Voltage Sag Immunity Patents: Top Companies & Filing Trends 2026
Voltage sag and interruption immunity patents: who holds ride-through claim space
Top 5 assignees hold 50.6% of the field. 39 of the 77 records in scope sit with just five companies, with a leader at 14 filings and a long tail below that. Filings began at 1 in 2017, rose to a peak of 7 in 2018, and have since settled into a flat pattern — 2 filings in 2021 and 2 again in 2024, a 0% change over that three-year span. 2025 and 2026 figures will keep rising as publications catch up with roughly 18 months of filing-to-publication lag, so the most recent two years should not be read as a decline.
- 1YORK INTERNATIONAL CORP14
- 2STATE GRID CORPORATION OF CHINA8
- 3JOHNSON CONTROLS TECHNOLOGY CO8
- 4TYCO FIRE & SECURITY GMBH5
- 5NORTH CAROLINA STATE UNIV4
See the full voltage sag and interruption immunity 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 voltage sag ride-through technology?
One assignee leads with 14 of the 77 records in scope, well ahead of fifth place at 4. The top 5 assignees combined hold 50.6% of all records, and the top 10 reach 75.3%, so ownership is concentrated but not closed — roughly a quarter of the field is split among a long tail of smaller filers. Reviewing the leader’s full portfolio, not just its most-cited patents, is the right starting point for any competitive or freedom-to-operate analysis.
Is patent filing in voltage sag immunity growing or slowing down?
Filing activity peaked in 2018 at 7 records and has since settled to a flat rate, with 2 filings in 2021 and 2 again in 2024 — a 0% change over that span. The 2025 and 2026 figures in any dataset like this will look artificially low because publication typically lags filing by around 18 months, so those final years should not be read as a genuine slowdown. The honest read is flat, steady activity rather than growth or decline.
What technology areas dominate voltage sag and ride-through patents?
Power supply and grid systems (IPC H02J) appear in 45.5% of the 77 records, and power conversion (H02M) in 37.7%, making these two subclasses the technical core of most filings. Motor and generator control (H02P) and protective circuits (H02H) follow at lower shares, while measurement (G01R) and switches/relays (H01H) are thinner still. Because a single record can carry multiple IPC codes, these shares add up to more than 100% and should be read as overlap, not a strict breakdown.
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 Voltage Sag and Interruption Immunity 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.