GaN HEMT Trapping Patents: Who Leads, Where the Gaps Are 2026
- No single filer dominates. the leader holds 93 records and the top 5 combined account for only 5.1% of the 7,463 records in scope.
- Filing kept climbing through the last complete year, up 24% from 388 records in 2021 to 481 in 2024, before publication lag thins out 2025-2026.
- China dominates the filing venues, with 3,646 receiving-office filings against 1,367 in the United States and 757 at the EPO.
Filing growth compares 2021 (388 records) with 2024 (481) — 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 7,463 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks patent activity around dynamic on-resistance and charge trapping in GaN HEMTs — the recovery-time-constant measurements, surface-passivation schemes, virtual-gate modelling and qualification-test methods that separate a device datasheet number from what actually happens under hard switching. The search spans both trapping-specific claim language and the broader measurement-method and buffer-trapping vocabulary that surrounds it, which is why the IPC composition below pulls in metrology and data-processing classes as heavily as device physics.
7,463 records sit in scope from 2015 through the 2026-07-31 cut-off. Because publication trails filing by roughly 18 months, the 2025 and 2026 counts in the trend chart understate real activity and should be read as provisional, not as a slowdown.
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Filing trends and technology composition
Family counts, filing-year trend and IPC composition for the 7,463 records in scope, drawn directly from the underlying dataset.
Filing trend, 2017-2026
Annual filings rose from 416 in 2017 to a peak of 890 in 2025, with the 2021-2024 span alone up 24% (388 to 481). The 2026 figure of 152 reflects a partial year plus publication lag, not a drop in activity.
IPC subclass composition
Material analysis and testing (G01N, 14.8%) and dimensional measurement (G01B, 13.4%) lead the composition, ahead of digital data processing (G06F, 10.1%) and electric/magnetic measurement (G01R, 8.5%) — a profile that reflects how much of this field is characterisation and test methodology rather than device structure claims alone.
Shares are the percentage of the 7,463 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Dynamic On-Resistance and Trapping in GaN HEMTs with Eureka
This page is one run against one query. Ask Eureka your own question about dynamic on-resistance and trapping in gan hemts and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative filing
US20230375455A1 — Dynamic light scattering measurement method and dynamic light scattering measurement device
Provided are a dynamic light scattering measurement method and a dynamic light scattering measurement device with which a particle size distribution of each type of particle included in a dispersion liquid including particles is obtained. A dynamic light scattering measurement method for a dispersion liquid including a plurality of types of particles includes a measurement step of measuring a scattering intensity of the dispersion liquid a plurality of times to obtain a plurality of pieces of scattering intensity data while changing a value of any one of at least a scattering angle or a measurement wavelength among measurement parameters, a calculation step of calculating a plurality of piecFiled by Fujifilm Corporation, published 2023-11-23. Abstract truncated as supplied in the source record.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7621893B2 | Methods and apparatuses for detecting occlusions in an ambulatory infusion pump | 649 |
| 2 | US20040207836A1 | High dynamic range optical inspection system and method | 621 |
| 3 | US20020188723A1 | Dynamic frequency selection scheme for IEEE 802.11 WLANs | 614 |
| 4 | US6677258B2 | Breathable composite sheet structure and absorbent articles utilizing same | 589 |
| 5 | US20060020177A1 | Apparatus and method for measuring quantity of physical exercise using acceleration sensor | 526 |
| 6 | US20100191391A1 | multiobject fusion module for collision preparation system | 501 |
| 7 | US5170374A | Semiconductor memory | 333 |
| 8 | US20060184154A1 | Methods and apparatuses for detecting occlusions in an ambulatory infusion pump | 320 |
| 9 | US20110025629A1 | Dynamic Mode Switching for Fast Touch Response | 317 |
| 10 | US6605172B1 | Method of making a breathable and liquid impermeable web | 285 |
Citation counts favour older filings simply because they have had longer to accumulate them; treat this table as a signal of influence within the searched corpus, not a ranking of current technical importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers say
Three patterns stand out once the filing trend, assignee concentration and technology composition are read together.
No single assignee controls the field
The leader holds 93 records out of 7,463 in scope, and the top 5 combined reach only 5.1% of all records. Tenth place still holds 48. This is a fragmented field with a long tail of single- and few-filing entrants rather than one built around a handful of blocking portfolios.
Filing kept rising through the last complete year
Records grew from 388 in 2021 to 481 in 2024, a 24% increase over that span, with 2025 posting the highest raw count so far at 890. Because publication lags filing by about 18 months, the apparent tail-off in 2026 is an artefact of the data cut-off, not evidence that filing activity is cooling.
China is the dominant filing venue by a wide margin
China's receiving office recorded 3,646 filings against 1,367 in the United States, 757 at the EPO, 401 in Japan and 325 via WIPO/PCT. Any freedom-to-operate check on this technology needs a China-first search strategy, not a US-centric one.
Measurement and test methodology outweigh device-structure claims
G01N (material analysis and testing) and G01B (dimensional measurement) together cover more of the corpus than any device-physics class, with G06F and G01R close behind. That mix says the claim activity is concentrated on how trapping and dynamic Ron are measured and qualified, not solely on how the device itself is built.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to dynamic on-resistance and trapping in gan hemts, with the prior art for and against each one.
Who is filing, and how it clusters
The ranking covers 100 companies returned by the data endpoint, not a curated top tier. Reading it alongside the co-assignee pairs and recent-year momentum shows where activity is institutional versus academic, and where it is already cooling.
A modest lead, not a dominant one
The top-ranked assignee holds 93 records against a fifth-place figure of 65 and a tenth-place figure of 48 — a gentle slope rather than a cliff. That shape typically means licensing leverage is limited to specific claim families rather than the field as a whole.
Cross-entity filing is concentrated in a few pairs
Of 10 identified co-assignee pairs, one licensing-affiliate pair co-files far more heavily than the rest (66 records), while grid-research pairings in China co-file in the single digits. Co-assignee structures here look more like corporate affiliate filing than open industry consortia.
Recent-year academic filing is pulling back sharply
University assignees that were active in prior years show steep year-on-year declines in the latest year — several down 75% or more. Combined with the publication-lag effect, this looks more like a reporting gap than a genuine retreat from the technology, but it is worth revisiting once later filing years fully publish.
| Assignee | Recent year | YoY |
|---|---|---|
| Xi'an Jiaotong University | 2 | -75% |
| Beihang University | 2 | -80% |
| Southeast University | 2 | -75% |
| Dolby Laboratories Licensing Corporation | 1 | -50% |
| Dolby International AB | 1 | -67% |
| Zhejiang University | 1 | -91% |
| Canon Inc. | 0 | — |
| Toray Industries, Inc. | 0 | — |
Where to take this from here
The dataset points to a few concrete next steps depending on whether the goal is freedom-to-operate, licensing or R&D scoping.
Check China-first freedom-to-operate
With 3,646 of 7,463 records filed through China's receiving office, any clearance search that starts and ends with US and EPO filings will miss most of the field.
Run a freedom-to-operate search in Eureka →Watch the fragmented leaderboard for consolidation
A top 5 holding only 5.1% of records can shift quickly if one filer accelerates. Track the ranked leaders' quarterly filing rate rather than relying on a static snapshot.
Set up assignee monitoring in Eureka →Scope claims around the under-claimed branches
Virtual-gate compensation and in-situ recovery-time sensing show thinner filing density than core measurement-method claims, which may leave room for a first-mover claim.
Explore white space in Eureka →Common questions about this landscape
The leading assignee in this dataset holds 93 records out of 7,463 in scope, with the fifth-ranked assignee at 65 and the tenth at 48. That is a fragmented picture: the top 5 combined account for only 5.1% of all records, so no single company controls the claim space. A freedom-to-operate review should therefore check a broad set of mid-tier filers rather than assuming one or two portfolios dominate.
Yes, through the last complete filing year. Records rose from 388 in 2021 to 481 in 2024, a 24% increase, and the raw count peaked at 890 in 2025. The apparent drop in 2025-2026 figures is mostly a publication-lag artefact, since patent publications typically trail filing dates by around 18 months, so those most recent years should not be read as a genuine slowdown yet.
China's receiving office leads by a wide margin with 3,646 filings, followed by the United States at 1,367 and the European Patent Office at 757. Japan (401) and the WIPO PCT route (325) trail behind. Any competitive or clearance search limited to US and European filings would miss the majority of documented activity in this technology.
Measurement and testing classes dominate: G01N (material analysis and testing) covers 14.8% of the 7,463 records and G01B (dimensional measurement) covers 13.4%, ahead of digital-processing and electrical-measurement classes. Because a single record can carry several IPC codes, these shares add up to more than 100%, but the pattern still indicates that a large share of filing activity concerns how trapping and dynamic Ron are measured, characterised and qualified rather than novel device architectures alone.
Branches adjacent to the dense measurement-and-passivation core show lower filing density in this corpus, including virtual-gate compensation circuits, buffer-trap qualification protocols, in-situ recovery-time-constant sensing, and hard-switching loss attribution methods. These are not guaranteed gaps — they may simply be harder to claim distinctly — but they warrant a closer prior-art check before assuming the space is occupied the way core measurement-method claims already are.
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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.