Turbofan Erosion & Environmental Durability Patent Landscape
This field is dominated by a small group of established aerospace OEMs — General Electric, RTX, and Rolls-Royce together account for the majority of activity — with filing volume having eased back from its 2019 peak. The competitive structure is highly concentrated, with the top five filers holding a commanding share among the largest filers, leaving limited room for new entrants without differentiated coating or materials approaches.
General Electric leads a tightly held, OEM-dominated field
General Electric holds the top position in the applicant ranking with 281 patent records, well ahead of RTX Corp at 169 and United Technologies Corp at 124. Rolls-Royce PLC follows with 93 patent records, forming a clear first tier of four dominant incumbents.
The top five filers account for 69% of the combined total across the hundred largest filers, signaling a highly concentrated competitive structure. The gap between the first tier and the next group — Honeywell International at 41, IHI Corp at 27 — is substantial, pointing to a pronounced two-tier hierarchy.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | General Electric Company | 281 | |
| 2 | RTX Corporation | 169 | |
| 3 | United Technologies Corporation | 124 | |
| 4 | Rolls-Royce PLC | 93 | |
| 5 | Rolls-Royce Corporation | 45 | |
| 6 | Honeywell International Inc. | 41 | |
| 7 | IHI Corporation | 27 | |
| 8 | Rolls-Royce North American Technologies Inc. | 21 | |
| 9 | Rolls-Royce High Temperature Composites Inc. | 20 | |
| 10 | PRATT & WHITNEY CANADA CORP | 20 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Chromalloy Gas Turbine LLC | 17 | |
| 12 | Mitsubishi Electric Corporation | 12 | |
| 13 | Cannon-Muskegon Corporation | 12 | |
| 14 | GE Technology GmbH | 9 | |
| 15 | Oerlikon Surface Solutions AG | 8 | |
| 16 | Praxair Technology Inc. | 8 | |
| 17 | Massachusetts Institute of Technology | 7 | |
| 18 | Siemens AG | 7 | |
| 19 | Praxair Surface Technologies Inc. | 7 | |
| 20 | N.V. Interturbine | 6 |
The leaders’ positions reflect decades of vertically integrated investment in turbine blade metallurgy, thermal barrier coatings, and environmental protection systems. Challenging incumbents directly in core F01D and C23C technology branches would require significant foundational IP or a differentiated materials platform.
Filing counts for the most recent 18–24 months are subject to publication lag and are likely under-reported; trend readings for 2024–2025 should be treated as provisional. 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 eased; coatings and ceramics dominate the technology mix
The annual filing trend reveals a field that built rapidly to a 2019 peak before contracting, while the technology composition chart shows that turbine component engineering and surface coating deposition together account for the overwhelming majority of IPC classifications.
Annual filing trend
Annual filings climbed from 34 in 2017 to a peak of 79 in 2019, then declined to the 25–40 range through 2022 before softening further. Figures for 2024 and 2025 reflect publication lag and should not be read as a confirmed structural decline; the overall multi-year window still reflects a meaningful body of activity relative to the pre-2019 base.
↗ Hover for values · click a bar to ask EurekaTechnology composition
F01D (Turbines & non-positive engines) dominates the IPC mix with 828 records, followed by C23C (Coating & surface deposition) at 487 and F02C (Gas-turbine plants) at 230. C04B (Ceramics, cement & refractories) at 192 and C22C (Alloys) at 85 round out the core technical cluster, confirming that durability in this field is addressed primarily through protective coating chemistry and ceramic materials science.
↗ 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.
Environmental barrier coating with oxygen-scavengi…
A gas turbine engine article includes a substrate and an environmental barrier coating disposed on the substrate. The environmental barrier coating includes oxygen-scavenging particles. Each oxygen-scavenging particle includes a silicon-containing core particle encased in an oxygen barrier shell. (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Method for thermally spraying crack-free mullite c… | 558 |
| 2 | Microturbomachinery | 326 |
| 3 | Thermal/environmental barrier coating for silicon-… | 243 |
| 4 | Protective coating for thermal barrier coatings an… | 219 |
| 5 | Ceramic thermal barrier coating with alumina inter… | 218 |
| 6 | Erosion resistant surface protection | 204 |
| 7 | Repair of gas turbine engine component coated with… | 184 |
| 8 | High-temperature oxidation-resistant coating alloy | 180 |
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 patent structure means for R&D investment decisions
The combination of a maturing lifecycle, high concentration among aerospace OEMs, and active cross-entity collaboration within the Rolls-Royce group shapes where independent innovators can realistically compete or partner.
Field has moved past its peak filing year
The lifecycle stage is Decline, with annual filing volume easing back from the 2019 peak of 79 records. The field is not nascent — foundational coating and metallurgy IP is well established — meaning new entrants should expect to navigate dense prior art in core branches. Incremental improvements to existing thermal barrier or erosion-resistant coating architectures face a high freedom-to-operate burden.
Post-peak · 2019 apexTop five hold 69% of the largest-filer total
The top five filers among the hundred largest hold 69% of that group’s combined patent records, a level of concentration that indicates the core technological space is well staked out by incumbents. Smaller specialists such as Chromalloy Gas Turbine and Oerlikon Surface Solutions occupy narrow, differentiated niches — repair processes and PVD coatings respectively — which illustrates the viable entry model for non-OEMs.
High concentrationIHI and Mitsubishi Electric are the most active co-filers; Rolls-Royce co-files within its own group
The most active co-filing pair is IHI Corp and Mitsubishi Electric Corp with 23 joint records, concentrated in the C23C coating deposition space. Rolls-Royce PLC and Rolls-Royce High Temperature Composites Inc account for the next most active pairing at 14 records, reflecting intra-group technology integration. These collaboration patterns suggest that materials-science partnerships — particularly in coating process development — are the primary mechanism for capability sharing outside pure OEM R&D.
Intra-group + bilateralUS and EPO filings dominate; China is a thin but present jurisdiction
The United States leads with 374 patent records and Europe (EPO) follows with 302, together accounting for the majority of jurisdictional coverage. Canada at 60 and WIPO PCT at 47 reflect the international prosecution strategies of North American OEMs. China holds only 11 records, a markedly low figure for a jurisdiction of its aerospace manufacturing scale, which may indicate either a deliberate prosecution gap by incumbents or an emerging window for domestic Chinese filers.
US/EP 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 |
|---|---|---|
| IHI Corporation | Mitsubishi Electric Corporation | 23 |
| Rolls-Royce PLC | Rolls-Royce High Temperature Composites Inc. | 14 |
| Rolls-Royce Corporation | Rolls-Royce North American Technologies Inc. | 8 |
| Rolls-Royce Corporation | Rolls-Royce High Temperature Composites Inc. | 6 |
| Rolls-Royce PLC | Rolls-Royce Corporation | 4 |
| Rolls-Royce PLC | Rolls-Royce North American Technologies Inc. | 3 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
General Electric and RTX lead on volume; their technology emphases diverge at the coating layer
Both top players concentrate heavily in F01D turbine component IP, but General Electric extends more broadly into C23C multi-layer coating deposition while RTX Corp shows relatively stronger positioning in C04B ceramic refractories, signaling different material system bets for next-generation durability.
General Electric Co
General Electric leads the ranking with 281 patent records. Its technology focus clusters in F01D turbine components (233 records), C23C thermal spray coatings (85 records), and C23C multi-layer coating architectures (83 records), indicating a comprehensive systems approach from substrate to topcoat. Recent momentum is up 80% versus the prior period, bucking the broader field trend and suggesting continued active prosecution.
281 patent recordsRTX Corp
RTX Corp holds 169 patent records and shows a trajectory down 24% in recent filings versus the prior period, consistent with the field’s broader post-peak pattern. Its technology emphasis spans F01D turbine components (50 records), F01D nozzle and guide vane structures (24 records), and C04B ceramic refractories (21 records), suggesting a differentiated bet on ceramic matrix composite durability relative to GE’s coating-heavy strategy.
169 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| General Electric Company | 18 | ▲ +80% |
| Rolls-Royce PLC | 14 | ▼ -74% |
| RTX Corporation | 22 | ▼ -24% |
| Rolls-Royce Corporation | 5 | ▼ -58% |
| Honeywell International Inc. | 7 | ▲ new entrant |
| Rolls-Royce High Temperature Composites Inc. | 5 | ▼ -50% |
Under-served branches adjacent to the dominant coating and turbine core
Several IPC branches appear at lower relative share alongside the dominant F01D and C23C cluster. Two of these — ceramics for refractory applications and combustion chamber engineering — carry plausible technical value in the durability context and are noted here as observations of relative sparsity.
C04B · Ceramics, cement & refractories
C04B records number 192 but represent only 8% of the overall IPC distribution, making it one of the sparser branches relative to the dominant F01D and C23C clusters despite ceramics being central to environmental barrier coating (EBC) systems for silicon carbide composites. The most-cited patents in the corpus include EBC and thermal barrier ceramic references, confirming technical relevance. A focused entry path exists through novel rare-earth silicate EBC chemistries or processing routes not yet covered by incumbent filings from GE or RTX.
Search this in Eureka →F23R · Combustion chambers
F23R (Combustion chambers) records number 68 and carry only a 3% share of the IPC distribution, yet combustion liner erosion and hot-section environmental durability are direct engineering challenges in modern turbofan development. The low count relative to the overall field size suggests that liner-specific protective coating solutions — particularly for additive-manufactured combustor walls — remain comparatively under-addressed. Entry through metal additive manufacturing combined with in-situ coating processes (B33Y has only 3 records) represents a plausible and technically grounded niche.
Search this in Eureka →How leading applicants differ by technology route
Route coverage across the main technology branches in the current evidence set.
| Player | F01D 5 · Turbines & non-positive engines | C23C 4 · Coating & surface deposition | C23C 28 · Coating & surface deposition | F02C 7 · Gas-turbine plants | F01D 25 · Turbines & non-positive engines |
|---|---|---|---|---|---|
| General Electric Company | Strong · 233 | Moderate · 85 | Moderate · 83 | Moderate · 64 | Moderate · 64 |
| United Technologies Corporation | Strong · 160 | Strong · 100 | Moderate · 48 | Moderate · 61 | Moderate · 57 |
| Rolls-Royce PLC | Strong · 80 | Emerging · 7 | Absent | Moderate · 21 | Emerging · 15 |
| RTX Corporation | Strong · 50 | Emerging · 9 | Emerging · 9 | Emerging · 8 | Moderate · 15 |
| Honeywell International Inc. | Strong · 36 | Absent | Moderate · 16 | Absent | Absent |
| Chromalloy Gas Turbine LLC | Strong · 17 | Absent | Strong · 16 | Strong · 17 | Absent |
| IHI Corporation | Strong · 26 | Moderate · 6 | Absent | Strong · 15 | Absent |
Frequently asked questions
The landscape covers 322 patent families focused on turbofan erosion resistance and environmental durability.
General Electric Co leads with 281 patent records, ahead of RTX Corp at 169 and United Technologies Corp at 124. These three form a clear first tier separated from the rest of the field.
Annual filing volume peaked at 79 records in 2019 and has eased back since, with recent years showing lower counts. The most recent 18–24 months are subject to publication lag and should be treated as provisional, but the field’s lifecycle stage is assessed as post-peak.
F01D (Turbines & non-positive engines) leads with 828 records, followed by C23C (Coating & surface deposition) at 487 and F02C (Gas-turbine plants) at 230. C04B ceramics and C22C alloys are the next most populated branches.
The United States leads with 374 records and Europe (EPO) follows with 302. Canada, WIPO PCT, and Japan are the next most active jurisdictions. China holds only 11 records, a comparatively low presence for a major aerospace manufacturing jurisdiction.
IHI Corp and Mitsubishi Electric Corp are the most active co-filing pair with 23 joint records, primarily in coating deposition. Within the Rolls-Royce group, Rolls-Royce PLC and Rolls-Royce High Temperature Composites Inc have filed jointly on 14 occasions.
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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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