Conducted EMI Filter Design Patents: Leaders & Trends 2026
Conducted EMI Filter Design Patents: Who Leads and Where the Filing Gaps Sit
Concentrated but not locked up. the top five assignees hold 172 of 665 records (25.9%), and the top ten hold 237 (35.6%) — leaving a long tail of single- and few-filing entrants across the rest of the ranking. Volume peaked at 54 records in 2020 and has not returned to that level since, but the most recent complete years show renewed growth: 2021's 14 records rose to 20 by 2024, a 43% increase. 2025 and 2026 figures will continue to fill in as publication catches up with filing, typically an 18-month lag, so the apparent tapering at the very end of the chart understates real activity.
- 1MURATA MFG CO LTD7.4%
- 2GREATBATCH LTD7.1%
- 3ANALOG DEVICES INT UNLTD CO4.8%
- 4TOYOTA INDUSTRIES CORP3.6%
- 5TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)3.0%
See the full conducted emi filter design 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 conducted EMI filter design patents
Who holds the most patents in conducted EMI filter design?
The leading assignee in this 665-record dataset holds 49 records, ahead of a fifth-place assignee at 20 and a tenth-place assignee at 12. The top five assignees combined account for 172 records, or 25.9% of all records in scope, and the top ten account for 237, or 35.6%. That leaves close to two-thirds of the field spread across a long tail of smaller filers, so no single company controls the space outright.
What technology areas dominate conducted EMI filter patents?
Magnetics (IPC class H01F, covering inductors and transformers) and impedance networks and filters (H03H) are the two largest classes, each present in more than a quarter of the 665 records. Power conversion circuitry (H02M) follows closely at 24.5%. Because a single patent can be classified under several IPC codes, these shares overlap rather than summing to 100%, reflecting how tightly choke design, filter topology and power circuitry are bundled together in practice.
Is patent filing activity in conducted EMI filter design increasing or slowing down?
Filing volume peaked at 54 records in 2020 and has not returned to that level, but the most recent complete years show renewed growth: 2021’s 14 records climbed to 20 by 2024, a 43% increase. Figures for 2025 and 2026 appear lower only because publication typically lags filing by around 18 months, so those years are still filling in and should not be read as a genuine slowdown.
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 Conducted EMI Filter Design 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.