges venue is proper in the District of New Jersey because Defendant has committed acts of infringement in the district, including through third parties located in Closter, New Jersey, and has purposefully directed its activities to the state.
• Core Dispute: Plaintiff alleges that Defendant’s MEGA LINER product, used for pipeline rehabilitation, infringes a patent related to cured-in-place-pipe (CIPP) liners with improved dimensional stability.
• Technical Context: The technology relates to CIPP liners, which are flexible, resin-impregnated tubes used to repair aging or damaged pipelines from within, avoiding the need for costly and disruptive excavation.
• Key Procedural History: The complaint alleges that Defendant’s president is a former employee of a Trelleborg affiliate and that a named inventor on the patent-in-suit provided guidance to the Defendant regarding the manufacture of CIPP products. Plaintiff also alleges it sent a letter to Defendant in July 2025 asserting infringement.

Case Timeline

Date	Event
2013-12-20	’504 Patent Priority Date
2018-04-17	U.S. Patent No. 9,945,504 Issued
2025-07-01	(approx.) Plaintiff's counsel allegedly wrote to Defendant asserting infringement
2026-02-16	Complaint Filed

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

U.S. Patent No. 9,945,504 - “Lining Element for the Rehabilitation of a Pipeline”

• Patent Identification: U.S. Patent No. 9,945,504 (“the ’504 Patent”), titled “Lining Element for the Rehabilitation of a Pipeline,” issued on April 17, 2018.

The Invention Explained

• Problem Addressed: The patent addresses the problem of CIPP liners stretching undesirably in their longitudinal direction during installation (a process called inversing, pressing, or curing) (’504 Patent, col. 2:51-54). This longitudinal expansion can cause the liner to have insufficient thickness and structural integrity, particularly in curved sections or bends of the pipeline (’504 Patent, col. 2:57-59).
• The Patented Solution: The invention is a lining element with a composite structure. It consists of a primary "carrier layer" made of an expandable, resin-absorbent material, into which a "stiffening structure" is incorporated (’504 Patent, abstract). This stiffening structure is engineered to have a higher "expansion rigidity" along the pipe's length than the carrier layer itself (’504 Patent, col. 2:15-18). This design limits longitudinal stretching while still allowing the liner to expand radially to press firmly against the inner wall of the host pipe (’504 Patent, col. 2:29-34).
• Technical Importance: This approach provides the CIPP liner with improved dimensional stability during the critical installation phase, helping to ensure a uniform and reliable repair throughout the pipeline, including in areas with changes in diameter or direction (’504 Patent, col. 2:59-62).

Key Claims at a Glance

• The complaint asserts independent claims 1 (a lining element) and 14 (a method of manufacturing) (Compl. ¶¶24, 33).
• The essential elements of independent claim 1 include:
  • A carrier layer of an expandable, resin-absorbent material having a first expansion rigidity in the longitudinal direction.
  • A stiffening structure incorporated into the carrier layer, having a second expansion rigidity in the longitudinal direction that is greater than the first expansion rigidity.
  • The stiffening structure is configured such that the expansion rigidity is unchanged in the direction transverse to the longitudinal direction.
  • The stiffening structure is formed of at least one stiffening element, using one or more threads extending in the longitudinal direction.
  • At least one of the threads has a fineness between approximately 50 dtex and approximately 2500 dtex.
• The complaint reserves the right to assert various dependent claims (Compl. ¶24).

III. The Accused Instrumentality

Product Identification

The accused product is the MEGA LINER (Compl. ¶2).

Functionality and Market Context

• The MEGA LINER is a CIPP product sold for the rehabilitation of underground pipelines (Compl. ¶26).
• The complaint alleges, based on testing, that the product is composed of a polyester needle fleece carrier layer which is expandable and resin-absorbent (Compl. ¶27).
• It is alleged to contain an incorporated "stiffening structure" formed of one or more threads that extend longitudinally (Compl. ¶¶29, 31). The complaint includes photographs, derived from its inspection of the MEGA LINER product, showing threads identified as a "Stiffening Element" embedded within the fibrous "Carrier Layer" (Compl. p. 7).
• The complaint positions Defendant as a competitor to Plaintiff in the CIPP products market in the United States (Compl. ¶17).

IV. Analysis of Infringement Allegations

Claim Chart Summary

The complaint provides a narrative infringement theory for claim 1 of the ’504 Patent. The core allegations are summarized below.

’504 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
A lining element...having a carrier layer of an expandable, resin-absorbent material which, in the longitudinal direction of the carrier layer, has a first expansion rigidity...	The MEGA LINER is a CIPP product for pipeline rehabilitation with a carrier layer made of polyester needle fleece that is expandable and resin-absorbent.	¶¶26-27	col. 2:12-15
...and a stiffening structure which, in the longitudinal direction of the carrier layer, has a second expansion rigidity, wherein the first expansion rigidity is lower than the second expansion rigidity...	The MEGA LINER allegedly has a stiffening structure that provides a second expansion rigidity greater than the first expansion rigidity of the carrier layer.	¶25	col. 2:15-18
...wherein the stiffening structure is incorporated into the carrier layer....	The MEGA LINER allegedly has a stiffening structure incorporated into the liner.	¶29	col. 2:18-19
...wherein the stiffening structure is configured in such a manner that the expansion rigidity is unchanged in the direction transverse to the longitudinal direction....	The MEGA LINER is alleged to be configured such that its expansion rigidity is unchanged in the transverse direction.	¶¶28-29	col. 2:50-54
...the stiffening structure is formed of at least one stiffening element, and the stiffening element is formed using one or more threads extending in the longitudinal direction of the carrier layer...	The stiffening structure of the MEGA LINER is allegedly formed of at least one stiffening element using one or more threads extending longitudinally.	¶¶30-31	col. 6:54-57
...wherein at least one of the one or more threads has a fineness of between approximately 50 dtex and approximately 2500 dtex.	Testing undertaken by Plaintiff allegedly determined that at least one thread in the MEGA LINER has a fineness of 1149.5 dtex, which is within the claimed range.	¶¶30, 32	col. 8:5-8

Identified Points of Contention

• Evidentiary Questions: The complaint’s infringement allegations rely on Plaintiff’s own "review, inspection, and testing" (Compl. ¶24). A central issue will be whether Plaintiff can produce sufficient, credible evidence to prove that the accused product’s components satisfy the claimed functional and quantitative limitations, such as the relative "expansion rigidity" of the layers and the "fineness" of the threads.
• Scope Questions: The analysis may turn on the definition of relative properties. A key question is how "expansion rigidity" is measured and compared. The defendant may argue that under a proper technical definition, its product does not meet the claim limitation that the carrier layer's rigidity is "lower than" the stiffening structure's rigidity.

V. Key Claim Terms for Construction

The Term: "expansion rigidity"

• Context and Importance: This term is central to the patent's novelty and the core of the infringement allegation. The claim requires a specific relationship: the "first expansion rigidity" of the carrier layer must be "lower than" the "second expansion rigidity" of the stiffening structure (’504 Patent, cl. 1). The construction of this term will dictate the methodology for proving infringement.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The patent does not provide a specific mathematical formula or test protocol for measuring "expansion rigidity." This may suggest that the term should be given its plain and ordinary meaning as understood by a person of ordinary skill in the art of material science and textile engineering (’504 Patent, col. 2:20-25).
  • Evidence for a Narrower Interpretation: The patent consistently uses the term in the context of limiting or preventing expansion "during inversing, pressing and/or curing" (’504 Patent, col. 2:20-25; ’504 Patent, col. 7:30-32). A party might argue this context limits the term's meaning to rigidity under the specific physical conditions of CIPP installation, not just a general material property measured in a laboratory setting.

The Term: "incorporated into the carrier layer"

• Context and Importance: This term defines the physical relationship between the stiffening structure and the carrier layer. Whether the accused product's structure is truly "incorporated into" the layer, as opposed to merely being attached or laminated onto it, may be a point of dispute.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification describes the stiffening structure being "connected to the carrier layer in a force-fitting manner" (’504 Patent, col. 2:46-47), which could support a range of integration methods beyond being fully embedded.
  • Evidence for a Narrower Interpretation: The specification repeatedly and preferably describes the incorporation method as "needle-punching" the threads into the carrier layer (’504 Patent, col. 2:40-41; ’504 Patent, cl. 20). This specific embodiment could be used to argue for a narrower construction that requires a similar level of physical integration where the structures are intermingled.

VI. Other Allegations

Indirect Infringement

The complaint does not contain a separate count for indirect infringement or allege specific facts supporting inducement or contributory infringement.

Willful Infringement

The complaint alleges that Defendant’s infringement has been willful (Compl. ¶44). This allegation is based on alleged pre-suit knowledge of the ’504 Patent, stemming from Defendant’s president being a former employee of a Trelleborg affiliate, alleged guidance provided to Defendant by a named inventor of the patent, and a notice letter allegedly sent by Plaintiff’s counsel in July 2025 (Compl. ¶¶18, 19, 21, 36, 43).

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

• A central issue will be one of evidentiary proof: Can Plaintiff’s testing and expert analysis demonstrate that the accused MEGA LINER product meets the specific, relational, and quantitative limitations of the asserted claims, particularly the "expansion rigidity" relationship between its carrier layer and stiffening threads?
• The case will also involve a key question of claim construction: How will the court define "expansion rigidity"? The absence of a precise definition in the patent for this critical functional term creates a significant legal question that may shape the entire infringement analysis.
• Finally, if infringement is found, a primary focus will be on willfulness: Do the allegations concerning the Defendant's hiring of a former Trelleborg employee and its alleged consultation with one of the patent's named inventors establish the "egregious" conduct necessary to support a finding of willful infringement and potential enhanced damages?