Transformers & Switchgear Patents: Top Companies & Filing Trends 2026
Transformers and Switchgear Patents: Who Leads and Where Filing Is Heading
Leadership is thin at the top. the top 5 assignees together hold just 13.7% of the 3,605 records in scope, and the top 10 only 20.0% — no single company controls the field. Filings peaked at 171 records in 2017. From a 2021 level of 127, volume fell to 79 by 2024 — a 38% decline over that three-year span. Treat 2025 and 2026 as still filling in rather than as evidence of a further drop.
- 1SCHWEITZER ENGINEERING LABORATORIES INC6.9%
- 2GENERAL ELECTRIC CO2.1%
- 3GOOGLE LLC1.7%
- 4ASATOR GLOBAL TECHNOLOGIES LLC1.6%
- 5EMPRIMUS LLC1.5%
See the full transformers & switchgear 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 on this landscape
Who holds the most transformer and switchgear patents?
One assignee leads the ranked list with 249 records, well clear of the rest of the field — fifth place holds 54 and tenth place holds 43. That drop-off after the leader means the field is not evenly distributed at the very top, but it is also not dominated by a single company overall: the top 5 assignees combined account for only 13.7% of the 3,605 records in scope, and the top 10 for 20.0%. Most of the corpus sits with a long tail of companies filing far fewer records each.
Is filing activity in transformers and switchgear growing or shrinking?
Filing peaked in 2017 at 171 records and has eased since, with the reliably comparable window showing a drop from 127 records in 2021 to 79 in 2024 — a 38% decline over three years. The years after 2024 are not a safe basis for a trend call because publication typically lags filing by around 18 months, so 2025 and 2026 figures will keep rising as more records surface. The honest read is a post-peak cooldown through 2024, not a confirmed continued fall.
What technology areas get the most patent claims in this space?
Power conversion (H02M) is the largest single class at 20.3% of the 3,605 records, followed by power supply and grid systems (H02J) at 17.8%, protective circuit arrangements (H02H) at 15.3%, and electric and magnetic measurement (G01R) at 14.2%. Because records often carry more than one IPC class, these figures overlap rather than sum to 100%. Switches and relays (H01H) and heating/lighting circuits (H05B) trail well behind, each just above 5% of records, marking comparatively thinner claim coverage.
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 Transformers & Switchgear 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.