Metal Matrix Composites Patents: Leaders & Filing Trends 2026
- Filings have flattened since 2017. The peak year so far was 2017 at 15 records in this search, with 2022 at 12 — a plateau, not a climb, even before the recent-year undercount from publication lag.
- Alloy and casting IPC classes dominate. C22C (673 records) and B22D (393) carry most of the claim density, with C04B ceramics and B22F powder metallurgy close behind — coating (C23C, 49) and conductor applications (H01B, 43) are comparatively thin.
- The most-cited patent is decades old. US4828008A leads citations at 175, ahead of newer additive-manufacturing and wire/cable patents — a sign the foundational claim space was staked out early and citation counts still favour those originals.
Filing growth compares 2021 (5 records) with 2024 (10) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 718 records in scope (CR5), not by the ranked leaders only.
What the metal matrix composite patent record shows
Metal matrix composites combine a metallic matrix with a reinforcing phase — particles, whiskers or fibres — to gain stiffness, wear resistance or thermal conductivity that the base metal alone cannot deliver. The 718 families captured here span stir casting, reinforcement distribution, and wettability control, alongside downstream applications in wire, cable and thermally conductive substrates. The classification spread is telling: this is fundamentally an alloys-and-casting field (C22C, B22D) with ceramics (C04B) and powder metallurgy (B22F) as major supporting branches, rather than a coatings or electronics-first technology.
Filing activity peaked in 2017 and has not returned to that level since, with the 2022 midpoint sitting below peak. Because publication typically lags filing by around eighteen months, the most recent years in any such trend will always look thinner than they eventually turn out to be — but the multi-year plateau visible here predates that effect and points to a maturing rather than accelerating filing environment.
Filing trends and technology composition
718 patent families were pulled from receiving offices led by the United States, Europe and Japan, spanning IPC classes from bulk alloy chemistry through to powder metallurgy and surface coating.
A plateau since the 2017 peak
From 15 filings in 2017 to 12 at the 2022 midpoint and down to 2 in the most recent (partial) year, the trend line describes flat-to-declining activity rather than sustained growth — treat the final year or two as undercounted due to publication lag rather than a genuine drop-off.
Claim density concentrated in alloys and casting
C22C (673 records) and B22D (393) account for the bulk of filings, with C04B ceramics (330) and B22F powder metallurgy (324) close behind. Coating (C23C, 49), conductor applications (H01B, 43), laminates (B32B, 30) and extrusion (B21C, 25) are comparatively lightly claimed, marking them as narrower but potentially more open branches.
Shares are the percentage of the 718 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Metal Matrix Composites with Eureka
This page is one run against one query. Ask Eureka your own question about metal matrix composites and every answer comes back with the patent numbers behind it.
Try EurekaThe patents everyone else cites
Method for making high thermal conductivity metal matrix composite (US8066937B2)
The patent covers discontinuous diamond particulate metal matrix composites engineered for high thermal conductivity. Its method builds a thin, reaction-formed, diffusion-bonded functionally graded SiC surface layer on diamond particles before infiltrating the coated particles with metal under pressure. The interactive SiC coating is designed to minimise interface thermal resistance between diamond and matrix, which is the mechanism the claims rely on to deliver both thermal performance and mechanical strength.Filed by Nano Materials International Corporation, granted 2011-11-29.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4828008A | Metal matrix composites | 175 |
| 2 | US20160175929A1 | Process for additive manufacturing of parts by melting or sintering particles of powder(s) using a high-energ… | 151 |
| 3 | US6344270B1 | Metal matrix composite wires, cables, and method | 143 |
| 4 | US6329056B1 | Metal matrix composite wires, cables, and method | 138 |
| 5 | US6485796B1 | Method of making metal matrix composites | 130 |
| 6 | US4376803A | Carbon-reinforced metal-matrix composites | 124 |
| 7 | US4134759A | Light metal matrix composite materials reinforced with silicon carbide fibers | 112 |
| 8 | US4082864A | Reinforced metal matrix composite | 97 |
| 9 | US5010945A | Investment casting technique for the formation of metal matrix composite bodies and products produced thereby | 96 |
| 10 | US6723451B1 | Aluminum matrix composite wires, cables, and method | 78 |
Citation counts favour older records simply because they have had longer to accumulate references within this searched corpus — read them as a map of influence on later filers, not as a ranking of current technical relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once family counts, citation weight and IPC spread are read together.
Growth has stalled, not accelerated
The 2017 peak of 15 filings has not been matched since, and the 2022 midpoint of 12 confirms a plateau rather than a dip. Even allowing for publication lag understating the last year or two, this is not a field in an expansion phase.
Alloy chemistry dwarfs coating claims
C22C alloys and B22D casting together account for the large majority of records, while C23C coating and H01B conductor applications sit an order of magnitude lower. That imbalance is where narrower, less-contested claim space is likely to sit.
Foundational claims still anchor the field
The most-cited patent predates the additive-manufacturing and wire/cable patents that follow it in the ranking, showing that early, broad matrix-composite claims remain the reference point later filers build against.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to metal matrix composites, with the prior art for and against each one.
Who holds the ground, and how it's shared
Co-assignee pairs are limited — ten pairs recorded in total — and the strongest links point to consolidated corporate structures rather than open collaboration.
Filing pairs mostly reflect corporate structure
The strongest co-assignee link, at 16 shared families, connects two entities under the same corporate umbrella rather than an external partnership, as does the second-strongest pair between two Toyota entities at 13.
Historical leaders have gone quiet recently
None of the assignees with the strongest historical filing records show activity in the latest year of this dataset, consistent with the broader plateau in the filing trend — though recent-year figures are the most exposed to publication lag.
Filing is concentrated in three jurisdictions
The United States, European Patent Office and Japan together account for the bulk of receiving-office activity, with Canada, Finland and Australia trailing well behind — a useful check when deciding where freedom-to-operate work matters most.
| Assignee | Recent year | YoY |
|---|---|---|
| Lanxide Technology Company | 0 | — |
| 3M Innovative Properties Company | 0 | — |
| Toyota Motor Corporation | 0 | — |
| Lanxide Corporation | 0 | — |
| Toyota Motor Corporation | 0 | — |
| Imperial Chemical Industries (ICI) | 0 | — |
| Honeywell International Inc. | 0 | — |
| TECHNICAL CERAMICS LABORATORIES INC | 0 | — |
Where to take this analysis
The dataset points to specific questions worth running down before committing R&D or filing budget.
Check freedom-to-operate against the top-cited foundational patents
US4828008A and the wire/cable patents that follow it carry the most citation weight in this corpus. Any new filing touching bulk matrix composition or wire/cable metal matrix composite structures should be checked against these first.
Run a claims comparison in EurekaMap the thinly-claimed branches against your own roadmap
Coating, conductor and laminate applications of metal matrix composites show materially lower IPC density than the alloy-and-casting core. That gap is either unclaimed opportunity or unclaimed risk, depending on which side of it you sit.
Explore white space in EurekaWatch for renewed filing activity as publication lag clears
The apparent drop-off in the last year or two of this trend is partly a reporting artefact. Re-run the trend view in six to twelve months to see whether the plateau holds once late-published families land.
Track filing trends in EurekaCommon questions on metal matrix composite patents
The dataset shows filing activity concentrated among a small group of long-established assignees, with corporate-affiliated co-filing pairs rather than open cross-company collaboration. None of the historically strongest filers show activity in the most recent year captured, which is consistent with the broader plateau in filings since 2017. For a current competitive picture, cross-reference the assignee ranking against each company's public R&D announcements, since patent counts alone lag actual commercial activity.
Filings peaked at 15 in 2017 and have not returned to that level, with the 2022 midpoint at 12 and a sharp apparent drop toward the most recent year. Part of that recent decline is a reporting artefact: publication typically lags filing by around eighteen months, so the last one to two years in any patent trend understate true activity. Even accounting for that lag, though, the multi-year plateau suggests the core claim space in alloy and casting chemistry is well occupied rather than actively expanding.
C22C, the alloys classification, covers the large majority of records in this dataset at 673 of 718 families, followed by B22D metal casting at 393. C04B ceramics and B22F powder metallurgy are substantial secondary categories, while coating, conductor, laminate and extrusion applications are comparatively minor. This distribution indicates the field is anchored in bulk alloy and casting process claims rather than surface treatment or application-specific engineering.
US8066937B2, assigned to Nano Materials International Corporation and granted in 2011, claims a method for producing high thermal conductivity metal matrix composites using diamond particulate reinforcement. The core mechanism is a thin, reaction-formed SiC surface layer on the diamond particles that reduces interface thermal resistance with the metal matrix during infiltration. Anyone developing diamond-reinforced or similarly graded-interface thermal composites should review this filing's specific claim scope before finalising a process route, since it targets the interface engineering step rather than the base alloy composition.
The IPC distribution points to coating and surface deposition (C23C, 49 records), conductor applications (H01B, 43), layered structures (B32B, 30) and extrusion processes (B21C, 25) as the most thinly claimed branches relative to the dominant alloy and casting core. These are not necessarily easy to enter — some overlap with well-cited foundational patents — but the density of prior art is measurably lower than in bulk C22C alloy chemistry. Confirming genuine freedom to operate in any of these branches still requires a targeted claims search rather than relying on aggregate IPC counts alone.
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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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.