DCT
1:26-cv-00432
Ingenco Holdings LLC v. Waste Management Inc
Key Events
Complaint
Table of Contents
complaint Intelligence
I. Executive Summary and Procedural Information
- Parties & Counsel:
- Plaintiff: Ingenco Holdings, LLC (Delaware); Bio-Energy (Washington), LLC (Delaware)
- Defendant: Waste Management, Inc. (Delaware); WM Renewable Energy, L.L.C. (Delaware)
- Plaintiff's Counsel: Shaw Keller LLP
- Case Identification: 1:26-cv-00432, D. Del., 04/15/2026
- Venue Allegations: Venue is alleged to be proper in the District of Delaware because both defendants are incorporated or organized under Delaware law and therefore reside in the district for patent venue purposes.
- Core Dispute: Plaintiffs allege that Defendants' sixteen landfill renewable natural gas (RNG) facilities infringe a patent covering methods for purifying contaminated landfill gas.
- Technical Context: The technology concerns the purification of low-quality gas from sources like landfills to produce pipeline-grade methane, a process central to the renewable natural gas market.
- Key Procedural History: The complaint outlines a complex licensing history where Defendants received equipment-specific "Label Licenses" from a third party, Air Liquide. Plaintiffs allege these licenses did not authorize "project-wide" use of the patented method and explicitly required Defendants to obtain a broader project license from Plaintiff Bio-Energy (Washington), LLC, which they allegedly failed to do. The complaint also cites pre-suit demand letters sent in March 2026, which allegedly went unanswered.
Case Timeline
| Date | Event |
|---|---|
| 2005-10-28 | '779 Patent Priority Date |
| 2010-06-08 | '779 Patent Issue Date |
| 2012-02-15 | License Agreement between IPGCo and Air Liquide |
| 2015-05-26 | '779 Patent assigned from IPGCo to Bio-Energy (Washington), LLC |
| 2023-03-14 | '779 Patent assigned from Bio-Energy (Washington), LLC to Ingenco Holdings, LLC |
| 2026-03-12 | Plaintiffs' counsel sends demand letter to Defendants |
| 2026-03-25 | Plaintiffs' counsel sends Inspection Notice to Defendants |
| 2026-03-26 | FedEx confirms delivery of demand and notice letters |
| 2026-03-31 | JPMCB executes Release of Patent Security Agreement for the '779 Patent |
| 2026-04-15 | Complaint Filed |
II. Technology and Patent(s)-in-Suit Analysis
U.S. Patent No. 7,731,779 - "Method for Processing Landfill and Other Stranded Gas Containing Commercial Quantities of Methane and Contaminated by Carbon Dioxide, Nitrogen and Oxygen into a Pipeline or Vehicle Quality Natural Gas Product"
- Patent Identification: U.S. Patent No. 7,731,779, "Method for Processing Landfill and Other Stranded Gas Containing Commercial Quantities of Methane and Contaminated by Carbon Dioxide, Nitrogen and Oxygen into a Pipeline or Vehicle Quality Natural Gas Product," issued June 8, 2010.
The Invention Explained
- Problem Addressed: The patent addresses the economic challenge of purifying "stranded" gas sources, such as landfill gas (LFG), which are heavily contaminated with carbon dioxide, nitrogen, and oxygen (collectively, "air components") '779 Patent, col. 1:31-34 '779 Patent, col. 1:53-56 Traditional cryogenic (low-temperature) purification methods are described as too capital-intensive and energy-consuming for the modest gas flows typical of landfills, leading to this potential energy source being wasted or flared '779 Patent, col. 2:13-24
- The Patented Solution: The '779 Patent discloses a non-cryogenic, multi-step method for processing this contaminated gas into a pipeline-quality product '779 Patent, abstract The process uses a series of modular components, including pressure swing adsorption (PSA) units to remove water and organic compounds, followed by process membranes to remove carbon dioxide, and a final PSA stage to remove nitrogen '779 Patent, col. 3:30-41 '779 Patent, col. 4:4-11 A key feature is the recycling of the "permeate" (a waste stream rich in CO2 from the membrane step) back into the system to increase the overall recovery of valuable methane '779 Patent, col. 3:59-64
- Technical Importance: The invention provides a claimed method for making the recovery of methane from contaminated, low-volume gas sources economically viable for injection into existing natural gas pipelines without requiring blending '779 Patent, col. 2:6-12
Key Claims at a Glance
- The complaint asserts infringement of one or more claims, identifying independent claims 1 and 4 '779 Patent, ¶15 '779 Patent, ¶33
- Independent Claim 1 recites a method with the following essential steps:
- removing hydrogen sulfide from the gas;
- compressing the gas;
- cooling the gas;
- removing water, non methane organic compounds, and volatile organic compounds using one or more pressure swing adsorption units;
- removing carbon dioxide and oxygen using process membranes;
- removing nitrogen and oxygen using one or more pressure swing adsorption units;
- wherein the membrane step produces a permeate that is recycled to improve methane recovery.
- Independent Claim 4 recites a similar multi-step method, but specifies that the permeate from the membrane step is used in the earlier step of removing water and organic compounds with the pressure swing adsorption units.
III. The Accused Instrumentality
Product Identification
- The accused instrumentalities are sixteen landfill gas-to-RNG facilities owned and operated by Defendant WM Renewable Energy across the United States '779 Patent, ¶21 '779 Patent, ¶22
Functionality and Market Context
- The complaint alleges that these facilities practice the patented methods to process raw landfill gas into "pipeline-quality RNG for injection into natural gas pipeline systems" '779 Patent, ¶21 The output of these facilities is alleged to generate "substantial revenues" from natural gas sales and the sale of environmental credits, such as Renewable Identification Numbers (RINs) and Low Carbon Fuel Standard (LCFS) credits '779 Patent, ¶24
IV. Analysis of Infringement Allegations
The infringement theory is based on the allegation that Defendants' sixteen RNG facilities operate a gas purification process that practices every step of the claimed methods '779 Patent, ¶23 No probative visual evidence provided in complaint.
- '779 Patent Infringement Allegations
| Claim Element (from Independent Claim 1) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| removing hydrogen sulfide from the gas | The operation of a system that includes "removal of hydrogen sulfide" | ¶23 | col. 3:32-38 |
| compressing the gas | The operation of a system that includes "compression" | ¶23 | col. 3:38-41 |
| cooling the gas | The operation of a system that includes "cooling" | ¶23 | col. 3:38-41 |
| removing water, non methane organic compounds, and volatile organic compounds using one or more pressure swing adsorption units | The operation of a system that includes "removal of water, NMOCs, and VOCs using pressure swing adsorption units" | ¶23 | col. 3:41-51 |
| removing carbon dioxide and oxygen using process membranes | The operation of a system that includes "removal of carbon dioxide and oxygen using Air Liquide process membranes" | ¶23 | col. 3:54-59 |
| removing nitrogen and oxygen using one or more pressure swing adsorption units | The operation of a system that includes "removal of nitrogen and oxygen using pressure swing adsorption units" | ¶23 | col. 4:4-11 |
| wherein the step of removing carbon dioxide and oxygen using process membranes produces permeate which is then used in the step of recycling the gas to improve methane recovery | The operation of a system "with membrane permeate recycled to improve methane recovery" | ¶23 | col. 3:59-64 |
- Identified Points of Contention:
- License Scope Question: The complaint's primary focus is on the scope of "Label License Agreements" that Defendants obtained from Air Liquide '779 Patent, ¶17 A central question for the court will be whether these equipment-specific licenses authorized the practice of the entire multi-step patented method, or if, as Plaintiffs allege, they only covered the use of the specific Air Liquide membrane equipment and left Defendants infringing by performing the other claimed steps without a "project-wide license" from BEW '779 Patent, ¶18 '779 Patent, ¶19
- Technical Question: While the complaint maps the accused process to the claim elements, the allegations are conclusory '779 Patent, ¶23 A factual dispute may arise regarding whether the accused systems perform each step exactly as claimed. For instance, the distinction between the general recycling step in claim 1 and the more specific recycling step in claim 4 raises the question of what recycling method is actually practiced at the accused facilities.
V. Key Claim Terms for Construction
The Term: "pressure swing adsorption units"
Context and Importance: This term appears in multiple limitations of the independent claims and is fundamental to the purification process '779 Patent, claim 1 Practitioners may focus on this term because the specific technology used by the Defendants for removing impurities will be compared against the patent's description. The outcome of its construction could determine whether the accused equipment falls within the scope of the claims.
Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The claims and specification refer to the units functionally, as serving "for removal of water and nearly all non methane organic compounds (NMOC's) and volatile organic compounds (VOC's)" '779 Patent, col. 3:41-45 This functional language may support an interpretation covering any unit that performs this function via pressure swing adsorption.
- Evidence for a Narrower Interpretation: The specification provides a specific example for a different PSA step (nitrogen rejection), noting the "Molecular Gate™ provided by BASF" as an example technology '779 Patent, col. 4:6-8 A party could argue that the term should be construed more narrowly to encompass only technologies with characteristics similar to the embodiments disclosed.
The Term: "recycling the gas to improve methane recovery"
Context and Importance: This phrase from the "wherein" clause of claim 1 is a critical limitation that distinguishes the overall process '779 Patent, claim 1 Its interpretation will be central to determining infringement, as the specific path and purpose of the recycled permeate stream in the accused systems will be scrutinized.
Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The specification describes an embodiment where the permeate "is either recycled back to the inlet of the compressors (102) or used as the regenerative gas for the PSA's" '779 Patent, col. 3:61-64 This disclosure of multiple recycling options could support a broader construction that is not limited to a single specific recycling path.
- Evidence for a Narrower Interpretation: The phrase "to improve methane recovery" could be interpreted to require a specific technical outcome or a particular level of efficiency improvement. A party might also contrast this general phrase with the more specific recycling limitation in claim 4, arguing that the terms must have different scopes, thus limiting the meaning of the phrase in claim 1.
VI. Other Allegations
- Indirect Infringement: The complaint alleges that parent company Waste Management, Inc. induces infringement by its subsidiary, WM Renewable Energy '779 Patent, ¶34 The basis for inducement is the allegation that the parent company directs and controls the subsidiary's infringing operations with actual knowledge of the '779 Patent, where knowledge is based on the Label License Agreements that expressly identified the patent '779 Patent, ¶25 '779 Patent, ¶34
- Willful Infringement: Willfulness is a central allegation. The complaint alleges Defendants had actual, pre-suit knowledge of the '779 Patent from the moment they executed the Label License Agreements, which identified the patent by number and designated BEW as the source for a required "project-wide" license '779 Patent, ¶25 The willfulness claim is further supported by allegations that Defendants continued to infringe after receiving a formal demand letter in March 2026 '779 Patent, ¶26 '779 Patent, ¶30
VII. Analyst's Conclusion: Key Questions for the Case
The resolution of this dispute may hinge on the court's determination of two primary issues:
A core issue will be one of license scope: Did the equipment-specific "Label Licenses" granted by Air Liquide provide Defendants with the authority to practice the entire patented multi-step method, or was a separate, "project-wide" license from the Plaintiffs required? This question blends principles of patent exhaustion and contract interpretation.
A key evidentiary question will be one of technical correspondence: Assuming the license provides no defense, does the process at each of the sixteen accused facilities meet every limitation of an asserted claim? Discovery will be needed to establish the precise operational details of the accused systems, particularly regarding the function of the adsorption units and the specific method used for permeate recycling.
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