Ferrite Magnet Patents: Top Companies & Filing Trends 2026
Ferrite Permanent Magnet and Hard Ferrite Powder Patents
Five companies hold 72.2% of the field. 254 of the 352 records in scope sit with the top five assignees, leaving a long tail of single- and few-filing entrants. Filings ran from 5 in 2017 to a peak of 8 in 2022, then held flat — 2021 to 2024 shows 0% net change (2 filings in both years). This is a field with steady, low-volume filing rather than a growth trajectory; 2025-2026 figures will rise somewhat as publication catches up but are not yet comparable.
- 1SUMITOMO SPECIAL METAL CO LTD131
- 2PROTERIAL LTD57
- 3TDK CORP37
- 4FUJI ELECTROCHEMICAL CO LTD15
- 5AICHI STEEL CORP14
See the full ferrite permanent magnets and hard ferrite powder analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on ferrite magnet patents
Who holds the most patents on hard ferrite magnets?
One assignee leads with 131 of the 352 records in this dataset, and the top five combined hold 254 records — 72.2% of the field. This is a concentrated landscape: the leading company’s portfolio needs to be checked first in any freedom-to-operate review, since the next tier drops off steeply, with fifth place at only 14 records.
Is the ferrite magnet patent field still growing?
Not on the recent evidence. Filing peaked at 8 records in 2022 and the 2021-to-2024 span nets to 0% growth, moving from 2 filings to 2 filings. This reads as a mature, steady-state technology rather than one in active expansion, though publication lag means 2025-2026 figures are still incomplete and will rise somewhat as more records publish.
What is the difference between ferrite magnets and rare-earth magnets in these patents?
The records in this dataset centre on strontium and barium ferrite compositions (magnetoplumbite-type structures), which are lower-cost and lower-performance than rare-earth alternatives like neodymium magnets. Several records, including the representative filing here, combine a rare-earth magnetic powder with a ferrite powder in a single resin-bonded magnet, suggesting the two material families are often claimed together rather than as pure substitutes.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Ferrite Permanent Magnets and Hard Ferrite Powder covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.