DCT

4:26-cv-03352

Harting Electric Stiftung & Co KG v. Phoenix Contact GmbH & Co KG

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: Harting Electric Stiftung & Co. KG v. PHOENIX CONTACT GMBH & CO. KG, 4:26-cv-03352, S.D. Tex., 09/22/2026
  • Venue Allegations: Plaintiff alleges venue is proper for Defendant Phoenix Contact GmbH & Co. KG as a foreign entity that may be sued in any judicial district. For Defendant Phoenix Contact USA, Inc., venue is alleged based on its operation of a "regular and established place of business" in the district—a "Customer Technology Center" in Houston—and its commission of infringing acts within the district.
  • Core Dispute: Plaintiff alleges that Defendant’s industrial plug connectors infringe patents related to mechanical features that increase resistance to unintentional disengagement.
  • Technical Context: The technology concerns high-current electrical connectors used in industrial applications such as data centers, where a reliable and secure physical connection is critical for safety and operational continuity.
  • Key Procedural History: The complaint alleges that Plaintiff notified Defendant of the pending patent applications and impending infringement on May 5, 2025, followed by an in-person meeting on May 14, 2025. Plaintiff also notes that it filed suit in Germany against Defendant’s European entities on June 10, 2025, and September 26, 2025, for infringement of related German utility models.

Case Timeline

Date Event
2023-01-23 '985 Patent Priority Date
2023-02-20 '124 Patent Priority Date
2024-01-01 Approximate date Phoenix began releasing Accused Products
2025-05-05 Plaintiff notified Defendant of pending patent applications
2025-05-14 Parties met to discuss the matter
2025-06-10 Plaintiff filed suit in Germany on related utility models
2025-09-02 '124 Patent Issue Date
2025-09-02 Date on or after which an accused product with a retention pin was allegedly present in the U.S.
2025-09-26 Plaintiff filed a second suit in Germany
2025-11-25 '985 Patent Issue Date
2025-12-14 Plaintiff downloaded datasheet for an accused product from Defendant's website
2025-12-15 Date on or after which certain accused products were available for sale on Defendant's U.S. website
2026-09-22 Complaint Filing Date

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

U.S. Patent No. 12,407,124 - “Connector Disengage Resistance Mechanism”

  • Patent Identification: U.S. Patent No. 12,407,124, “Connector Disengage Resistance Mechanism,” issued September 2, 2025.

The Invention Explained

  • Problem Addressed: The patent’s background section identifies a need for plug-and-socket connectors to have a sufficient withdrawal force to prevent unintentional disconnection, even when a primary locking mechanism is disengaged, as required by technical standards such as UL 1682 U.S. Patent No. 12,407,124, col. 1:33-41
  • The Patented Solution: The invention uses a non-conductive “retention pin” placed within a contact cavity of a plug connector insert (’124 Patent, abstract). This pin has a protruding portion with a diameter larger than the corresponding opening in the mating socket, causing the pin to “resiliently deform” upon insertion or removal, thereby creating an additional retention force that resists disengagement (’124 Patent, col. 1:52-58). Figure 3 illustrates the retention pin (160) situated in a central cavity of the contact insert (130) alongside standard pin contacts (150).
  • Technical Importance: This design provides a method for increasing the withdrawal force of a connector, which may allow existing connector designs to be retrofitted to meet higher safety or performance standards without substantial mechanical redesign (’124 Patent, col. 1:58-62).

Key Claims at a Glance

  • The complaint asserts infringement of at least independent claim 1 Compl. ¶47
  • The essential elements of independent claim 1 are:
    • A plug connector assembly comprising a contact insert and a retention pin.
    • The contact insert has a “plurality of cavities arranged in a matrix of three columns and two rows.”
    • The retention pin has a base portion and a protruding portion, and it “occupies a cavity in a middle column of the matrix.”
    • The retention pin is “not electrically conductive.”
    • The protruding portion is “configured to engage a socket insert of the socket connector when the plug connector assembly is plugged into the socket connector.”

U.S. Patent No. 12,482,985 - “High-Current Plug-In Connector System and Method for Setting Its Total Disconnection Force”

  • Patent Identification: U.S. Patent No. 12,482,985, “High-Current Plug-In Connector System and Method for Setting Its Total Disconnection Force,” issued November 25, 2025.

The Invention Explained

  • Problem Addressed: The total force required to disconnect high-current plug-in connectors often results from an unpredictable combination of factors like friction and is not easily adjustable to meet specific functional or safety demands (’985 Patent, col. 1:47-54).
  • The Patented Solution: The patent describes a system using a dedicated, non-conductive "latching pin" in the plug and a corresponding "latching receptacle" in the mating connector, which replace a standard electrical contact pair (’985 Patent, abstract). The pin features a groove with a precisely angled "holding surface", and the receptacle has flexible "fins" with "latching hooks". The interaction of these specific geometries generates a predictable and adjustable disconnection force (’985 Patent, col. 2:30-42).
  • Technical Importance: This innovation allows the total disconnection force of a modular connector system to be deliberately set to a specified value, enabling retrofitting and customization for different applications (’985 Patent, col. 2:4-15).

Key Claims at a Glance

  • The complaint asserts infringement of at least independent claim 1 Compl. ¶58
  • The essential elements of independent claim 1 are:
    • A system with a plug-in connector (containing a "latching pin") and a mating plug-in connector (containing a "latching receptacle").
    • The latching pin is made of “electrically non-conductive material” and has a "holding surface" at an “angle between 85° and 95°” to the plug-in direction.
    • The latching receptacle is also made of “electrically non-conductive material” and has a plurality of "fins" with radially inwardly directed "latching hooks".
    • Each latching hook has a "latching surface" that is adapted to engage the "holding surface" of the latching pin in the connected state.

III. The Accused Instrumentality

Product Identification

  • The complaint identifies the Accused Products as industrial plug connectors from Defendant’s HC-DCC4 and HC-DDC06 Series, including specific contact inserts, housings, and pins Compl. ¶¶32-33

Functionality and Market Context

  • The Accused Products are used for high-voltage power connections in industrial settings, particularly data centers (Compl. ¶¶7; Compl. ¶9; Compl. ¶32). The complaint alleges that these products replicate Plaintiff's patented designs for enhancing connector retention Compl. ¶8
  • Plaintiff alleges that Defendant sought and obtained qualification for these components from a large U.S. data center customer for use in connections between Power Distribution Center (PDC) whips and rack whips Compl. ¶36 It is further alleged that to meet Underwriters Laboratories (UL) standards required for this qualification, the male contact insert must include a retention pin Compl. ¶37 The complaint includes a screenshot from Defendant's website showing a product page with an "ADD TO CART" button, which it presents as evidence of offers for sale in the U.S. Compl. p. 12

IV. Analysis of Infringement Allegations

’124 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
a contact insert comprising a plurality of cavities, the plurality of cavities arranged in a matrix of three columns and two rows The Accused Products allegedly include contact inserts that meet this specific 3x2 matrix configuration. ¶47; ¶48 col. 4:52-53
a retention pin having a base portion and a protruding portion, wherein the retention pin occupies a cavity in a middle column of the matrix The Accused Products are alleged to contain a retention pin that replicates Plaintiff's design and is necessary for UL qualification. ¶8; ¶37; ¶38 col. 4:60-63
wherein the retention pin is not electrically conductive The complaint describes the patented invention as using a "non-conductive retention pin," and the infringement allegation implies the accused pin has this property. ¶45 col. 7:18-20
wherein the protruding portion of the retention pin is configured to engage a socket insert of the socket connector The accused retention pin is alleged to engage a socket contact opening, with the resulting resilient deformation providing increased resistance to disengagement. ¶45 col. 1:52-58
  • Identified Points of Contention:
    • Scope Questions: A primary issue may be whether the accused connectors strictly conform to the structural layout of claim 1. The court will need to determine if evidence shows the accused contact inserts have a "matrix of three columns and two rows" and if the accused retention pin is located in the "middle column" of that matrix, as the complaint's allegations imply but do not detail with specificity.
    • Technical Questions: A factual question for the court will be whether the accused retention pin functions as claimed. What evidence supports the allegation that the pin "resiliently deforms" upon engagement with a socket to create an added retention force, as opposed to achieving a similar result through a different technical mechanism?

’985 Patent Infringement Allegations

The complaint incorporates an exhibit for its claim chart which was not provided. The following table is a summary based on the complaint's narrative infringement theory.

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
a plug-in connector with... a latching pin in one of the plurality of contact chambers, the latching pin having a plug-in region comprising a holding surface, the holding surface being at an angle between 85° and 95° to a plug-in direction... The Accused Products are alleged to include a plug-in connector with a latching pin mechanism whose geometry, including the angle of its holding surface, falls within the claimed range. ¶56; ¶58; ¶59 col. 5:29-37
wherein the latching pin is made of electrically non-conductive material The infringement allegation implies the accused latching pin is non-conductive, consistent with the claim. ¶58; ¶59 col. 5:40-44
a mating plug-in connector with... a latching receptacle... comprising a plurality of fins that point in a plug-in direction... each of the plurality of fins having a radially inwardly directed latching hook The Accused Products are alleged to include a mating connector with a corresponding latching receptacle containing fins and hooks as described in the claim. ¶56; ¶58; ¶59 col. 5:45-52
wherein the latching surface of the latching hook is adapted to engage with the holding surface of the... latching pin in the plug-connected state The accused system is alleged to engage and disengage in a controlled manner, where the surfaces of the accused latching mechanism interact as claimed to establish a mechanical connection. ¶56 col. 5:38-42
  • Identified Points of Contention:
    • Geometric Questions: The infringement analysis will likely focus on the precise geometry of the accused mechanism. A central dispute may be whether the defendant’s product has a "holding surface" that is, in fact, oriented at an "angle between 85° and 95°" to the plug-in direction. This narrow numerical range presents a specific evidentiary hurdle for the plaintiff.
    • Scope Questions: The court may need to resolve whether the components in the accused system are properly characterized as a "latching pin" and "latching receptacle" as those terms are used in the patent, or if they represent a different and non-infringing design.

V. Key Claim Terms for Construction

’124 Patent Term: "retention pin"

  • The Term: "retention pin"
  • Context and Importance: This term defines the core inventive component. The construction of this term will be critical to determining whether the accused component, which Plaintiff alleges is also a "retention pin" Compl. ¶38, falls within the scope of the claims.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The patent summary describes the pin by its function: it "causes a retention force when the plug connector is removed from the socket connector" (’124 Patent, col. 1:56-58). This functional language may support a construction that covers a variety of structures that achieve this result.
    • Evidence for a Narrower Interpretation: Claim 1 itself imposes strict structural limitations, requiring the pin to be "not electrically conductive" and to occupy a "cavity in a middle column" of a "matrix of three columns and two rows" (’124 Patent, claim 1). The specification also details specific embodiments with features like a "bulged portion" and a "slot," which could be used to argue for a narrower definition (’124 Patent, col. 2:2-7).

’985 Patent Term: "holding surface being at an angle between 85° and 95° to a plug-in direction"

  • The Term: "holding surface being at an angle between 85° and 95° to a plug-in direction"
  • Context and Importance: This precise geometric limitation is a cornerstone of claim 1. Practitioners may focus on this term because infringement will likely depend on factual evidence and expert testimony establishing that the accused device's corresponding surface falls within this narrow 10-degree angular range.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: A party arguing for a broader scope might point to specification language describing the holding surface as "substantially perpendicular" and providing a wider exemplary range of "between 80° and 120°" (’985 Patent, col. 5:29-33). This could support an argument that the claimed 85°-95° range is merely a preferred embodiment.
    • Evidence for a Narrower Interpretation: A party arguing for a narrow scope will emphasize the explicit recitation of the "85° and 95°" range directly in the claim language itself. The doctrine of claim differentiation and the specificity of the language provide strong support for construing the term as being strictly limited to the recited numerical bounds.

VI. Other Allegations

  • Indirect Infringement: The complaint alleges Defendants induce infringement by providing "specifications, datasheets, instruction manuals, and/or other materials that encourage and facilitate infringing uses" to customers and distributors Compl. ¶49 Compl. ¶60 It further alleges contributory infringement, asserting the Accused Products are a material part of the invention and have no substantial non-infringing uses Compl. ¶50 Compl. ¶61
  • Willful Infringement: The complaint alleges willful infringement based on Defendants’ continuation of infringing activities despite having knowledge of the asserted patents. This knowledge is alleged to have been established through communications beginning in May 2025, prior to the filing of the lawsuit, or alternatively, through the filing of the complaint itself Compl. ¶51 Compl. ¶62

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

  • A core issue will be one of structural correspondence: does the evidence demonstrate that the accused connectors possess the specific physical arrangement required by the ’124 patent's claims, particularly the "matrix of three columns and two rows" and the placement of the retention pin within the "middle column"?
  • The dispute over the ’985 patent may turn on a question of precise geometry: will Plaintiff be able to prove, through expert analysis and measurement, that the accused connector's latching mechanism includes a "holding surface" oriented at an angle that falls within the narrowly claimed "85° to 95°" range?
  • A key question for damages will be one of intent: given the allegations of pre-suit notice and parallel European litigation, what evidence will demonstrate that Defendant’s alleged infringement was willful, potentially justifying enhanced damages?