AlN Ceramic Patents: Who Leads, Where the Gaps Are 2026
- Filing has plateaued, not accelerated. Volumes peaked at 29 families in 2024 after a flat run through the 2022 midpoint of 19 — this is a maturing claim space, not a land grab.
- China dominates the filing venue. 223 of the tracked records were filed in China versus 98 in Japan and 59 in the US, meaning much of the newest claim activity sits outside the classic AlN patent holders.
- The founding patents still carry the citation weight. The five most-cited records date from 1984-1998, and the underlying substrate and sintering chemistry they established is what any new filing has to design around.
What this landscape covers
This dataset tracks 471 patent families filed between 2015 and 2026 (data cut-off 2026-07-31) across the search space of aluminum nitride ceramics, high-thermal-conductivity ceramic substrates, and adjacent power-module metallization claims. The IPC spread is heavily weighted to C04B (ceramics, cement and refractories, 410 records) with a substantial secondary cluster in H01L semiconductor devices (117), confirming that most of the recent filing activity is substrate and packaging chemistry rather than novel device architecture.
Because publication typically lags filing by around 18 months, the 2025-2026 counts in the trend chart understate real filing activity for those years. Treat the most recent one to two years as a floor, not a ceiling.
Filing trend and technology composition
Two views of the same 471-family dataset: how filing volume has moved year over year, and how the underlying IPC codes split across ceramics, semiconductor packaging and coating disciplines.
Filing trend, 2017-2026
Filings rose from 18 in 2017 to a peak of 29 in 2024, with the 2022 midpoint sitting at 19 — a pattern consistent with steady, incremental filing rather than a sharp technology inflection. The 2026 figure of 5 is a partial year and should not be read as a decline.
IPC subclass composition
C04B (410 records) and H01L (117) together account for the bulk of the corpus, with H10W (65), H05K (62) and smaller clusters in C23C, B32B, B28B and C01B marking out coating, lamination, shaping and elemental-inorganic sub-branches that see comparatively little filing traffic.
Shares are the percentage of the 471 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Aluminum Nitride and High-Thermal-Conductivity Ceramics with Eureka
This page is one run against one query. Ask Eureka your own question about aluminum nitride and high-thermal-conductivity ceramics and every answer comes back with the patent numbers behind it.
Try EurekaThe patents anchoring this space
US5773377A — Low temperature sintered, resistive aluminum nitride ceramics
An aluminum nitride ceramic having enhanced properties suitable for electronic packaging applications can be prepared from a synergistic aluminum nitride powder/sintering aid mixture, in which the sintering aid is formulated to provide a resultant desirable second phase within the sintered body. The aluminum nitride powder/sintering aid mixture can be formed into green sheet-metal laminates and sintered at low temperature to yield high density, high electrical resistivity, and high thermal conductivity metal ceramic sintered bodies with low camber.Filed by CMC Interconnect Technologies, granted 1998-06-30.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5506755A | Multi-layer substrate | 109 |
| 2 | US5155661A | Aluminum nitride multi-chip module | 82 |
| 3 | US4478785A | Process of pressureless sintering to produce dense, high thermal conductivity aluminum nitride ceramic body | 75 |
| 4 | US4840853A | Surface structure of AlN substrate and a process for producing the same | 73 |
| 5 | US4659611A | Circuit substrate having high thermal conductivity | 68 |
| 6 | US4611745A | Method for preparing highly heat-conductive substrate and copper wiring sheet usable in the same | 64 |
| 7 | US4547471A | High thermal conductivity aluminum nitride ceramic body | 59 |
| 8 | US4924033A | Brazing paste for bonding metal and ceramic | 55 |
| 9 | CN108033810A | 一种氮化铝陶瓷覆铜板的制备方法 | 54 |
| 10 | US8120153B1 | High-temperature, wirebondless, injection-molded, ultra-compact hybrid power module | 51 |
Citation counts inside a searched corpus favour older filings; read this table as a map of foundational influence, not of present-day competitive relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Read together, the trend line, the venue split and the citation table point to a technology that is well-occupied at its core but still has room at its edges.
Growth has flattened, not stopped
Filings went from 18 in 2017 to a 2022 midpoint of 19 to a peak of 29 in 2024. That is roughly a decade of incremental growth rather than a breakout — new entrants are refining known chemistry, not opening a new category.
The venue centre of gravity has shifted
China now accounts for nearly half of tracked filings, well ahead of Japan and the United States. Any freedom-to-operate check for a Chinese-market product needs to weight the local filer set as heavily as the legacy US/Japan portfolios.
Foundational claims are decades old
The most-cited record, US5506755A, and its peers date from 1984 to 1998. Their substrate and sintering-aid claims still frame what counts as novel in later filings, so prior-art searches should not stop at the last ten years.
Collaboration is rare and narrow
Only six co-assignee pairs appear in the dataset, and the strongest link involves 11 shared families between two organizations. Most filers in this space patent alone rather than through joint ventures.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to aluminum nitride and high-thermal-conductivity ceramics, with the prior art for and against each one.
Who is filing, and where the field is open
Recent-year momentum is muted across the named assignees tracked here, with several long-standing filers showing zero filings in the latest year and one showing a sharp year-over-year drop — a signal that this technology has moved from active buildout into maintenance mode for its historical leaders.
Even active filers are pulling back
Fujian Huaqing Electronic Materials Technology recorded just 1 filing in the latest year, down 67% year over year — the only assignee in the momentum table still filing at all in the most recent period.
Historical leaders have gone quiet
General Electric, Toshiba, Sumitomo Electric Industries, NGK Insulators and Norton (Saint-Gobain) all show zero filings in the latest tracked year, consistent with a portfolio being defended rather than expanded.
The densest partnership is a legacy one
The strongest co-assignee relationship in the dataset — Norton and IBM, with 11 shared families — reflects an earlier era of joint substrate development rather than an active current alliance.
| Assignee | Recent year | YoY |
|---|---|---|
| Fujian Huaqing Electronic Materials Technology Co., Ltd. | 1 | -67% |
| General Electric Company | 0 | — |
| Toshiba Corporation | 0 | — |
| Sumitomo Electric Industries, Ltd. | 0 | — |
| NGK Insulators, Ltd. | 0 | — |
| Norton Company | 0 | — |
| International Business Machines Corporation (IBM) | 0 | — |
| Junci Electronic Materials (Hebei) Co., Ltd. | 0 | -100% |
Where to take this from here
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, sourcing, or new claim drafting.
Check the founding patents before drafting
The 1984-1998 citation leaders still define the baseline for novelty in sintering aid and substrate claims. Any new filing should map against these before assuming a gap exists.
Explore prior art with EurekaWeight China in any FTO search
With 223 of the tracked filings routed through China, a freedom-to-operate review built only on US and Japanese portfolios will miss nearly half the active claim landscape.
Run a jurisdiction-aware searchTest the under-claimed branches
Coating, lamination and shaping sub-areas carry a fraction of the filings seen in core ceramics and semiconductor packaging classes, and may offer more open claim space.
Map white space in EurekaCommon questions about this landscape
The most-cited records in this corpus date from 1984 to 1998, led by filings such as US5506755A, US5155661A, US4478785A, US4840853A and US4659611A. These establish core claims around multi-layer substrate structures, pressureless sintering to achieve dense high-thermal-conductivity AlN bodies, and surface metallization processes. Any new entrant's freedom-to-operate analysis should start with these, since their citation counts (up to 109) indicate they are still the reference point examiners and competitors cite against.
Filing volume in this dataset rose from 18 families in 2017 to a peak of 29 in 2024, with the 2022 midpoint at 19 — a pattern of slow, steady growth rather than acceleration. The 2026 figure is partial due to publication lag, typically around 18 months, so it should not be read as a drop-off. Overall the trend looks like a maturing field being refined incrementally rather than one being reinvented.
China leads with 223 of the tracked filings, roughly double Japan's 98 and nearly four times the United States' 59. Europe (EPO), Canada and the United Kingdom each show smaller counts in the teens. This distribution means a China-focused sourcing or FTO strategy needs its own dedicated search rather than relying on legacy US/Japan portfolio reviews.
US5773377A, assigned to CMC Interconnect Technologies and granted in 1998, claims a low-temperature sintered aluminum nitride ceramic made from a specific AlN powder and sintering-aid mixture formulated to produce a targeted second phase in the sintered body. It covers the resulting high-density, high-electrical-resistivity, high-thermal-conductivity ceramic with low camber, formed via green sheet-metal laminates. Anyone working on low-temperature sintering routes with comparable sintering-aid chemistry should review its claim scope closely, though it is one of many sintering-aid patents in the corpus, not the only one.
IPC subclasses like C23C (coating and surface deposition, 17 records), B32B (layered laminates, 15), B28B (shaping, 11) and C01B (non-metallic elemental inorganics, 11) show far fewer filings than the dominant C04B and H01L classes. This does not mean these branches are technically easier, but the claim space is less occupied. Combined with the low rate of co-assignee collaboration across the dataset (only 6 pairs), there appears to be room for both solo filers and new joint development claims in these adjacent areas.
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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.