Turbofan Engine Combustor Design Patent Landscape
Turbofan Engine Combustor Design Patent Landscape in 2026
The turbofan engine combustor design space is heavily consolidated, with RTX Corp and General Electric together commanding a dominant share of activity among the top filers; the field peaked in 2019 and annual volume has since eased, placing it in a late-stage maturity phase. Western aerospace primes hold the structural high ground, though Chinese state-owned engine developers are building a visible presence in gas-turbine and propulsion branches.
RTX Corp leads a highly concentrated field with General Electric as the closest challenger
RTX Corp ranks first with 490 patent records, well ahead of General Electric Co at 338 and United Technologies Corp at 258, establishing a clear three-entity leading tier among the top-ranked applicants.
The top five filers account for 59% of the combined total across the hundred largest filers, signaling a strongly consolidated competitive structure where a handful of incumbents set the technology agenda.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | RTX Corporation | 490 | |
| 2 | General Electric Company | 338 | |
| 3 | United Technologies Corporation | 258 | |
| 4 | PRATT & WHITNEY CANADA CORP | 107 | |
| 5 | Rolls-Royce PLC | 85 | |
| 6 | The Boeing Company | 66 | |
| 7 | SN DETUDE & DE CONSTR DE MOTEURS DAVIATION (S N E … | 61 | |
| 8 | Safran Aircraft Engines SAS | 54 | |
| 9 | AECC Commercial Aircraft Engine Co., Ltd. | 41 | |
| 10 | Rohr, Inc. | 40 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | ROLLS ROYCE DEUT LTD & CO KG | 39 | |
| 12 | IHI Corporation | 36 | |
| 13 | MTU Aero Engines GmbH | 30 | |
| 14 | AECC Shenyang Engine Research Institute | 28 | |
| 15 | Rolls-Royce North American Technologies Inc. | 27 | |
| 16 | Beijing Power Machinery Institute | 24 | |
| 17 | GE Aviation Systems LLC | 22 | |
| 18 | AECC Hunan Aviation Powerplant Research Institute | 19 | |
| 19 | EcoServices LLC | 18 | |
| 20 | Williams International Co. LLC | 18 |
The depth of RTX Corp’s lead — nearly 1.5 times General Electric’s count — suggests sustained, broad-portfolio investment rather than targeted niche coverage, making new frontal entry into core gas-turbine combustor claims difficult without differentiated technology.
Filing counts for the most recent 18–24 months are subject to publication lag and will rise as pending applications are published; apparent softness in 2024–2026 should not be read as a structural shift. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity peaked in 2019 and has moderated; gas-turbine plant and propulsion classes dominate the technology mix
The filing trend chart reveals a peak-and-ease pattern centred on 2019, while the technology composition chart shows that combustor-specific classification (F23R) is a minor branch relative to the broader gas-turbine and propulsion system classes that dominate the corpus.
Annual filing trend
Filings climbed from 88 in 2017 to a peak of 142 in 2019, then moderated to the 97–109 range through 2022 before declining sharply in 2023–2026; the 2023–2026 counts are materially under-reported due to publication lag and should not be treated as confirmed decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
F02C (Gas-turbine plants) is the dominant class by a wide margin, followed by F02K (Jet and reaction propulsion) and F01D (Turbines); F23R (Combustion chambers), the most directly combustor-specific class, appears as a relatively small branch at 69 records, indicating that most combustor innovations are filed under broader system-level classifications.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Turbofan engine with augmented combustion chamber …
A mixed flow turbofan engine in which a portion of the core engine exhaust gases are passed into a pilot zone chamber where fuel is added thereto for vaporization therewith and wherein the fan air is passed over a series of vortex generators so that the vortex flow fan air and the vaporized fuel mixture will mix and combust rapidly in an augmentation… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Geartrain coupling for a turbofan engine | 484 |
| 2 | Cooling air cooler for a gas turbofan engine | 340 |
| 3 | Turbofan engine having counterrotating compressor … | 208 |
| 4 | Variable drive gas turbine engine | 197 |
| 5 | Turbofan engine with a low pressure turbine driven… | 185 |
| 6 | Pod for a turbofan aero engine of the forward cont… | 181 |
| 7 | Lubrication cooling system for aircraft engine acc… | 162 |
| 8 | Turbofan engine assembly and method of assembling … | 159 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment decisions
Four structural observations — maturity stage, concentration, collaboration patterns, and geographic coverage — shape where entry or differentiation is realistic for new or smaller players.
Late-cycle field: annual volume has eased from the 2019 peak
The lifecycle evidence places this field in a Decline stage, with annual filings easing back from the 2019 peak of 142. On a multi-year basis the window still reflects substantial accumulated activity, but the directional signal for net-new broad combustor IP is one of consolidation rather than expansion. R&D investment is most defensible in differentiated sub-systems or adjacent enabling technologies rather than core combustor geometry.
Lifecycle: DeclineThree incumbents hold the structural high ground; tier gap is wide
RTX Corp (490 records), General Electric Co (338), and United Technologies Corp (258) form a dominant tier whose combined depth reflects decades of portfolio building. The gap to the fourth-ranked applicant, Pratt & Whitney Canada Corp at 107, is substantial. Challengers and new entrants face prior-art density that narrows claim space, making partnership, licensing, or highly targeted niche filing the more practical routes.
Highly concentratedCross-border co-filing is modest but strategically patterned
The most active co-filing pair is United Technologies Corp and MTU Aero Engines, with 20 joint filings, reflecting the long-standing V2500 and GTF program partnerships. Snecma and Hispano-Suiza account for 7 joint filings within the Safran group, and RTX Corp (Raytheon Technologies) with MTU Aero Engines adds another 4. Chinese state-owned developers AECC Commercial Aircraft Engine and AECC Shanghai Manufacturing co-filed twice, signaling early-stage domestic collaboration. The overall collaboration volume is low relative to solo filing, indicating the field is dominated by proprietary portfolio strategies.
Selective partnershipsUS and EPO lead; China is a growing third jurisdiction
The United States is the leading filing jurisdiction at 692 patent records, followed by the EPO at 573 and China at 363. Canada at 118 and WIPO PCT at 118 reflect the North American supply-chain footprint. China’s position as third jurisdiction, combined with the presence of multiple AECC entities in the applicant ranking, indicates that domestic Chinese combustor IP is growing but remains significantly behind the Western incumbents. Japan and the UK hold smaller but established positions.
US-EPO-China triangleGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| United Technologies Corporation | MTU Aero Engines AG | 20 |
| Snecma (Safran Aircraft Engines) | Hispano-Suiza | 7 |
| Rolls-Royce PLC | Rolls-Royce Corporation | 5 |
| Raytheon Technologies Corporation | MTU Aero Engines AG | 4 |
| General Electric Company | General Electric Deutschland Holding GmbH | 3 |
| AECC Commercial Aircraft Engine Co., Ltd. | AECC Shanghai Commercial Aircraft Engine Manufacturing Co., Ltd. | 2 |
| United Technologies Corporation | MITU AERO ENGINES AG | 1 |
| General Electric Company | GE Avio S.r.l. | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
RTX Corp and General Electric dominate, with diverging recent momentum
The two largest filers share a focus on F02C gas-turbine plant and F02K propulsion classifications, but their recent filing trajectories diverge sharply — General Electric is accelerating while RTX Corp entities show contraction.
RTX Corp
RTX Corp holds 490 patent records, the largest portfolio in the ranking, concentrated in F02C 7 (Gas-turbine plant auxiliaries), F02K 3 (Jet propulsion), and F02C 3 (Gas-turbine cycle), reflecting broad system-level coverage. Its trajectory shows a –62% trend in recent filings versus the prior period, consistent with post-merger portfolio rationalization following the United Technologies–Raytheon combination. United Technologies Corp (258 records) is tracked separately in the ranking but represents the legacy RTX entity.
490 patent recordsGeneral Electric Co
General Electric Co ranks second at 338 patent records and shares the same dominant IPC focus areas — F02C 7, F02K 3, and F02C 3 — as RTX Corp. Its recent-period momentum stands at 4.8 times the prior three-year level, making it the standout accelerator among major filers. This surge likely reflects GE Aerospace’s independent strategic focus following the GE industrial breakup and its investment in next-generation open-fan and RISE program technologies.
338 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| General Electric Company | 53 | ▲ 4.8× vs prior 3-yr |
| Raytheon Technologies Corporation | 24 | ▼ -62% |
| Pratt & Whitney Canada Corp | 16 | ▼ -43% |
| Rolls-Royce PLC | 1 | ▼ -98% |
| The Boeing Company | 2 | ▼ -86% |
| AECC Commercial Aircraft Engine Co., Ltd. | 6 | ▼ -62% |
Under-served branches where combustor-adjacent innovation is sparse relative to system-level coverage
Several IPC classes appear at low share relative to the dominant gas-turbine and propulsion classes; two stand out for their technical adjacency to combustor design and their realistic entry paths for differentiated research.
F23R · Combustion Chambers (dedicated combustor classification)
F23R — the IPC class most directly describing combustion chamber architecture — accounts for only 69 patent records, representing roughly 1% of the technology composition, despite being the nominal home of combustor-specific innovations. This sparsity relative to the corpus size suggests that most combustor IP is filed under broader F02C system claims, potentially leaving targeted combustor-geometry, liner-cooling, and emissions-reduction claims underexplored as standalone F23R filings. For teams working on sustainable aviation fuel (SAF) combustor adaptation or low-NOx liner design, direct F23R prosecution could differentiate a portfolio from the crowded F02C landscape.
Search this in Eureka →F16H · Gearing and Transmissions (geared-turbofan integration)
F16H (Gearing and transmissions) appears at 166 patent records — approximately 3% of the technology composition — despite the geared turbofan architecture being central to next-generation fuel efficiency. The most-cited patent in the corpus, concerning geartrain coupling for a turbofan engine, accumulated 484 citations, signaling high technical relevance but relatively sparse further filing in this class. Teams focused on planetary gearbox integration, gear-mesh dynamics under combustor vibration loads, or hybrid-electric drivetrain coupling may find available claim space in this branch.
Search this in Eureka →How leading filers differ across gas-turbine, propulsion, and turbine sub-classes
Strength of each leader across the main technology routes.
| Player | F02C 7 · Gas-turbine plants | F02K 3 · Jet & reaction propulsion | F01D 25 · Turbines & non-positive engines | F02C 3 · Gas-turbine plants | F04D 29 · Non-positive-displacement pumps |
|---|---|---|---|---|---|
| United Technologies Corporation | Strong · 568 | Strong · 331 | Moderate · 242 | Moderate · 243 | Emerging · 74 |
| General Electric Company | Strong · 259 | Strong · 195 | Moderate · 82 | Moderate · 98 | Emerging · 31 |
| Raytheon Technologies Corporation | Strong · 117 | Strong · 69 | Moderate · 49 | Strong · 60 | Emerging · 22 |
| Pratt & Whitney Canada Corp | Strong · 95 | Moderate · 27 | Moderate · 24 | Absent | Emerging · 9 |
| Rolls-Royce PLC | Strong · 63 | Moderate · 27 | Moderate · 13 | Emerging · 8 | Absent |
| Snecma (Safran Aircraft Engines) | Strong · 60 | Moderate · 30 | Moderate · 20 | Absent | Absent |
| The Boeing Company | Strong · 65 | Absent | Absent | Absent | Absent |
Frequently asked questions
The evidence covers 815 patent families in scope for turbofan engine combustor design, representing a substantial body of accumulated IP across global jurisdictions.
RTX Corp ranks first with 490 patent records in the top-100 applicant ranking, followed by General Electric Co at 338 and United Technologies Corp at 258. These three entities form a dominant leading tier well ahead of all other filers.
The field peaked in 2019 at 142 filings and annual volume has eased since then, placing it in a Decline lifecycle stage. However, counts for the most recent 18–24 months are under-reported due to publication lag, so the full trajectory of very recent years is not yet confirmed.
The United States leads at 692 patent records, followed by the EPO at 573 and China at 363. Canada and WIPO PCT each account for 118 records, reflecting the North American industrial base. Japan and the United Kingdom hold smaller but established positions.
The most-cited work in the corpus concerns geartrain coupling for a turbofan engine with 484 citations, followed by a cooling air cooler for a gas turbofan engine at 340 citations and a counterrotating compressor turbofan at 208 citations. These highly cited patents cluster around propulsion architecture and thermal management rather than combustor chemistry directly.
General Electric Co shows the strongest positive momentum among major filers, with recent filings running at 4.8 times the prior three-year level. Most other top applicants show contraction: Rolls-Royce PLC is down approximately 98% in recent filings versus the prior period, Boeing is down approximately 86%, and both RTX Corp (Raytheon Technologies) and AECC Commercial Aircraft Engine are down approximately 62%.
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Disclaimer. This page is generated from PatSnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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