GaN Substrates Patents: Who Leads, Where the Gaps Are 2026
- Concentrated at the top. five assignees hold 68.6% of all 417 records in scope, and the ranked leader alone accounts for 127 filings.
- Filings have flattened, not grown. activity peaked at 18 filings in 2019 and the 2022 midpoint sits at 10, with no sign of a renewed climb before the most recent, still-incomplete year.
- Claim density sits in two IPC subclasses. H01L and C30B cover 86.3% and 65.0% of records respectively, meaning most contested ground is semiconductor-device and crystal-growth claim language, not adjacent processing steps.
What this landscape covers
This dataset tracks patent filings addressing GaN substrate manufacture and bulk crystal growth — HVPE and ammonothermal growth routes, dislocation-density control, wafer bow and curvature, and cost-per-wafer claims — across records published between 2015 and mid-2026. The search combines title/abstract terms for free-standing GaN wafers with IPC classes covering crystal growth (C30B) and semiconductor devices (H01L), so it captures both the bulk-growth process claims and the device-adjacent substrate claims that sit on top of them.
Filing activity in this set is concentrated in a small number of assignees with long histories in GaN and SiC substrate manufacturing, rather than spread across a broad field of new entrants. Because publication typically lags filing by around 18 months, the most recent year of data understates true filing activity and should be read as a floor, not a ceiling.
Filing trend and technology composition
Two views of the same 417 records: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
A peak in 2019, then a plateau
Filings rose to a peak of 18 in 2019, eased toward a midpoint of 10 in 2022, and show no renewed upward trend through the most recent complete years — consistent with a field where the dominant growth routes are largely staked out rather than newly contested.
Claim density sits in device and crystal-growth classes
H01L (semiconductor devices) appears in 86.3% of the 417 records and C30B (crystal growth) in 65.0%, confirming that the core contested claim language covers both the growth process and the resulting device-ready substrate. Laser-related claims (H01S, 18.5%) and coating/deposition claims (C23C, 10.6%) are present but far thinner, and layered-product claims (B32B) and materials-analysis claims (G01N) each sit under 3% of records — signals of comparatively open ground at the edges of the core technology.
Shares are the percentage of the 417 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on GaN Substrates and Bulk Crystal Growth with Eureka
This page is one run against one query. Ask Eureka your own question about gan substrates and bulk crystal growth and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this space
Large area, uniformly low dislocation density GaN substrate and process for making the same (US20050103257A1)
Wolfspeed's filing claims large-area single-crystal III-V nitride material — gallium nitride exceeding 15 cm² with at least 1 mm thickness — held to an average dislocation density not exceeding 5E5 cm⁻² and a dislocation density standard deviation ratio under 25%. The process combines a first growth phase under pitted growth conditions, forming pits over at least 50% of the growth surface at a minimum pit density, with a subsequent phase that closes those pits to produce low-defect bulk material.Filed 2005-05-19; assigned to Wolfspeed, Inc.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20080261378A1 | Method for Growth of Gan Single Crystal, Method for Preparation of Gan Substrate, Process for Producing Gan-B… | 297 |
| 2 | US7303630B2 | Method of growing GaN crystal, method of producing single crystal GaN substrate, and single crystal GaN subst… | 293 |
| 3 | US20080308815A1 | GaN Substrate, Substrate with an Epitaxial Layer, Semiconductor Device, and GaN Substrate Manufacturing Method | 256 |
| 4 | US6468347B1 | Method of growing single crystal GaN, method of making single crystal GaN substrate and single crystal GaN su… | 228 |
| 5 | US20060213429A1 | Single crystal GaN substrate, method of growing single crystal GaN and method of producing single crystal GaN… | 218 |
| 6 | US6468882B2 | Method of producing a single crystal gallium nitride substrate and single crystal gallium nitride substrate | 206 |
| 7 | US20040262624A1 | GaN substrate and method of fabricating the same, nitride semiconductor device and method of fabricating the … | 196 |
| 8 | JP2002029897A | PRODUCTION PROCESS OF SINGLE CRYSTAL GaN SUBSTRATE AND SINGLE CRYSTAL GaN SUBSTRATE | 193 |
| 9 | US20050103257A1 | Large area, uniformly low dislocation density GaN substrate and process for making the same | 137 |
| 10 | US20050217565A1 | Method for epitaxial growth of a gallium nitride film separated from its substrate | 126 |
Ranked by citation count within this search; older foundational filings dominate because citation counts accumulate over time, not because they represent current filing priorities.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three patterns in this dataset matter more to a filing strategy than the raw counts alone.
The field has few gatekeepers
Five assignees combined account for 286 of the 417 records in scope, and the ranked leader alone holds 127. A new entrant is not filing into open ground at the top of the field — it is filing around, or licensing from, a small set of established crystal-growth specialists.
Growth has flattened, not accelerated
Filing volume peaked in 2019 and has since eased rather than climbed, with the leading assignees showing flat or negative year-on-year movement through the most recent tracked year. That is consistent with a technology where the core growth-process claims are largely staked, and new filings increasingly refine rather than pioneer.
Two subclasses carry almost all the density
Semiconductor-device claims (H01L) and crystal-growth claims (C30B) dominate the record set, while laminate (B32B) and materials-testing (G01N) claims sit under 3% each. That gap is where claim scope is thinnest relative to the core technology's importance.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to gan substrates and bulk crystal growth, with the prior art for and against each one.
Who holds the ground, and where the gaps sit
The ranked assignee list is dominated by long-established GaN and compound-semiconductor manufacturers rather than recent entrants, and momentum data shows even the leaders posting flat or declining filing activity in the most recent tracked year.
One assignee holds nearly a third of the top-5 total
The leading assignee's 127 records sit well ahead of fifth place at 17, indicating a filing history built over many years rather than a recent surge. Recent-year momentum data shows this assignee, along with several other leaders, at zero filings in the latest tracked year.
Collaboration is narrow but consistent
Only 10 co-assignee pairs appear across the dataset, with the strongest pairings each recorded at 11 shared filings. This points to a small number of durable technology-transfer or joint-development relationships among the established players rather than a broad collaborative ecosystem.
US and EPO dominate the filing map
The United States (166) and European Patent Office (85) are the two largest receiving offices, well ahead of Japan (49), China (40), Canada (18) and WIPO/PCT (17). That distribution reflects where GaN substrate manufacturing and downstream device markets are concentrated.
| Assignee | Recent year | YoY |
|---|---|---|
| Sumitomo Electric Industries, Ltd. | 0 | — |
| Mitsubishi Chemical Corporation | 0 | -100% |
| Wolfspeed, Inc. | 0 | — |
| Tohoku Techno Arch Co., Ltd. | 0 | — |
| Toyoda Gosei Co., Ltd. | 0 | — |
| NGK Insulators, Ltd. | 0 | — |
| EPIVALLEY Co., Ltd. | 0 | — |
| Sharp Corporation | 0 | — |
Turning this landscape into a filing or freedom-to-operate decision
The counts and rankings on this page describe where claim density already sits. Deciding where to file, or whether a specific process step is clear to practise, requires reading the underlying claims rather than the aggregate view.
Check freedom-to-operate on a specific growth step
If a project depends on a particular dislocation-density control or seed-preparation step, the aggregate charts here will not tell you whether it is blocked. Run the exact process language against the most-cited records and the leading assignees' active families.
Explore in EurekaTrack the leaders' next filings
Several top assignees show zero filings in the most recent tracked year, which may reflect either a pause or a publication lag rather than an exit. Set up ongoing monitoring on the ranked leaders to catch new families as they publish.
Explore in EurekaCommon questions about GaN substrate patents
The ranked list in this dataset covers 81 companies, and it is heavily concentrated: the top 5 assignees together hold 68.6% of all 417 records in scope, and the single leading assignee accounts for 127 records on its own. These are long-established compound-semiconductor and crystal-growth manufacturers with filing histories going back years, not recent entrants. A new player evaluating this space should expect to file around, or negotiate access to, a small set of dense existing claim clusters rather than open ground.
Filing activity peaked at 18 records in 2019 and had eased to a midpoint of 10 by 2022, with no renewed upward trend since. Because patent publication lags filing by roughly 18 months, the most recent year in the dataset is necessarily undercounted and should not be read as a real drop-off. Taken together, the pattern points to a field where the core process claims are largely staked and recent filings are refining existing positions rather than opening new ground.
Both routes are captured in this search's scope, but the claim density sits overwhelmingly in the crystal-growth (C30B, 65.0% of records) and semiconductor-device (H01L, 86.3% of records) IPC subclasses rather than being evenly split between the two growth methods. This dataset does not break out HVPE versus ammonothermal claim counts separately, so a practitioner comparing the two routes should read the underlying claim language of the most-cited records directly rather than relying on subclass shares alone.
This Wolfspeed filing claims large-area, low-dislocation-density single-crystal GaN material — over 15 cm² and at least 1 mm thick, held to a specific average dislocation density and a defined standard-deviation ratio — made via a two-phase pitted-growth process. It is one of the most-cited records in this dataset, meaning many later filings reference it as prior art. Anyone working on large-area, low-defect bulk GaN via a pitted-growth approach should read its claims in full rather than relying on the abstract, since its numeric thresholds define the boundary of what is already claimed.
Relative to the density in the two core IPC subclasses, several adjacent branches are thin: layered/laminate substrate composites (B32B, 2.2% of 417 records) and materials-analysis or in-line metrology claims (G01N, 1.2%) both sit well below the density seen in crystal-growth and device claims. Wafer bow-and-curvature control at larger diameters and cost-per-wafer process optimisation also appear in the search terms but do not show up as a dominant, separately dense subclass, suggesting claim language there is less crowded. These are starting points for a freedom-to-operate search, not a guarantee of clear ground.
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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.