Bonded and Injection Molded Magnets Patents: Top Companies & Trends 2026
Bonded and Injection Molded Magnets: Patents, Leading Filers and Where Filing Is Heading
46.4% of all 2,702 records in scope sit with just five assignees — this is a concentrated field, not a fragmented one. Filings ran from 51 in 2017 to a peak of 67 in 2021, then fell to 21 by 2024 — a 69% drop across that three-year span. 2025 and 2026 counts are still filling in and should not be read as continued decline.
- 1SEIKO EPSON CORP15.2%
- 2PROTERIAL LTD9.4%
- 3TDK CORP7.9%
- 4SUMITOMO SPECIAL METAL CO LTD7.0%
- 5AICHI STEEL CORP6.7%
See the full bonded and injection molded magnets 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 about this landscape
Who holds the most patents on bonded and injection molded magnets?
Filing in this field is concentrated: the top five assignees together hold 46.4% of the 2,702 records in scope, and the top ten hold 60.2%. The leading assignee alone accounts for 412 records, well ahead of the fifth-place figure of 182 and the tenth-place figure of 54. These are largely established Japanese electronics and specialty-metals manufacturers who built core alloy and powder positions early, so a newcomer should expect to file around, not through, that existing claim territory.
Is patent filing in bonded magnets growing or shrinking?
Filing peaked in 2021 at 67 records and fell to 21 by 2024, a drop of 69% over that three-year span — the most recent period for which the data can be treated as complete. Figures for 2025 and 2026 look lower still, but that is expected: publication typically lags filing by about 18 months, so the newest years always understate real activity. The honest read is a real pullback from the 2021 peak, not an ongoing collapse.
What technology areas dominate the IPC classification in this field?
H01F, the class covering magnets, inductors and transformers, appears in 85.1% of the 2,702 records and is effectively the anchor classification for the field. Beneath it, B22F (powder metallurgy) appears in 34.2% of records and C22C (alloys) in 30.3%, showing that a large share of the technical differentiation happens in how the magnetic powder and alloy are prepared, not just in the finished-magnet design. Because a single record can carry several IPC codes, these shares add up to more than 100% and should be read individually, not summed.
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 Bonded and Injection Molded Magnets 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.