Valtrus Innovations Ltd v. NTT Global Data Centers Americas Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Valtrus Innovations Ltd. and Key Patent Innovations Ltd. (Ireland)
  • Defendant: NTT Global Data Centers Americas, Inc. (Nevada)
  • Plaintiff's Counsel: Reichman Jorgensen Lehman & Feldberg LLP
• Case Identification: 1:26-cv-03945, N.D. Ill., 04/09/2026
• Venue Allegations: Plaintiff alleges venue is proper because Defendant operates three data center facilities in the district, which constitute a regular and established place of business where acts of infringement have allegedly occurred.
• Core Dispute: Plaintiff alleges that Defendant's methods for cooling its data centers infringe patents related to localized and intelligent environmental control systems.
• Technical Context: The patents relate to technologies for improving the energy efficiency of cooling systems in large-scale data centers, a critical operational cost and engineering challenge in the IT infrastructure industry.
• Key Procedural History: The complaint states that Plaintiff provided pre-suit notice to an NTT entity on March 22, 2024, including claim charts for asserted patents. It also notes a prior lawsuit filed against different NTT-related entities in the Eastern District of Texas, which was dismissed after Defendant was identified as the correct operating entity for the accused U.S. data centers. A related declaratory judgment action is reportedly pending between Plaintiff and Vertiv, a supplier of cooling equipment to Defendant.

Case Timeline

Date	Event
2002-04-17	U.S. Patent No. 6,718,277 Priority Date
2002-08-02	U.S. Patent No. 6,854,287 Priority Date
2003-01-16	U.S. Patent No. 6,868,682 Priority Date
2004-04-06	U.S. Patent No. 6,718,277 Issued
2005-02-15	U.S. Patent No. 6,854,287 Issued
2005-03-22	U.S. Patent No. 6,868,682 Issued
2024-03-22	Plaintiff sends pre-suit notice letter to NTT
2024-05-14	Plaintiff files related lawsuit in E.D. Tex. against other NTT entities
2026-04-09	Complaint Filing Date

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

U.S. Patent No. 6,854,287 - Cooling System

The Invention Explained

• Problem Addressed: The patent describes conventional data center cooling systems as inefficient because they are typically designed for a "worst-case scenario" and operate at or near maximum power, even when the actual heat load from computer systems is much lower or unevenly distributed '287 Patent, col. 2:10-29
• The Patented Solution: The invention proposes a more granular cooling method where a plurality of heat exchanger units (HEUs) are positioned within the data center '287 Patent, Fig. 1 The system senses temperatures at various local points and, in response, controls both the temperature of the cooling fluid and the air delivery to specific areas '287 Patent, abstract A key aspect of this control is the ability to "individually manipulat[e] a mass flow rate of the cooling fluid supplied to each of the plurality of heat exchanger units" to match local cooling demands '287 Patent, col. 14:37-41
• Technical Importance: This approach represents a shift from brute-force, room-level cooling to a more intelligent, distributed, and demand-responsive cooling methodology, intended to reduce energy consumption.

Key Claims at a Glance

• The complaint asserts infringement of at least independent claim 1 Compl. ¶30
• Essential Elements of Claim 1:
  • A method for cooling a room with computer systems.
  • Providing a plurality of heat exchanger units configured to receive and deliver air.
  • Supplying these units with cooling fluid from an air conditioning unit.
  • Cooling the air via heat exchange within the units.
  • Sensing temperatures at one or more locations in the room.
  • In response to the sensed temperatures, controlling either the cooling fluid's temperature or the air delivery from the units.
  • Wherein controlling air delivery comprises "individually manipulating a mass flow rate of the cooling fluid supplied to each of the plurality of heat exchanger units."

U.S. Patent No. 6,868,682 - Agent Based Control Method and System for Energy Management

The Invention Explained

• Problem Addressed: The patent identifies the same problem of inefficiency in conventional data center cooling, noting that they often measure temperature only at the main cooling unit, not at the actual heat-producing equipment racks, and lack the ability to vary output based on distributed needs '682 Patent, col. 2:11-29
• The Patented Solution: The invention discloses a hierarchical control system using distributed software "agents" to manage energy '682 Patent, abstract A "first agent" (e.g., a "Rack Agent") monitors a local subsystem and makes local adjustments (e.g., adjusting a vent tile) '682 Patent, col. 13:18-24 If it cannot maintain the desired temperature, it "request[s]" assistance from a "second agent" higher in the hierarchy (e.g., a "Row Agent"), which can take broader action like redistributing cooling fluid among multiple racks '682 Patent, col. 18:30-35 A third, higher-level agent (e.g., a "CRAC Agent") can control the main cooling unit's overall output if the lower-level agents' actions are insufficient '682 Patent, col. 13:41-43
• Technical Importance: This agent-based architecture provides a scalable and intelligent framework for distributed control, allowing for autonomous local adjustments while enabling coordinated, system-wide responses when necessary.

Key Claims at a Glance

• The complaint asserts infringement of at least independent claim 1 Compl. ¶33
• Essential Elements of Claim 1:
  • A method for controlling temperature in a data center.
  • Receiving sensory data (temperature) from a subsystem.
  • Processing the data by a "first agent" within a "hierarchy of agents" to determine if the temperature is within a predetermined range.
  • Adjusting a cooling fluid "delivery rate" using the first agent to maintain the temperature.
  • "Requesting a second agent" from the hierarchy to process the data if the first agent cannot maintain the temperature, unless the second agent "redistributes the cooling fluid."

U.S. Patent No. 6,718,277 - Atmospheric Control Within a Building

• Technology Synopsis: The patent addresses inefficient, room-level cooling by proposing a method that uses sensors to generate an "empirical atmospheric map" (e.g., a thermal map) of the facility '277 Patent, col. 6:1-4 This real-world map is then compared to a "template atmospheric map" representing an ideal state, allowing the system to identify "pattern differentials" like hot spots and determine targeted corrective actions '277 Patent, col. 6:36-43
• Asserted Claims: The complaint asserts infringement of at least independent claim 1 Compl. ¶36
• Accused Features: The complaint alleges infringement by Defendant's methods of controlling atmospheric conditions within its data centers, potentially using equipment from suppliers such as Stulz, Schneider Electric, Nlyte, or Automated Logic Compl. ¶36

III. The Accused Instrumentality

Product Identification

The accused instrumentalities are Defendant's methods of operating and cooling its data centers, including its CH1, CH2, and CH3 facilities in Itasca, Illinois Compl. ¶14 Compl. ¶17

Functionality and Market Context

The complaint alleges that Defendant's data centers use cooling equipment sourced from various suppliers, including Vertiv Corporation and Stulz Compl. ¶¶18-19 Plaintiff alleges that Defendant uses this equipment to perform methods that infringe the asserted patents Compl. ¶17 The complaint includes a screenshot from a video tour of an NTT data center, which shows server racks and related infrastructure Compl. p. 4 Another provided visual is a press release announcing a partnership between NTT and Stulz to implement Stulz's precision air conditioning systems in Japanese data centers, which Plaintiff alleges on information and belief is also used in U.S. data centers Compl. p. 5 Compl. ¶19

IV. Analysis of Infringement Allegations

The complaint references claim-chart exhibits that were not provided with the analyzed documents. The following analysis is based on the narrative allegations of infringement in the complaint.

'287 Patent Infringement Allegations

The complaint alleges that NTT infringes claim 1 of the '287 Patent by "performing methods of cooling its data centers" Compl. ¶30 The theory suggests that the cooling systems used by NTT, which include equipment from suppliers like Vertiv and Stulz, constitute a "plurality of heat exchanger units" that are supplied with a cooling fluid Compl. ¶30 It is alleged that these systems sense temperatures and control air delivery in response, thereby practicing the steps of the asserted claim Compl. ¶30

'682 Patent Infringement Allegations

The complaint alleges that NTT's methods of cooling infringe claim 1 of the '682 Patent Compl. ¶33 The infringement theory appears to be that the control systems used in NTT's data centers, employing equipment from Vertiv, Stulz, and others, operate with a distributed and hierarchical control logic analogous to the claimed "hierarchy of agents" Compl. ¶33 The narrative suggests these systems perform local adjustments to cooling delivery and escalate control to higher-level systems when local actions are insufficient, thereby mapping onto the claimed method steps Compl. ¶33

Identified Points of Contention

• Architectural Questions: A central question for the '682 Patent will be whether the control architecture of Defendant's multi-vendor cooling systems can be characterized as a "hierarchy of agents" as claimed. The analysis may focus on whether a local controller ("first agent") makes an explicit "request" to a higher-level controller ("second agent") for assistance, or if the system operates on a more conventional centralized or independent basis.
• Technical Questions: For the '287 Patent, the dispute may center on the claim requirement of "individually manipulating a mass flow rate of the cooling fluid" supplied to each heat exchanger unit. The question will be what evidence demonstrates this level of granular, individualized control in response to local sensing, as opposed to broader, zone-based adjustments.

V. Key Claim Terms for Construction

Claim Term: "hierarchy of agents" ('682 Patent, Claim 1)

• Context and Importance: This term is foundational to the '682 Patent's inventive concept of distributed, intelligent control. The outcome of the case may depend on whether Defendant's control system architecture falls within the scope of this term.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The claims describe the agents functionally (e.g., a "first agent" that processes local data, a "second agent" that redistributes fluid), which could support an interpretation covering any multi-tiered control system that performs these functions, regardless of its specific software implementation '682 Patent, col. 18:23-35
  • Evidence for a Narrower Interpretation: The specification provides a detailed embodiment with a specific three-level structure: "Rack Agents," "Row Agents," and "CRAC Agents" '682 Patent, Fig. 4 '682 Patent, col. 13:18-50 This detailed description may be used to argue that the term is limited to a system with this explicit software-agent structure.

Claim Term: "individually manipulating" ('287 Patent, Claim 1)

• Context and Importance: This term defines the required granularity of control. Its construction will determine whether systems that control cooling on a zonal or regional basis infringe, or if control must be specific to each individual heat exchanger unit.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The patent's goal is to move away from inefficient "worst-case" cooling, which could support reading the term to cover any system that provides more localized control than a single, room-level system '287 Patent, col. 2:10-14
  • Evidence for a Narrower Interpretation: The claim language recites manipulating the flow rate "supplied to each of the plurality of heat exchanger units," which suggests a one-to-one control relationship is required '287 Patent, col. 14:39-41 The use of valves to control flow to respective fluid lines further supports this more granular interpretation '287 Patent, col. 7:42-46

VI. Other Allegations

Willful Infringement

The complaint does not contain an explicit count for willful infringement. However, it alleges facts that may support such a claim, stating that on March 22, 2024, Plaintiff sent a letter to Defendant's General Counsel identifying its patent portfolio and providing "claim charts demonstrating infringement of seven patents, including the '287 Patent and '277 Patent" Compl. ¶22 This allegation establishes pre-suit knowledge of the patents and Plaintiff's infringement contentions. The prayer for relief requests enhanced damages pursuant to 35 U.S.C. § 284 and attorneys' fees for an exceptional case under § 285, remedies typically associated with findings of willful infringement Compl. Prayers B, D

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

• Architectural Mapping: A primary issue will be one of architectural equivalence: Does the operational logic of Defendant's cooling systems, which integrate equipment from multiple vendors, map onto the specific "hierarchy of agents" recited in the '682 Patent and the "empirical atmospheric map" comparison process of the '277 Patent, or is there a fundamental structural and functional mismatch?
• Granularity of Control: The case will likely turn on a question of technical proof: Can Plaintiff demonstrate that Defendant's methods achieve the specific "individually manipulating" of coolant flow for each cooling unit as required by the '287 Patent, or will the evidence show a more conventional, less granular form of zone-based environmental control?
• Method versus Capability: A key evidentiary question will be one of actual performance: Given that the allegations concern infringement of method claims, the focus will be not just on the capabilities of the hardware (e.g., from Vertiv or Stulz), but on proof that Defendant's day-to-day operation of its data centers actually performs all of the steps recited in the asserted claims.