Power Conversion Patents: Top Companies & Filing Trends 2026
Power Conversion Patents: Who Files, Where Activity Is Concentrated, and What's Still Open
13.6% sits with five companies. The top five assignees combined account for 12,671 of the 93,079 records in scope, while the ranked leaders extend to 100 companies with a long tail below them. Filings ran near 1,190 in 2017, peaked at 1,274 in 2019, and dropped 40% from 1,201 in 2021 to 717 in 2024 — the most recent year with a reliable count. 2025 and 2026 figures (56 by the cut-off) will rise as publication catches up, so they should not be read as a continued decline.
- 1MITSUBISHI ELECTRIC CORP4.9%
- 2TOYOTA JIDOSHA KK2.5%
- 3ILLINOIS TOOL WORKS INC2.1%
- 4HITACHI LTD2.0%
- 5DENSO CORP2.0%
See the full power conversion patent landscape 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 the power conversion patent landscape
Who are the top patent holders in power conversion technology?
The dataset ranks 100 companies by patent family count, led by a single assignee with 4,579 records, well ahead of fifth place at 1,859 and tenth at 1,110. The top five combined hold 12,671 records, 13.6% of all 93,079 records in scope, and the top ten hold 21.2%. That leaves most of the ranked field, and an unranked tail beyond it, holding comparatively small shares each, so the field has recognisable leaders but is not dominated by one or two firms.
Is power conversion patent filing growing or slowing down?
Filing peaked at 1,274 records in 2019 and has declined since, falling 40% from 1,201 records in 2021 to 717 in 2024, the most recent year with a reliable count. Figures for 2025 and 2026 look lower still, but that is an artefact of publication lag — publication typically trails filing by about 18 months, so those years will revise upward as more records are indexed. Treat the 2021-2024 comparison as the reliable growth signal, not the raw numbers for the last one to two years.
Which patent classification covers the most power conversion filings?
H02M, the core power-conversion subclass covering AC/DC and DC/DC circuitry, appears on 14.0% of all 93,079 records, making it by far the densest classification in this field. The next most common classes are H02J, power supply and grid systems, at 4.0%, and H02P, motor and generator control, at 2.4%. Because a single record can carry several IPC codes, these shares add up to more than 100%, and a record concentrated in H02M is likely to face the thickest prior art in the dataset.
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 Power Conversion Patent Landscape covering 2015–2026, data cut-off 2026-08-31. 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.