On July 7, 2026, Airbus and MTU Aero Engines announced an agreement to establish a joint venture to develop a fully electric hydrogen fuel cell engine for commercial aviation.
The new entity, which builds on a Memorandum of Understanding signed at the Paris Air Show in June 2025, is scheduled to begin operations in 2027. Under the agreement, Airbus will contribute its expertise in commercial aircraft design and liquid hydrogen systems, while MTU will manage engine design, fuel cell technology development, and certification processes. The partnership’s objective is to design and test a propulsion system that generates electricity through an electrochemical reaction, producing only water vapor as a byproduct.
From traditional aviation to the “Flying Fuel Cell”
The Munich-headquartered company operates across three core divisions: commercial original equipment manufacturing (OEM), military engine production, and maintenance, repair, and overhaul (MRO) services. Historically a key partner in European defense programs, such as the development of the RB199 engine for the Tornado combat aircraft, MTU currently serves as the industrial lead for the German Armed Forces. In the commercial sector, the company functions as a major global supplier and maintenance provider for engines used across various thrust and power categories.
In recent years, MTU Aero Engines has directed its research and development toward sustainable aviation and zero-emission propulsion systems. A central component of this transition is the “Flying Fuel Cell” (FFC) program, which aims to develop a climate-neutral powertrain architecture for commercial aircraft, a concept detailed in depth in their technical publications. To support this initiative, the company has completed initial testing of its eMoSys electric motor and established dedicated fuel cell testing facilities in Munich. Additionally, the aircraft engine manufacturer leads the HEROPS (Hydrogen-Electric Zero Emission Propulsion System) project under the European Clean Aviation initiative, focusing on maturing these hydrogen-electric technologies for future integration into commercial flight.
The following sections examine MTU Aero Engines’ broader patenting activity, followed by a detailed look at their specific patents covering electric power plants and fuel cell systems. These documents protect the proprietary technologies that serve as the fundamental framework for the propulsion architecture as a whole.
MTU Aero Engines: Patenting Activity
MTU Aero Engines’ patent activity over the past decade reflects the company’s evolving priorities in commercial aviation, maintenance, and sustainable propulsion. Its intellectual property portfolio expanded alongside the growth of its maintenance operations and strategic partnerships, including the establishment of the EME Aero joint venture with Lufthansa Technik. The company also strengthened its innovation efforts through the development of climate-neutral propulsion technologies and the introduction of its ecoRoadmap strategy, which aims to achieve climate-neutral production.
The company’s patent activity also aligns with continued expansion of its maintenance business and participation in major sustainability initiatives, including the Clean Aviation HEROPS project, which advances hydrogen-electric propulsion through the “Flying Fuel Cell” program. MTU further expanded its efforts in next-generation aviation through the finalization of its fuel cell stack design and a strategic collaboration with Airbus to advance hydrogen-electric aircraft technologies.
MTU Aero Engines: Top Jurisdictions
The majority of the company’s intellectual property protection is concentrated in Europe, specifically through the European Patent Office and within Germany. This localized filing strategy aligns with the location of their corporate headquarters in Munich and their role as the primary industrial partner for the German Armed Forces.
Additionally, a substantial portion of their portfolio is filed in the United States. The company has a significant presence in the North American aerospace market, supported by regional subsidiaries such as MTU Aero Engines North America and major maintenance facilities operating in Texas.
Beyond its primary European and North American markets, the company strategically files patents across various international jurisdictions to protect its global maintenance, repair, and overhaul (MRO) network.
Filings in countries like Spain, China, and Poland coincide with the establishment of large-scale joint ventures, manufacturing hubs, and maintenance centers, including MTU Maintenance Zhuhai and MTU Aero Engines Polska. Furthermore, localized intellectual property protection in regions such as Brazil, Japan, and Singapore supports the company’s expanding on-site service centers and technical asset management operations across multiple continents.
MTU Aero Engines: Top Law Firms
MTU Aero Engines’ patent portfolio is primarily led by Davidson Kappel, Hinckley, Allen & Snyder, and Barlow, Josephs & Holmes (merged with Hinckley, Allen & Snyder in 2023). The use of these North American firms reflects the company’s focus on securing patent rights within the U.S. aerospace sector.
Beyond its primary U.S. representatives, MTU Aero Engines engages a network of international patent agencies and regional law firms to execute its global intellectual property strategy. The use of Chinese agencies like Guangzhou Zhiyou Patent & Trademark Agency and Wuxi Suyuan Patent Agency aligns with the company’s service presence in the Asian market, particularly through regional hubs like MTU Maintenance Zhuhai.
Concurrently, the company relies on German and European IP specialists, including König Szynka Tilmann von Renesse (Dusseldorf office joined with Hofsetter, Schurack & Partner, and the Munich office with Szynka Smorodin in 2025), Hofstetter, Schurack & Partner, and Szynka Smorodin, to manage specific filings within its domestic European base.
Specialized U.S. firms, such as Abel Schillinger and Leydig, Voit & Mayer, further supplement this network. This multi-jurisdictional legal framework enables MTU Aero Engines to navigate distinct regional patent offices and secure worldwide protection for its commercial and military aviation technologies.
MTU Aero Engines: Top Technology Areas
The single largest portion of the company’s global filings is dedicated to non-positive displacement Machines or Engines (F01D), highlighting the prioritization of core gas turbine and jet engine architectures. This is complemented by a substantial focus on turbomachinery and jet propulsion indexing (F05D), which represents the underlying aerodynamic mechanics and structural physics crucial to advanced flight hardware development.
Rounding out the top three categories is climate change mitigation technologies related to transportation (Y02T), emphasizing the engineering required to transition conventional aviation toward sustainable, low-emission propulsion systems.
The remaining classifications among the top ten cover a diverse array of specialized fluid dynamics, manufacturing techniques, and alternative aviation systems. Layers of protection are dedicated to F04D and F02C, aligning with the objectives of complex airflow management and gas turbine systems control. These areas are supported by component-level manufacturing patents under B33Y, B22F, and B23H, which secure the specialized additive processes, powder metallurgy, and electrode machining techniques used to construct high-stress turbine components. Finally, the portfolio is completed by smaller segments in B64D and H01M, reflecting the specialized aircraft mounting equipment and electrochemical power sources used to support next-generation aviation frameworks.
MTU Aero Engines: Featured Patents
The proprietary technologies that serve as the fundamental framework for MTU Aero Engines’ next-generation propulsion architecture are anchored within its core patent portfolio. While the company’s broader intellectual property filings span a wide array of turbine components and manufacturing methodologies, its recent strategic shift toward zero-emission flight has concentrated significant development on electric power plants and alternative fuel systems.
The following section examines the specific featured patents of MTU Aero Engines that protect these foundational designs, showcasing the engineering blueprints behind their electric engines and fuel cell systems.
Hydrogen-electric propulsion architecture
U.S. Pat. App. Pub. No. 2026/0159236 details the core architecture of a fuel-cell propulsion system designed for commercial and rotary-wing aircraft. The powertrain relies on at least one fuel cell that converts the chemically bound energy of hydrogen fuel into electrical energy. This generated electricity directly powers an electric propulsion apparatus, typically consisting of an electric motor. The electric motor then drives a mechanical propelling mechanism, such as a propeller, fan, or rotor, to generate the necessary thrust and lift for the aircraft.
To sustain the electrical demands of the motor, the propulsion system integrates a specialized fuel distribution and thermal management framework. Liquid hydrogen is drawn from a fuel store consisting of two horizontally aligned, cylindrical pressure tanks mounted parallel to the aircraft’s longitudinal axis. Because fuel cells generate waste heat during the electricity generation process, maintaining the powertrain’s operational temperature requires a dedicated cooling cycle. A liquid cooling medium circulates through the fuel cell to absorb waste heat and routes it directly to a roof-mounted main heat exchanger, keeping the propulsion system within its operating thermal limits during flight.
The physical placement of these components is arranged to optimize the efficiency of the overall powertrain. By grouping the main heat exchanger and the hydrogen fuel store together inside a streamlined exterior cowl on top of the fuselage, the design reduces the physical size of the engine nacelles on the wings, which modifies the airflow around the main propulsion zones. Furthermore, the system incorporates a secondary heat exchanger placed within the direct downwash region of the aircraft propeller. This configuration is designed to ensure that the propulsion system receives adequate forced-convection cooling during stationary ground operations when forward ram airflow is unavailable.
This patent application entitled “Aircraft having a fuel-cell propulsion system” was filed and published on April 11, 2025 and June 11, 2026 respectively. The listed inventors are Thomas Scherer, Barnaby Law, Stephan Lellek, and Jan Hägert.
Fuel cell air supply and thermal control system
U.S. Patent No. 12,559,250, entitled “Aircraft having a fuel cell and method for operating a fuel cell of an aircraft”, presents an aircraft fuel cell system that integrates a specialized air supply and thermal management architecture. The fuel cell generates electrical energy using a fuel and an oxidizing agent, a process that requires compressed air to achieve high operational efficiency.
To supply this required oxygen without relying entirely on mechanical compressors, the fuel cell is connected to an internal air duct that widens downstream of the main inlet. This diffuser-like expansion slows incoming ram or downwash air, naturally increasing its static pressure. A flow-through opening within this widening section then draws a portion of this pressurized air and routes it directly to the physically separated fuel cell to serve as its oxidizing agent.
The operation of this fuel cell system follows a sequential method to maximize both component cooling and overall aircraft thrust. First, ambient air enters the duct and undergoes aerodynamic compression within the widening section. While a dedicated compressor device may draw off and further pressurize a portion of this air for the fuel cell, the remaining airflow continues downstream to absorb waste heat from the fuel cell’s heat exchanger.
After passing over these cooling surfaces, the heated air enters a tapered section of the duct, where it accelerates. At this operational stage, the system directs the high-enthalpy exhaust air generated by the fuel cell back into this tapering region. Finally, this combined, energy-enriched airflow is discharged through an outlet opening, converting the absorbed thermal energy into usable thrust for the aircraft.
U.S. Patent No. 12,559,250 was filed on May 19, 2022 and was granted on February 24, 2026, with Stephan Lellek and Jan Hägert as the listed inventors. Davidson Kappel provided the legal representation.