Turbofan Blade-Disk Interface Patent Landscape 2026
The turbofan blade-disk interface space is dominated by a small group of established OEMs, with RTX Corp holding the largest portfolio among the top filers and the top five applicants together accounting for nearly three-quarters of the hundred largest filers’ combined output. Annual filing volume has retreated sharply from its 2019 peak, signaling a maturing, consolidating field rather than an expanding frontier.
RTX Corp leads a tightly consolidated field
RTX Corp sits atop the applicant ranking with 1,014 patent records, more than 60% ahead of its nearest rival General Electric Co at 622 patent records. United Technologies Corp, Rolls-Royce plc, and Rolls-Royce Corp round out the top five, confirming that a handful of incumbent aero-engine OEMs control this space.
The top five filers collectively hold 74% of the hundred largest filers’ combined total, an unusually high concentration that signals high barriers to entry and limited room for new entrants to establish broad portfolio positions without significant prior investment.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | RTX Corporation | 1,014 | |
| 2 | General Electric Company | 622 | |
| 3 | United Technologies Corporation | 483 | |
| 4 | Rolls-Royce plc | 392 | |
| 5 | Rolls-Royce Corporation | 213 | |
| 6 | PRATT & WHITNEY CANADA CORP | 177 | |
| 7 | Rolls-Royce North American Technologies Inc | 161 | |
| 8 | Honeywell International Inc | 101 | |
| 9 | Siemens Energy Inc | 67 | |
| 10 | Solar Turbines Inc | 47 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Rolls-Royce High Temperature Composites Inc | 34 | |
| 12 | SIEMENS ENERGY GLOBAL GMBH & CO KG | 28 | |
| 13 | Siemens AG | 25 | |
| 14 | GE Infrastructure Technology LLC | 25 | |
| 15 | Florida Turbine Technologies Inc | 22 | |
| 16 | ROLLS ROYCE DEUT LTD & CO KG | 15 | |
| 17 | General Electric Technology GmbH | 13 | |
| 18 | Oliver Crispin Robotics Ltd | 12 | |
| 19 | MECHANICAL DYNAMICS & ANALYSIS LLC | 12 | |
| 20 | Safran Aircraft Engines SAS | 11 |
The leaders’ positions reflect decades of cumulative investment in blade attachment geometry, disk stress management, and thermal interface engineering. Challengers seeking differentiated positions will need to identify sub-domains where the incumbents have lower coverage density.
Filing counts for the most recent 18–24 months should be treated as provisional due to standard publication lag; apparent declines in 2024–2025 likely understate actual recent activity. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A field past its 2019 peak, dominated by turbine-component classes
Annual filing activity and the technology class breakdown together reveal both the maturity trajectory and the structural priorities of this corpus: turbine-component fundamentals dominate, while manufacturing and materials classes remain secondary.
Annual filing trend
Filings peaked at 271 records in 2019 and have trended downward since, reaching 74 in 2023 and 70 in 2024. The 2025 and 2026 data points are incomplete due to publication lag and should not be read as indicative of the terminal trajectory. The overall recent-window decline of -61% relative to the prior period confirms the field has moved past its peak phase.
↗ Hover for values · click a bar to ask EurekaTechnology composition
F01D (Turbines and non-positive engines) is the dominant class by a wide margin, reflecting the core focus on blade and disk structural design. F02C (Gas-turbine plants) and F04D (Non-positive-displacement pumps) are secondary clusters, while manufacturing classes such as B23P (Metal working), C23C (Coating and surface deposition), and B23K (Welding, soldering and brazing) represent meaningful but smaller shares, indicating that process and materials innovation is adjacent rather than central.
↗ 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.
Spoked rotor for a gas turbine engine
A rotor for a gas turbine engine includes a plurality of blades which extend from a rotor disk at an interface, where the interface is defined along a spoke. A spool for a gas turbine engine includes the rotor disk, the plurality of blades with the interface defined along the spoke radially inboard of a blade platform, a rotor ring axially adjacent to the… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Evaporatively cooled rotor for a gas turbine engine | 353 |
| 2 | Microturbomachinery | 326 |
| 3 | Foreign object damage resistant composite blade an… | 251 |
| 4 | Thermal/environmental barrier coating for silicon-… | 243 |
| 5 | Ceramic matrix composite gas turbine vane | 221 |
| 6 | Ceramic thermal barrier coating with alumina inter… | 218 |
| 7 | Cooled airfoils for a gas turbine engine | 215 |
| 8 | Modulated turbine cooling system | 213 |
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
The combination of declining annual volume, high incumbent concentration, and a US-centric jurisdictional footprint shapes the risk-return calculus for new entrants and existing players alike.
Decline stage: annual volume easing from 2019 peak
The lifecycle evidence places this field in a Decline stage, with annual filings having eased back from the 2019 peak of 271 records. This indicates that core blade-disk attachment concepts are broadly patented and the marginal cost of establishing a novel position in mainstream sub-domains is high. R&D investment is better directed toward less-covered adjacencies or next-generation material systems rather than incremental improvements to well-explored geometries.
Lifecycle: DeclineTop five filers hold 74% of the hundred largest filers’ output
RTX Corp, General Electric Co, United Technologies Corp, Rolls-Royce plc, and Rolls-Royce Corp together account for 74% of the top-100 filers’ combined patent records. This level of concentration means that freedom-to-operate searches must prioritize these five portfolios above all others. New entrants face a dense prior-art landscape in mainstream blade-disk design and should expect significant opposition risk in core claim territories.
High concentrationRolls-Royce entities are the most active co-filers; GE-Oliver Crispin is a notable cross-sector pairing
The most active co-filing pair is Rolls-Royce Corp with Rolls-Royce North American Technologies Inc, sharing 80 joint filings, reflecting tightly coordinated transatlantic R&D within the Rolls-Royce group. Rolls-Royce plc co-files with Rolls-Royce High Temperature Composites Inc on 16 filings each alongside Rolls-Royce Corp, underscoring a composites-focused sub-alliance. General Electric Co and Oliver Crispin Robotics share 12 co-filings, suggesting a robotics-enabled inspection or repair collaboration at the blade-disk interface.
Intra-group alliancesUS and EPO filings dominate; Asian and emerging-market coverage is thin
The United States leads all jurisdictions with 1,603 patent records, followed by Europe via the EPO at 1,202. Canada and the United Kingdom are secondary markets. Japan holds only 20 records and China only 18, which is notably low for a component class with global aero-engine manufacturing relevance. This thin Asian coverage could represent either a deliberate strategic choice by incumbents or a gap that regional competitors might exploit for local market protection.
US/EPO centricGo 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 |
|---|---|---|
| Rolls-Royce Corporation | Rolls-Royce North American Technologies Inc | 80 |
| Rolls-Royce plc | Rolls-Royce High Temperature Composites Inc | 16 |
| Rolls-Royce Corporation | Rolls-Royce High Temperature Composites Inc | 16 |
| Rolls-Royce plc | Rolls-Royce North American Technologies Inc | 13 |
| Rolls-Royce North American Technologies Inc | Rolls-Royce High Temperature Composites Inc | 13 |
| General Electric Company | Oliver Crispin Robotics Ltd | 12 |
| Rolls-Royce plc | Rolls-Royce Corporation | 11 |
| General Electric Company | General Electric Co Polska Sp. z o.o. | 4 |
| Rolls-Royce plc | European Gas Turbines Ltd | 4 |
| Siemens Energy Inc | Siemens AG | 4 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
RTX Corp and General Electric Co lead; all major players show declining momentum
Every major incumbent has posted a year-on-year decline in recent filing activity, consistent with the field’s post-peak lifecycle stage. Technology focus across all leaders is concentrated in F01D5 (blade and turbine rotor components), with secondary differentiation in cooling, sealing, and plant-level integration.
RTX Corp
RTX Corp (which subsumes United Technologies Corp and Raytheon Technologies Corp portfolios) holds the largest position in the ranking at 1,014 patent records. Its technology emphasis is concentrated in F01D5 (1,093 records), F01D11 (324 records), and F01D25 (321 records), covering blade attachment, sealing, and bearing/support structures. Recent filing momentum shows a trend of -33% versus the prior period, consistent with portfolio consolidation following the RTX merger rather than strategic retreat.
patent records: 1,014General Electric Co
General Electric Co holds 622 patent records, with primary focus on F01D5 (645 records), F01D25 (158 records), and F01D9 (120 records), indicating broad blade, nozzle, and support-structure coverage. Its recent momentum trend is -30%, a shallower decline than Rolls-Royce’s -87%, suggesting GE is sustaining relatively more active filing in this space. The GE–Oliver Crispin Robotics co-filing relationship (12 joint filings) also points to emerging interest in robotic inspection at the blade-disk interface.
patent records: 622| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| General Electric Company | 33 | ▼ -30% |
| Rolls-Royce plc | 13 | ▼ -87% |
| Raytheon Technologies Corporation | 111 | ▼ -33% |
| Rolls-Royce Corporation | 5 | ▼ -87% |
| Pratt & Whitney Canada Corp | 17 | ▼ -50% |
| Rolls-Royce North American Technologies Inc | 2 | ▼ -83% |
| Honeywell International Inc | 10 | ▼ -17% |
| Siemens Energy Inc | 2 | ▲ new entrant |
Under-served branches adjacent to the blade-disk core
Several IPC branches appear at lower relative share within this corpus despite plausible technical relevance to blade-disk interface performance; they are observed as sparse rather than validated opportunities, but may warrant closer investigation for targeted entry.
B33Y · Additive Manufacturing (3D Printing)
B33Y appears with only 29 patent records in the corpus, a low share relative to the structural complexity of blade-disk interface geometries that are prime candidates for topology-optimized, additively manufactured designs. The technical value is plausible: AM enables internal cooling channels and near-net-shape dovetail features that are difficult to achieve by conventional forging. A realistic entry path would focus on process qualification and powder-bed fusion parameter sets specific to nickel superalloy disk and blade attachment zones, differentiating from the dense forging and casting prior art in B21K and B22D.
Search this in Eureka →F16F · Springs & Vibration Dampers
F16F holds only 31 patent records in the corpus despite the well-known importance of under-platform and root-section dampers in managing fretting fatigue and resonance at the blade-disk interface. The sparse coverage suggests that interface-specific vibration damping solutions have not been heavily patented as a standalone class, even though fretting and high-cycle fatigue are primary failure modes. An entry path through novel damper geometry, material, or coating approaches tuned to dovetail contact mechanics could find relatively open ground here, provided freedom-to-operate is confirmed against the dominant F01D5 claims of the incumbent OEMs.
Search this in Eureka →How leaders differ by technology route across blade-disk sub-domains
Route coverage across the main technology branches in the current evidence set.
| Player | F01D 5 · Turbines & non-positive engines | F01D 25 · Turbines & non-positive engines | F01D 11 · Turbines & non-positive engines | F01D 9 · Turbines & non-positive engines | F02C 7 · Gas-turbine plants |
|---|---|---|---|---|---|
| United Technologies Corporation | Strong · 1,093 | Moderate · 321 | Moderate · 324 | Moderate · 236 | Moderate · 264 |
| General Electric Company | Strong · 645 | Moderate · 158 | Emerging · 71 | Emerging · 120 | Emerging · 116 |
| Rolls-Royce plc | Strong · 376 | Emerging · 68 | Emerging · 59 | Emerging · 70 | Emerging · 36 |
| Raytheon Technologies Corporation | Strong · 327 | Moderate · 92 | Moderate · 67 | Emerging · 62 | Emerging · 57 |
| Rolls-Royce Corporation | Strong · 215 | Moderate · 49 | Moderate · 66 | Moderate · 52 | Emerging · 10 |
| Pratt & Whitney Canada Corp | Strong · 172 | Strong · 87 | Emerging · 15 | Emerging · 28 | Moderate · 49 |
| Rolls-Royce North American Technologies Inc | Strong · 151 | Moderate · 35 | Moderate · 33 | Emerging · 25 | Emerging · 5 |
Frequently asked questions
The corpus analyzed contains 1,335 patent families in scope. This covers blade-disk attachment, dovetail and fir-tree root designs, disk stress management, sealing, and related structural interface topics in turbofan and gas-turbine contexts.
RTX Corp leads the applicant ranking with 1,014 patent records, followed by General Electric Co with 622 and United Technologies Corp with 483. The top five applicants together account for 74% of the hundred largest filers’ combined patent records, indicating a highly concentrated competitive landscape.
No. The field is in a Decline lifecycle stage. Annual filings peaked at 271 records in 2019 and have eased back substantially since, reaching 74 in 2023 and 70 in 2024. The most recent data points (2025–2026) are incomplete due to publication lag, but the overall recent-window trend shows a -61% decline relative to the prior period.
The United States is the primary filing jurisdiction with 1,603 patent records, followed by Europe via the EPO at 1,202. Canada and the United Kingdom are secondary markets. Asian jurisdictions are notably thin: Japan holds 20 records and China holds 18, reflecting the predominantly Western incumbency in aero-engine OEM manufacturing.
F01D (Turbines and non-positive engines) is the dominant class by a wide margin. F02C (Gas-turbine plants) and F04D (Non-positive-displacement pumps) are secondary. Manufacturing and materials classes such as B23P, C23C, B23K, and B22F appear at lower but meaningful levels, indicating that process and surface engineering are adjacent rather than primary areas of patenting activity.
Two adjacent branches stand out as sparsely covered relative to their technical relevance: B33Y (Additive Manufacturing), with only 29 patent records despite the suitability of AM for complex blade-disk attachment geometries, and F16F (Springs and Vibration Dampers), with 31 records despite the critical role of under-platform dampers in managing fretting fatigue at the blade-disk interface. These are observations of relative sparsity; freedom-to-operate analysis against incumbent F01D5 claims would be a necessary next step before treating either as a confirmed entry opportunity.
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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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