Gas Insulated Switchgear Design Patents: Who Leads and Where the Gaps Sit
Filings are concentrated but not locked up. The top five assignees hold 33.5% of all 1,814 records in scope, and the top ten hold 44.1% — leaving well over half the field to a long tail of single- and few-filing entrants. Filings rose from 73 in 2017 to a peak of 126 in 2023, with 2021-to-2024 volume up 22% (95 to 116). 2026 figures (28 so far) are partial and will revise upward as later publications land.
- 1STATE GRID CORPORATION OF CHINA197
- 2MITSUBISHI ELECTRIC CORP126
- 3KK TOSHIBA115
- 4PRYSMIAN SPA108
- 5KOREA ELECTRIC POWER CORP61
See the full gas insulated switchgear 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 about GIS design patents
Who holds the most gas insulated switchgear patents?
The leading assignee in this dataset holds 197 of the 1,814 records in scope, with a steep drop to 61 records at fifth place and 32 at tenth place. State-owned grid operators, diversified electronics majors and national power research institutes make up most of the top of the ranking. The gap between first place and the rest of the ranked leaders is large enough that no single company controls the field outright, which leaves room for new entrants to build a defensible position rather than simply licensing around an incumbent.
What share of GIS patents relate to partial discharge detection rather than the switchgear hardware itself?
Measurement and diagnostic classifications dominate: 73.0% of the 1,814 records carry an electric & magnetic measurement (G01R) classification, compared with 17.4% for power switchboard & substation hardware (H02B) and 9.9% for switches & relays (H01H). Because a single record can carry several IPC codes, these figures add up to more than 100% of the record total. In practical terms, the sensing and diagnostic layer around GIS equipment is a far more actively claimed space than the enclosure or switching hardware itself.
Is patent filing activity in gas insulated switchgear still growing?
Yes, on the most recent complete data: filings rose 22% from 95 in 2021 to 116 in 2024, with a peak year of 126 filings in 2023. Figures for 2025 and 2026 appear lower, but that reflects publication lag of roughly 18 months rather than a genuine slowdown — those years will revise upward as more filings publish. Anyone reading the trend line should treat the last one to two years as incomplete rather than declining.
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 Gas Insulated Switchgear 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.