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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/ferrite-materials-for-power-conversion-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Functional MaterialsFerrite Materials for Power Conversion: Patents, Leaders and Filing Trends
- Filings rose 50% from 2021 to 2024, the last year with complete publication data, with 2024 marking the peak filing year so far at 3 records.
- Ceramics classification (C04B) touches 92.3% of the 13 records in scope, while magnetics classification (H01F) appears in 76.9% — most filings claim across both the ceramic composition and the magnetic-component application.
- China-origin filings account for 10 of 13 records, against 2 from the EPO and 1 from the US, putting most of the recent activity and competitive pressure inside Chinese receiving offices.
13
Published Records
+50%
Filing Growth 2021→2024
CN
Leading Jurisdiction
12
Active Filers Ranked
Filing growth compares 2021 (2 records) with 2024 (3) — 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.
Published byPatsnap Research··8 min readSourced from Patsnap Eureka
Field Overview
What this patent landscape covers
Power ferrite materials — principally manganese-zinc ferrite formulations — sit at the intersection of ceramics processing and magnetic component design. Patent activity in this dataset centres on compositional tuning: dopant selection, sintering atmosphere control, and grain boundary engineering aimed at pushing loss minimum temperature and high-frequency performance without sacrificing saturation flux density. The search captures 13 published records spanning 2015 to the 2026 cut-off, drawn from filings that explicitly claim gap loss, grain boundary resistivity or sintering-atmosphere control as part of the invention.
This is a compact, technically specific corpus rather than a sprawling one. That makes individual assignees and individual claims more visible than they would be in a larger field, and it means the white space analysis below can point to genuinely under-filed combinations rather than statistical noise.
Filing activity and technology composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Ferrite Materials for Power Conversion covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
The Data
Filing trend and technology composition
Two views of the same 13-record corpus: how filing activity has moved year over year, and how those records classify across IPC subclasses. Because a single record can carry more than one IPC code, the composition shares below add up to more than 100% of the record total.
Filing trend, 2017-2026
Recorded filings begin in 2017 and rise unevenly to a peak of 3 in 2024, the last year treatable as complete given the roughly 18-month lag between filing and publication. The dataset shows +50% growth from 2021 (2 filings) to 2024 (3 filings) — the same window used in the summary card above. Years after 2024 will continue to fill in as publications catch up, so an apparent dip in 2025-2026 should not be read as a slowdown.
IPC subclass composition
C04B (ceramics, cement and refractories) appears in 12 of 13 records, or 92.3% — confirming that most claims are anchored in the ceramic composition and processing route rather than the finished component. H01F (magnets, inductors and transformers) appears in 10 records, 76.9%, showing that most of those composition claims are paired with a magnetic-component application claim. B28B (shaping of clay and cement products) appears in a single record, 7.7%, marking a much thinner forming/shaping angle on the same chemistry.
Shares are the percentage of the 13 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Ferrite Materials for Power Conversion covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on Ferrite Materials for Power Conversion with Eureka
This page is one run against one query. Ask Eureka your own question about ferrite materials for power conversion and every answer comes back with the patent numbers behind it.
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Most-cited records in this corpus
Representative Filing
EP4563546A1 — Power Ferrite Material, Preparation Method and Use
Hengdian Group DMEGC Magnetics Co. Ltd.
The application discloses a manganese-zinc power ferrite composed of Fe2O3, ZnO and MnO in specified mole-percent ranges, with CaCO3, Nb2O5 and Co2O3 auxiliary components added by weight percent against the main-component mass. The stated aim is a material that keeps low loss across a wide temperature range, achieved through the specific ratio of main to auxiliary components.Filed by Hengdian Group DMEGC Magnetics Co., Ltd., published 2025-06-04.
Highest-citation records
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US3481876A | Manganese zinc ferrite containing calcium oxide and at least one of tantalum oxide and niobium oxide | 6 |
| 2 | CN112979300A | 一种高频低损耗的钽掺杂锰锌铁氧体材料及其制备方法 | 5 |
| 3 | CN107527732A | 一种高强度锰锌铁氧体磁芯制造方法 | 5 |
| 4 | CN113620701A | 一种超细晶耐高温高频锰锌铁氧体制备方法 | 3 |
| 5 | CN118724579A | 一种高功率密度高电阻率低功耗锰锌铁氧体的制备方法 | 2 |
| 6 | CN118047601A | 一种宽频高Tc高导锰锌铁氧体及制备方法 | 2 |
Citation counts inside this searched corpus favour older filings that have had more time to accumulate citations — read them as a signal of influence on the field, not as a ranking of current technical importance.
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. Publication numbers are shown where the record carries one (6 of 6 rows); clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Ferrite Materials for Power Conversion covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for R&D and IP strategy
The corpus is small enough that individual filings carry weight. These are the patterns worth acting on rather than just noting.
Filing Momentum
+50%, 2021→2024
growth over the last complete filing window
Growth is real but the field is still shallow
A 50% rise from 2 filings in 2021 to 3 in 2024 is a meaningful trend in a corpus this size, but it is a trend built on single-digit annual counts. One or two new entrants filing aggressively could shift the leaderboard quickly. Treat any single year's count as noisy and watch the multi-year direction instead.
2024 is the most recent year with complete publication data.
Classification Overlap
92.3% C04B / 76.9% H01F
share of 13 records carrying each class
Composition claims dominate, component claims ride along
Almost every record in scope claims the ceramic composition itself; three-quarters pair that with a magnetics application claim. Filing a composition claim alone, without the paired component claim, is the less-crowded route based on this classification split.
Shares sum to more than 100% because records can carry both classes.
Geographic Concentration
10 of 13 filings
China-origin receiving-office filings
Most competitive pressure sits inside China
Ten of the 13 records in scope were filed through a Chinese receiving office, against two through the EPO and one through the USPTO. Freedom-to-operate work for this material class should prioritise Chinese-language prior art and Chinese assignees first.
Receiving-office split: China 10, EPO 2, US 1.
Collaboration Pattern
2 co-assignee pairs
recorded in the corpus
Filing is mostly solo, not joint
Only two co-assignee pairings appear across the corpus, the stronger one linking a university institute to its parent university. Cross-institutional or university-industry co-filing is not yet a common pattern here, which leaves room for a first-mover joint-filing strategy.
Strongest pair: 2 shared filings between a university and its affiliated research institute.
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to ferrite materials for power conversion, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Ferrite Materials for Power Conversion covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Who's Filing
Assignees and where the field's attention sits
The ranking below covers 12 companies and institutions with published filings in this corpus — this is the whole ranking the data endpoint returns, not a trimmed top-50 or top-100 list. Activity is led by a materials manufacturer, with several university-affiliated filers making up the rest of the ranked field.
Leader
2 records
filings from the top-ranked assignee
A materials manufacturer holds the lead position
The leading assignee in this ranking holds 2 of the 13 records in scope, ahead of a field where most other ranked entrants hold a single filing each. That gap is narrow enough that the leader position is not yet defensible on filing volume alone.
Fifth place and tenth place each hold 1 record.
University Activity
2 shared filings
in the strongest co-assignee pair
University institutes are active but not yet consolidating
A research institute and its parent university account for the strongest co-assignee link in the dataset, but recent-year momentum for both shows a drop to zero in the latest year, a -100% year-over-year change from their prior activity.
A separate pairing links a university and a magnetic-materials manufacturer at 1 shared filing.
Recent Momentum
1 filing, latest year
from the most recently active assignee
Only one tracked assignee shows activity in the latest year
Among the assignees with recent-year momentum data, only one shows a filing in the latest tracked year; the others, including the strongest university pairing, show zero. Given the 18-month publication lag, this likely understates true recent filing activity rather than reflecting a real drop-off.
Momentum figures cover the most recent tracked year only.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Tiantong Holdings Co., Ltd. | 1 | — |
| Hengdian Group DMEGC Magnetics Co., Ltd. | 0 | — |
| Weihai Institute of Industrial Technology, Shandong University | 0 | -100% |
| Shandong University | 0 | -100% |
| University of Electronic Science and Technology of China | 0 | — |
| Nanjing University Hi-Tech Institute at Haian | 0 | — |
| Taizhou Maoxiang Electronic Equipment Co., Ltd. | 0 | — |
| Shandong Kaitong Electronics Co., Ltd. | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Ferrite Materials for Power Conversion covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, R&D targeting, or competitive tracking.
Map claims against the ceramic composition route
With 92.3% of records touching C04B, a freedom-to-operate review should start with composition and dopant-ratio claims before looking at component-level magnetics claims.
Explore composition claims in Eureka →Watch the leader-fifth-place gap close or widen
The leading assignee's 2-record edge over a field of mostly single-filing entrants is thin; tracking whether that gap widens over the next filing cycle indicates whether consolidation is starting.
Track assignee movement in Eureka →Test the under-claimed branches for a first filing
Ultra-fine grain sintering and forming-process claims (B28B) show thin coverage relative to the ceramic composition side of the field, suggesting room for a differentiated first claim.
Run a white-space search in Eureka →Source: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Ferrite Materials for Power Conversion covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on ferrite materials for power conversion patents
The ranked field covers 12 assignees, led by a materials manufacturer holding 2 of the 13 records in scope, with most other ranked entrants each holding a single filing. This is a small, concentrated-at-the-top corpus rather than a field with a dominant multi-hundred-filing leader, so the leader position is not yet locked in on volume alone. University-affiliated institutes also appear in the ranking, often filing individually rather than jointly. Anyone tracking this space should watch year-over-year filing counts rather than relying on a single snapshot ranking.
Most filings target low core loss across a wide operating temperature range in manganese-zinc ferrite, typically by tuning the mole-percent ratio of Fe2O3, ZnO and MnO alongside small additions of dopants such as niobium, calcium or cobalt oxides. Sintering atmosphere and grain boundary resistivity control appear repeatedly as levers for achieving that loss profile. The representative EP4563546A1 filing is a clear example: it specifies both main-component mole ratios and auxiliary-component weight percentages to hold loss low over a temperature range. This composition-first approach explains why C04B, the ceramics classification, touches 92.3% of records in scope.
Filings grew from 2 in 2021 to 3 in 2024, a 50% increase over that three-year window, with 2024 standing as the peak filing year in the dataset so far. Because publication typically lags filing by around 18 months, the apparent count for 2025 and 2026 is still incomplete and should not be read as a decline. The overall pattern across 2017-2026 is one of gradual, uneven growth rather than a sudden surge. Readers should treat any single recent year's count as provisional until later publications catch up.
Based on the classification split, forming and shaping process claims under B28B appear in only 1 of 13 records, a much thinner claim base than the ceramic composition side under C04B. Ultra-fine grain sintering for high-temperature, high-frequency performance and tantalum-doped low-loss compositions also show limited direct coverage relative to their citation influence. These are combinations worth testing with a fresh claim rather than assuming they are already blocked, though any filing strategy should be paired with a full freedom-to-operate search rather than relying on this landscape alone.
Yes: 10 of the 13 records in this corpus were filed through a Chinese receiving office, compared with 2 through the EPO and 1 through the USPTO. That skew means Chinese-language prior art and Chinese assignees, including university-affiliated filers, should be a first stop for any competitive or freedom-to-operate review in this material class. It does not mean activity outside China is absent, only that it is a smaller share of what this dataset captures.
Answers are grounded in the same dataset. Derived from a Patsnap search on Ferrite Materials for Power Conversion covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.