5:26-cv-02311
Range Energy Inc v. Hyliion Inc
I. Executive Summary and Procedural Information
- Parties & Counsel:
- Plaintiff: Range Energy Inc. (Delaware)
- Defendant: Hyliion Inc. (Delaware)
- Plaintiff's Counsel: Global IP Law Group, LLC
- Case Identification: 5:26-cv-2311, N.D. Cal., 03/17/2026
- Venue Allegations: Plaintiff alleges venue is proper in the Northern District of California because Defendant directed extensive patent enforcement and licensing communications to Plaintiff's headquarters in the district, is registered to do business in California, and has availed itself of the California market through its website and attendance at trade shows.
- Core Dispute: Plaintiff seeks a declaratory judgment that its "eTrailer System" does not infringe eight of Defendant's patents related to hybrid electric trailer technology and that the asserted patent claims are invalid.
- Technical Context: The technology concerns hybrid electric systems for commercial truck trailers, which add electric-powered axles to improve fuel efficiency and capture energy through regenerative braking, addressing a significant cost and environmental factor in the trucking industry.
- Key Procedural History: The complaint describes extensive pre-suit licensing negotiations initiated by Hyliion on August 15, 2025, with an assertion letter accusing Range Energy's product of infringing two patents. On March 10, 2026, Hyliion expanded its allegations to include six additional patents. The complaint also notes a dispute regarding the correct inventorship of U.S. Patent No. 10,821,853, which was raised during the parties' discussions.
Case Timeline
| Date | Event |
|---|---|
| 2015-05-01 | Earliest Priority Date ('712, '508, '972, '560, '369, '742, '029 Patents) |
| 2016-09-30 | Priority Date ('853 Patent) |
| 2017-07-04 | U.S. Patent No. 9,694,712 Issues |
| 2017-10-31 | U.S. Patent No. 9,802,508 Issues |
| 2019-04-02 | U.S. Patent No. 10,245,972 Issues |
| 2019-08-20 | U.S. Patent No. 10,384,560 Issues |
| 2020-05-19 | U.S. Patent No. 10,654,369 Issues |
| 2020-11-03 | U.S. Patent No. 10,821,853 Issues |
| 2021-04-06 | U.S. Patent No. 10,967,742 Issues |
| 2024-07-02 | U.S. Patent No. 12,024,029 Issues |
| 2025-08-15 | Hyliion sends initial letter asserting infringement by the '853 and '029 patents |
| 2026-03-10 | Hyliion expands infringement allegations to six additional patents |
| 2026-03-17 | Complaint for Declaratory Judgment filed |
II. Technology and Patent(s)-in-Suit Analysis
U.S. Patent No. 9,694,712 - "Motor Vehicle Accessory to Increase Power Supply and Reduce Fuel Requirements"
The Invention Explained
- Problem Addressed: The U.S. trucking industry faces significant fuel costs, and existing hybrid technologies typically focus on the tractor, leaving the attached trailer as a passive, unpowered load, which limits potential fuel efficiency improvements '508 Patent, col. 1:28-48
- The Patented Solution: The invention is a "hybridizing suspension assembly" designed to replace a standard passive trailer axle assembly. This system incorporates an electric motor-generator coupled to a drive axle, allowing the trailer to provide assistive motive force during acceleration or on inclines ("power assist mode") and to capture kinetic energy through regenerative braking ("regeneration mode") '712 Patent, col. 8:14-29
- Technical Importance: This retrofittable, "through-the-road" hybrid approach enables the hybridization of the vast existing fleet of commercial trailers, not just new tractors, offering a more scalable path to fuel savings in the trucking industry '508 Patent, col. 1:54-62
Key Claims at a Glance
- The complaint identifies independent claim 8 as asserted by Hyliion Compl. ¶41
- Essential elements of claim 8 (a method claim):
- replacing an existing suspension assembly of a trailer with a hybridizing suspension assembly,
- wherein the hybridizing suspension assembly includes a frame, suspension, one or more drive axles, and at least one electric motor-generator coupled to at least one of the drive axles,
- to provide, in a first mode of operation, an assistive motive force and, in a second mode of operation, a regenerative braking force,
- the hybridizing suspension assembly configured with wheels and tires to allow the trailer to roll along a roadway when motivated by the tractor's fuel-consuming engine.
U.S. Patent No. 9,802,508 - "Motor Vehicle Accessory to Increase Power Supply and Reduce Fuel Requirements"
The Invention Explained
- Problem Addressed: The patent addresses the high fuel consumption in the trucking industry, noting that conventional hybridization efforts are generally limited to the tractor unit, leaving the trailer as a passive load '508 Patent, col. 1:28-48
- The Patented Solution: The patent describes a self-contained "hybridizing suspension assembly" for a trailer that includes an electric motor-generator, a battery array, and a controller. The system provides motive force and regenerative braking. Uniquely, it is also configured to capture "regenerated suspension energy" from the movement of the shocks, storing all captured energy in the battery array '508 Patent, abstract '508 Patent, col. 12:24-27 A controller transitions the system between different operational modes based on sensor inputs '508 Patent, col. 8:35-41
- Technical Importance: The invention proposes an intelligent, retrofittable system that enhances trailer efficiency not only through electric drive assistance and braking but also by harvesting energy from suspension movement, a source of energy that is typically lost.
Key Claims at a Glance
- The complaint identifies independent claims 1 and 10 as asserted by Hyliion Compl. ¶48
- Essential elements of claim 1 (an apparatus claim):
- a suspension assembly including a frame, suspension, and one or more drive axles;
- an electric motor-generator coupled to a drive axle to provide motive force (first mode) and regenerative braking (second mode);
- a battery array configured to supply power and receive energy from both regenerative braking and "regenerated suspension energy";
- a controller that uses sensor inputs to "transition" between a first, second, and at least a third mode of operation.
- Essential elements of claim 10 (a method claim):
- replacing an existing suspension assembly with a hybridizing one;
- coupling a controller to the electric motor-generator;
- coupling a battery array to store energy regenerated from both the motor-generator and one or more shocks of the suspension.
U.S. Patent No. 10,245,972 - "Trailer-Based Energy Capture and Management"
Technology Synopsis
This patent describes a system for a towed vehicle (trailer) that uses an electrically powered drive axle to supplement the towing vehicle's primary motive forces '972 Patent, abstract A central feature is an "auxiliary power unit (APU) interface" that allows the trailer's onboard energy store to supply electrical power back to the towing vehicle, for functions such as powering heating or cooling systems '972 Patent, col. 2:47-54
Asserted Claims
Independent claims 1, 4, 7, and 10 Compl. ¶63
Accused Features
The complaint alleges infringement is directed at the eTrailer System Compl. ¶62 Range Energy argues non-infringement based on its product being a "kit" rather than a "towed vehicle," and on the alleged absence of an APU interface for supplying power to a towing vehicle Compl. ¶¶68-70
U.S. Patent No. 10,384,560 - "Motor Vehicle Accessory to Increase Power Supply and Reduce Fuel Requirements"
Technology Synopsis
The patent discloses a suspension assembly apparatus for a vehicle that includes an electric motor-generator coupled to a wheel to provide supplemental motive force or regenerative braking '560 Patent, abstract A controller uses sensor input to "transition" the motor-generator between a first mode (motive), a second mode (regenerative), and at least a third mode of operation '560 Patent, claim 1
Asserted Claims
Independent claims 1, 11, and 18 Compl. ¶80
Accused Features
The eTrailer System is accused of infringement Compl. ¶79 Range Energy asserts that its system does not operate in three distinct modes and lacks a controller that performs the claimed "transition" function Compl. ¶¶84-85
U.S. Patent No. 10,654,369 - "Motor Vehicle Accessory to Increase Power Supply and Reduce Fuel Requirements"
Technology Synopsis
This patent describes an apparatus for a tractor-trailer vehicle featuring an electric motor-generator and a controller. The controller is distinguished by its function to "receive sensor inputs from a plurality of different types of sensors, compare the plurality of sensor inputs to predetermined, corresponding threshold values," and then control the motor-generator to select one of three operational modes '369 Patent, claim 1
Asserted Claims
Independent claims 1 and 9 Compl. ¶95
Accused Features
The eTrailer System is accused of infringement Compl. ¶94 Range Energy counters that its system does not operate in three modes and does not include a controller that compares inputs from a "plurality of different types of sensors" to thresholds as claimed Compl. ¶¶98-99
U.S. Patent No. 10,821,853 - "Vehicle Energy Management System and Related Methods"
Technology Synopsis
The patent discloses a trailer with on-board sensors for detecting data such as position, weight, and speed '853 Patent, claim 16 A control system uses this data to compute a total estimated torque required to maintain a substantially constant speed. It also computationally estimates the torque being applied by the towing vehicle and uses both estimates to apply a specific torque to the trailer axles via an electric motor-generator '853 Patent, abstract
Asserted Claims
Independent claim 16 Compl. ¶103
Accused Features
The eTrailer System is accused of infringement Compl. ¶102 Range Energy argues its system's computations are directed at achieving "weightlessness" for the tractor, not maintaining a "substantially constant speed," and that it does not computationally estimate the torque applied by the towing vehicle Compl. ¶¶106-108
U.S. Patent No. 10,967,742 - "Motor Vehicle Accessory to Increase Power Supply and Reduce Fuel Requirements"
Technology Synopsis
The invention claims a trailer comprising one or more on-trailer motor-generators that are responsive to a controller. The controller uses sensor inputs to "independently transition each" motor-generator between an assistive motive mode and a regenerative braking mode based on different sensory conditions '742 Patent, claim 1
Asserted Claims
Independent claim 1 Compl. ¶111
Accused Features
The eTrailer System is accused of infringement Compl. ¶110 Range Energy alleges non-infringement on the basis that it provides "kits" not "trailers," its systems do not operate in distinct, transitioning modes, and its controller does not "independently transition" motors as required Compl. ¶¶113-116
U.S. Patent No. 12,024,029 - "Trailer-Based Energy Capture and Management"
Technology Synopsis
The patent describes a towed vehicle with an electric motor-generator providing positive motive force in a first mode and receiving negative rotational force for regenerative braking in a second mode '029 Patent, claim 1 A key feature is a controller that "operates autonomously from the towed vehicle" and transitions the motor-generator between modes based on sensor data '029 Patent, claim 1, element E
Asserted Claims
Independent claim 1 Compl. ¶118
Accused Features
The eTrailer System is accused of infringement Compl. ¶117 Range Energy argues its system is not a "towed vehicle," does not operate in the claimed modes, and includes controllers that "dictate the control" of the system, meaning they are not "autonomous" from it Compl. ¶¶120-123 Compl. ¶128
III. The Accused Instrumentality
Product Identification
Range Energy's "eTrailer System" Compl. ¶23
Functionality and Market Context
The accused instrumentality is described as "electrically-powered trailer component kits to upfit existing trailers" Compl. ¶23 The complaint consistently characterizes the product as a "kit" that does not include all components of a full "suspension assembly" and is installed by customers, not Range Energy Compl. ¶43 Compl. ¶46 Functionally, Range Energy alleges its system's electric power components are an "integral part of the drive axle, not coupled to the drive axle" Compl. ¶44 Compl. ¶51 It is further alleged that the system operates in a single, continuous mode rather than transitioning between distinct assistive and regenerative modes Compl. ¶45 The system's control logic is described as being directed at achieving "weightlessness" for the towing tractor, rather than maintaining a specific vehicle speed Compl. ¶106 The complaint states Range Energy is an early-stage company that has not yet generated revenue Compl. ¶28 No probative visual evidence provided in complaint.
IV. Analysis of Infringement Allegations
U.S. Patent No. 9,694,712
| Claim Element (from Independent Claim 8) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| a method comprising: replacing an existing suspension assembly of a trailer with a hybridizing suspension assembly... | Plaintiff alleges it does not perform this step, as it provides a kit for customers to install, and its instructions are for installation, not removal of the existing assembly. | ¶43 | col. 8:10-13 |
| wherein the hybridizing suspension assembly includes a frame, suspension, one or more drive axles, and at least one electric motor-generator... | Plaintiff alleges it provides kits that "do not include suspension equipment." | ¶46 | col. 7:65-col. 8:1 |
| ...electric motor-generator coupled to at least one of the one or more drive axles... | Plaintiff alleges its system's electric power system is an "integral part of the drive axle, not coupled to the drive axle." | ¶44 | col. 7:1-2 |
| ...to provide, in a first mode of operation, an assistive motive force and, in a second mode of operation, a regenerative braking force... | Plaintiff alleges its system remains in the same mode during all operations and that it receives rather than provides force. | ¶45 | col. 8:14-29 |
U.S. Patent No. 9,802,508
| Claim Element (from Independent Claim 1) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| an apparatus for use in a tractor-trailer vehicle configuration as a hybridizing suspension assembly... a suspension assembly including a frame, suspension, and one or more drive axles... | Plaintiff alleges it does not provide "suspension assemblies," but rather provides kits that do not include suspension equipment. | ¶55 | col. 7:3-6 |
| ...the suspension assembly including at least one electric motor-generator coupled to at least one of the one or more drive axles... | Plaintiff alleges its system's electric power system is an integral part of the drive axle, not "coupled to" it. | ¶51 | col. 7:7-8 |
| ...the battery array further configured to receive regenerated suspension energy... | Plaintiff alleges its systems only receive regenerated energy from braking, not from the suspension. | ¶53 | col. 12:24-27 |
| a controller operatively coupled... to transition between the first, the second and at least a third mode of operation... | Plaintiff alleges its systems do not include controllers that transition between modes and that this claim language invokes means-plus-function treatment. | ¶54 | col. 8:35-41 |
Identified Points of Contention
- Product-by-Process vs. Method: A primary dispute for method claims, such as claim 8 of the '712 patent, will be whether Range Energy can be held liable for the "replacing" step, which is performed by its customers. This raises questions of divided infringement and inducement Compl. ¶43
- System vs. Kit: A recurring issue across multiple patents is whether Range Energy's "eTrailer System," sold as a "kit," satisfies claim limitations reciting a complete "suspension assembly" or "towed vehicle." This suggests a fundamental dispute over whether the accused product meets the preambles and structural elements of the claims (Compl. ¶46; Compl. ¶68).
- Functional Mismatch: Range Energy consistently alleges a mismatch between the claimed multi-mode operation (e.g., assistive, regenerative, passive) and the accused system's alleged "single mode" functionality. This points to a potential non-infringement argument based on a lack of functional equivalence Compl. ¶45 Compl. ¶52 Compl. ¶84
- Means-Plus-Function Interpretation: The complaint repeatedly asserts that claim terms like "controller...to transition" are means-plus-function limitations under 35 U.S.C. § 112(f). The case may turn on whether the court agrees with this characterization and, if so, whether the patent specifications disclose adequate corresponding structure that is present in the accused system Compl. ¶54 Compl. ¶85 Compl. ¶99
V. Key Claim Terms for Construction
"replacing" ('712 Patent, claim 8)
Context and Importance
As the first step of a method claim, the construction of this term is critical for determining infringement. Range Energy sells a kit and argues it does not "replace" anything itself, making the definition central to both direct and indirect infringement analyses Compl. ¶43
Intrinsic Evidence for Interpretation
- Evidence for a Broader Interpretation: The patent repeatedly frames the invention as a "replacement for an existing suspension assembly" '712 Patent, claim 6 A party could argue the term encompasses the entire commercial process of providing a system intended for and instructed to be used as a replacement.
- Evidence for a Narrower Interpretation: The plain meaning suggests the physical act of removal and installation. The patent's description of replacing a "passive tandem axle with a powered tandem axle" '712 Patent, col. 8:10-13 may support a construction focused on the physical act performed by an installer, not the seller of the kit.
"suspension assembly" ('508 Patent, claim 1)
Context and Importance
Range Energy's core non-infringement argument is that it provides a "kit" that does not include "suspension equipment," and therefore does not provide a complete "suspension assembly" Compl. ¶55 The scope of this term will determine if the accused product meets this foundational structural limitation.
Intrinsic Evidence for Interpretation
- Evidence for a Broader Interpretation: Claim 1 itself defines the assembly as "comprising: a suspension assembly including a frame, suspension, and one or more drive axles." A party could argue that if the accused kit includes the novel and essential components (e.g., the frame and powered axle), it constitutes the claimed "assembly," even if commodity parts like springs are sourced separately.
- Evidence for a Narrower Interpretation: The explicit recitation of "suspension" as a component separate from the "frame" and "drive axles" suggests it is a required element. A party could argue that a kit lacking this element, as alleged by Range Energy, cannot be a "suspension assembly" as claimed.
"controller... to transition" ('508 Patent, claim 1)
Context and Importance
Range Energy alleges this is a means-plus-function term under 35 U.S.C. § 112(f) Compl. ¶54 Its construction is critical because if it is a means-plus-function term, infringement requires the accused device to have the specific structure (or an equivalent) disclosed in the patent for performing the "transitioning" function. Practitioners may focus on this term because it appears in various forms across multiple asserted patents.
Intrinsic Evidence for Interpretation
- Evidence for a Broader Interpretation (Not Means-Plus-Function): A party could argue that "controller" is a well-understood term of art for a structural component (e.g., a processor, a circuit) and that "to transition" simply describes its function, thus avoiding means-plus-function treatment.
- Evidence for a Narrower Interpretation (Means-Plus-Function): The phrasing "controller... to [function]" strongly resembles the template for means-plus-function claiming. The specification describes the function of transitioning between a "power assist mode," a "regeneration mode," and a "passive mode" '508 Patent, col. 8:15-36 The corresponding structure would be the "control system 150" and the specific algorithms disclosed for making these transitions, which a party could argue are absent from the accused product.
VI. Other Allegations
Indirect Infringement
While the complaint seeks a declaration of non-infringement, its own allegations create a potential basis for a counterclaim of induced infringement from Hyliion. Range Energy states that it provides "instructions on the installation of its system" and that a "customer would install that system," including the step of "replacing" the existing assembly Compl. ¶43 Compl. ¶56 These facts may be used by Hyliion to allege that Range Energy actively encourages and provides the means for its customers to perform the steps of the asserted method claims.
Willful Infringement
The complaint details extensive pre-suit communications in which Hyliion explicitly notified Range Energy of its patents and infringement allegations. Hyliion's initial letter on August 15, 2025 included 29 pages of claim charts for two patents Compl. ¶15 Hyliion later expanded its allegations to six additional patents on March 10, 2026 Compl. ¶35 This documented history provides a basis for Hyliion to allege that any infringement by Range Energy after receiving these communications was willful.
VII. Analyst's Conclusion: Key Questions for the Case
- A primary issue will be one of definitional scope: does Range Energy's "eTrailer System," which is sold as a component "kit," meet the claim requirements for a complete "suspension assembly" or "towed vehicle," and can the method step of "replacing" an old assembly be legally attributed to Range Energy, which only provides the kit and instructions?
- A central technical question will be one of operational equivalence: does the accused system, which allegedly operates in a single mode to achieve tractor "weightlessness," perform the same function in substantially the same way to achieve the same result as the claimed inventions, which require a controller to explicitly "transition" between distinct modes of power assist, regenerative braking, and passive operation?
- A key legal question will concern claim construction: will the court interpret terms such as "controller...to transition" as means-plus-function limitations under 35 U.S.C. § 112(f)? The outcome of this construction will define the specific structural and algorithmic requirements for infringement, potentially narrowing the scope of the claims and focusing the dispute on the precise implementation of the parties' respective control systems.