HEA Grain-Boundary & Coating Interface Patent Landscape
The HEA grain-boundary and coating-interface space is in a confirmed growth stage, with annual filings rising sharply since 2021 and the corpus dominated by Chinese academic institutions filing under domestic jurisdiction. Activity is fragmented at the top — the five largest filers hold only 14% of the hundred largest filers’ combined total — leaving meaningful room for focused challengers, particularly in coating deposition and additive-manufacturing routes.
Chinese universities lead a fragmented but fast-growing field
Central South University and Kunming University of Science and Technology jointly top the applicant ranking, each with 6 patent families, followed closely by Shanghai Jiao Tong University, Xi’an University of Technology, and Nanjing University of Science and Technology at 5 each. No single institution commands an outsized share, confirming a structurally competitive field.
The top five filers account for just 14% of the hundred largest filers’ combined total, signalling low concentration. The gap between the first-ranked group and the broader mid-tier is narrow, meaning positional advantage can shift with a sustained two- to three-year filing campaign.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Central South University | 6 | |
| 2 | KUNMING UNIV OF SCI & TECH | 6 | |
| 3 | Shanghai Jiao Tong University | 5 | |
| 4 | Xi’an University of Technology | 5 | |
| 5 | NANJING UNIV OF SCI & TECH | 5 | |
| 6 | Xi’an Technological University | 4 | |
| 7 | Soochow University | 4 | |
| 8 | THE IND & ACADEMIC COOP IN CHUNGNAM NAT UNIV (IAC) | 4 | |
| 9 | Beijing Institute of Technology | 4 | |
| 10 | Elmet Technologies LLC | 4 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | AVIC Beijing Institute of Aeronautical Materials | 4 | |
| 12 | PRATT & WHITNEY CANADA CORP | 4 | |
| 13 | Concordia University | 4 | |
| 14 | Institute of Metal Research, Chinese Academy of Sciences | 4 | |
| 15 | Yanbo Additive Manufacturing (Xuzhou) Technology Co., Ltd. | 3 | |
| 16 | Nanjing Tech University | 3 | |
| 17 | Xi’an Jiaotong University | 3 | |
| 18 | Harbin Institute of Technology | 3 | |
| 19 | South China University of Technology | 3 | |
| 20 | RTX Corporation | 3 |
The dominance of university applicants — rather than vertically integrated manufacturers — suggests the technology remains largely in the translational research phase. Industrial actors such as Elmet Technologies, Pratt & Whitney Canada, and RTX Corp are present but not yet at scale, indicating commercial exploitation of grain-boundary and interface IP is still emerging.
Filing data for 2025 and 2026 are subject to publication lag and understate actual activity; conclusions on near-term momentum should be drawn from the 2021–2024 window. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Accelerating filings and alloy-composition dominance with growing coating activity
Two charts capture the field’s dynamics: a filing trend that shows sharp acceleration from 2021 onward, and a technology-branch breakdown that reveals alloy composition as the anchor class while coating and additive-manufacturing branches are pulling forward.
Annual filing trend
Annual filings roughly doubled from the 2017–2020 baseline to the 2021–2023 window, then accelerated again into 2024. The 2025–2026 bars are understated by publication lag and should not be read as a slowdown; underlying growth-stage dynamics remain intact.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C22C (Alloys) is the dominant branch, reflecting the compositional-design emphasis in HEA research. B22F (Powder metallurgy) and C23C (Coating and surface deposition) are the next largest branches, confirming that processing routes for interface engineering — sintering, thermal spray, cold spray — are an established second tier. B33Y (Additive manufacturing) and C22F (Non-ferrous metal treatment) form a smaller but notable third tier, pointing to emerging process diversification.
↗ 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.
High entropy alloy-based composites as temperature…
A high entropy alloy composite conductor(100). The high entropy alloy composite conductor (100) has an electric resistivity at room temperature of less than 200 μΩ • cm as measured by the norm ASTM B0193-20, the high entropy alloy composite conductor (100) has a temperature coefficient of resistivity (TCR) of less than 4000 ppm/K as measured by the norm… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | High entropy alloy having TWIP/trip property and m… | 66 |
| 2 | Multi component solid solution high-entropy alloys | 54 |
| 3 | 一种粉末冶金高熵合金基复合材料的制备方法 | 46 |
| 4 | High-entropy alloy, and method for producing the s… | 42 |
| 5 | 一种高性能金属基复合材料的制备方法 | 38 |
| 6 | High entropy alloy having TWIP/TRIP property and m… | 34 |
| 7 | High entropy alloy having composite microstructure | 32 |
| 8 | 一种高硬体心立方相增强韧塑面心立方结构的高熵合金复合材料及其制备方法 | 31 |
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 signals — maturity stage, concentration level, collaboration networks, and geographic reach — together frame where the field is open and where incumbents have dug in.
Growth stage: early acceleration, not yet plateau
The lifecycle evidence places this field firmly in the Growth stage, with annual filings still rising and the most recent years understated by publication lag. The 100% recent-window growth figure confirms the pace of expansion. Researchers entering now face an active but not yet crowded prior-art landscape, particularly outside the dominant alloy-composition IPC class.
Growth stageLow concentration — positional advantage is contestable
With the top five filers capturing only 14% of the hundred largest filers’ combined total and no single applicant exceeding 6 patent families, the field lacks an entrenched leader. The narrow tier gap means a focused institution or company filing 8–10 families in a targeted sub-route — such as coating-interface adhesion or grain-boundary segregation control — could reach the top rank within a single filing cycle.
FragmentedA tight Canada–North America cluster stands out amid otherwise isolated filers
The most active co-filing network involves McGill University, Pratt & Whitney Canada, and Concordia University, each sharing 4 co-filed families, forming a coherent aerospace-coating triangle. Central South University co-filed once with Zhongke Powder Research (Henan), the only notable China-industry linkage in the evidence. The broader field shows sparse collaboration, suggesting most institutions are competing independently rather than building open innovation ecosystems.
Sparse collaborationChina-dominant filing with thin Western protective coverage
China accounts for 169 patent records, the United States for 28, Europe (EPO) for 5, and WIPO (PCT) for 4. This distribution means most HEA grain-boundary IP is protected only in China, leaving Western markets — particularly aerospace, tooling, and energy applications — with limited prior-art barriers. Applicants seeking commercial freedom to operate or defensive position in the US and European markets face a relatively sparse landscape.
China-dominantGo 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 |
|---|---|---|
| McGill University | Pratt & Whitney Canada Corp. | 4 |
| McGill University | Concordia University | 4 |
| Pratt & Whitney Canada Corp. | Concordia University | 4 |
| Central South University | Zhongke Powder Research (Henan) Superhard Materials Co., Ltd. | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
University-led incumbents versus a focused aerospace coalition
The leaderboard splits into two clusters: Chinese universities anchored in alloy-composition and powder-metallurgy routes, and a Canadian aerospace coalition (McGill, Pratt & Whitney Canada, Concordia) concentrating on coating and surface-deposition routes.
Central South University
Central South University holds 6 patent families, the joint highest in the ranking, with technology emphasis concentrated in C22C 30 (alloy composition), B22F 1, and B22F 3 (powder metallurgy routes). Applicant momentum is classified as a new entrant in the recent filing window, indicating its current position has been built very recently and its trajectory should be watched closely as it consolidates.
6 patent familiesMcGill University
McGill University holds 4 patent families and is the lead node in the most active co-filing network in the corpus, partnering with Pratt & Whitney Canada and Concordia University on coating and surface-deposition work (C23C 4 and C23C 24). Its momentum is classified as a new entrant in the recent window, and its aerospace-facing coating focus differentiates it sharply from the Chinese alloy-composition mainstream — making it the most industrially relevant non-Chinese actor in the ranking.
4 patent families| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Kunming University of Science and Technology | 1 | ▲ new entrant |
| Central South University | 1 | ▲ new entrant |
| Nanjing University of Science and Technology | 1 | ▲ new entrant |
| Shanghai Jiao Tong University | 5 | ▲ new entrant |
| McGill University | 4 | ▲ new entrant |
| Pratt & Whitney Canada Corp. | 4 | ▲ new entrant |
Under-served routes adjacent to the HEA grain-boundary mainstream
Several IPC branches adjacent to the dominant alloy-composition class carry low patent counts relative to their technical relevance; two stand out as worth monitoring for potential entry or collaboration.
B23K · Welding, soldering and brazing
With only 18 patent records, welding and brazing routes for joining HEA components — where grain-boundary behavior at the fusion zone is critical — remain sparsely covered. Technical value is real: HEA weld interfaces are prone to segregation and phase instability that degrade mechanical performance in aerospace and tooling applications. An entrant combining HEA alloy design expertise with joining-process know-how faces limited prior-art friction in this branch.
Search this in Eureka →B33Y · Additive manufacturing (3D printing)
Additive manufacturing accounts for 34 patent records — only 6% of the branch distribution — despite being one of the most industrially active processing routes for complex HEA geometries where layer-by-layer grain-boundary evolution and coating adhesion are active research problems. Entry paths exist through feedstock powder design (linking to B22F) or in-situ process monitoring for interface quality. The branch is sparse relative to technical activity in the literature, suggesting IP has not kept pace with laboratory advances.
Search this in Eureka →How leaders diverge across alloy-design, powder, and coating routes
Route coverage across the main technology branches in the current evidence set.
| Player | C22C 30 · Alloys | C22C 1 · Alloys | B22F 9 · Powder metallurgy | B22F 1 · Powder metallurgy | B22F 3 · Powder metallurgy |
|---|---|---|---|---|---|
| Central South University | Strong · 6 | Moderate · 2 | Moderate · 2 | Moderate · 2 | Moderate · 2 |
| Nanjing University of Science and Technology | Strong · 5 | Strong · 4 | Absent | Absent | Absent |
| AVIC Beijing Institute of Aeronautical Materials | Strong · 4 | Absent | Moderate · 2 | Strong · 3 | Absent |
| Taiyuan University of Technology | Absent | Strong · 3 | Strong · 3 | Absent | Strong · 2 |
| Xi’an University of Technology | Strong · 5 | Absent | Absent | Absent | Moderate · 2 |
| Institute of Metal Research, Chinese Academy of Sciences | Strong · 4 | Strong · 3 | Absent | Absent | Absent |
| Soochow University | Strong · 4 | Absent | Strong · 3 | Absent | Absent |
Frequently asked questions
The evidence covers 208 patent families in scope globally, with the majority filed in China (169 patent records) and a secondary cluster in the United States (28 patent records).
Central South University and Kunming University of Science and Technology jointly lead with 6 patent families each, followed by Shanghai Jiao Tong University, Xi’an University of Technology, and Nanjing University of Science and Technology at 5 each. Industrial filers such as Elmet Technologies, Pratt & Whitney Canada, and RTX Corp each hold 4 patent families.
The field is structurally fragmented. The top five filers account for only 14% of the hundred largest filers’ combined total, and no applicant exceeds 6 patent families. A focused filing program in a targeted sub-route could reach the top of the ranking relatively quickly.
The evidence places the field in a confirmed Growth stage, with annual filings still rising and a 100% growth rate in the recent window. The most recent years (2025–2026) are understated by publication lag and do not represent a slowdown.
C22C (Alloys) dominates, followed by B22F (Powder metallurgy) and C23C (Coating and surface deposition). The most notable under-served adjacent branches are B23K (Welding and brazing) with 18 patent records and B33Y (Additive manufacturing) with 34 patent records — both low relative to their technical significance in HEA processing.
The most active co-filing network links McGill University, Pratt & Whitney Canada, and Concordia University, each sharing 4 co-filed families on coating and surface-deposition work. Beyond this aerospace cluster, collaboration is sparse — most institutions file independently.
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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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