Alkaline Water Electrolysis Stacks Patents: Top Companies & Trends 2026
Alkaline Water Electrolysis Stack Patents: Who Holds the Ground
39.3% concentration. The five leading assignees together hold 201 of the 512 records in scope — a field with a defined top tier rather than a flat field of equal filers. Filings climbed from 2 in 2017 to a peak of 90 in 2024, with 2021-2024 alone up 29%. The 2025-2026 counts are partial due to publication lag and will revise upward as later filings publish.
- 1AGFA GEVAERT NV83
- 2HYSATA PTY LTD44
- 3INDUSTRIE DE NORA SPA38
- 4TOTALENERGIES ONETECH21
- 5STIESDAL HYDROGEN AS15
See the full alkaline water electrolysis stacks 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 patents on alkaline water electrolysis stacks?
One assignee leads clearly with 83 of the 512 records in scope, well ahead of the fifth-ranked filer at 15. The gap between first place and the rest of the top tier is wide, while the drop from fifth to tenth place (15 to 13) is comparatively shallow, indicating a small leading portfolio followed by a broader second tier of active filers. Anyone doing competitive review should treat the leader’s portfolio as the priority read before working through the rest of the ranking.
Is patent filing in alkaline electrolyzer stacks still growing?
Yes, based on complete-year data: filings rose from 70 records in 2021 to 90 in 2024, a 29% increase over that three-year span, with 2024 as the peak year so far. The apparent decline in 2025 and 2026 figures is a publication-lag artefact — patent applications typically take around 18 months to publish, so recent years are always undercounted at the time of any analysis. The underlying trend through the last complete year is upward, not falling.
Which technology classes cover alkaline water electrolysis stack patents?
The large majority, 91.8% of the 512 records, fall under IPC class C25B, electrolytic production of compounds, confirming the core of this field is the electrolytic process itself. Adjacent classes appear at much lower shares: H01M (batteries, cells and fuel cells) at 21.3%, C08J (polymer processing) at 10.5%, and B01D (separation processes) at 8.8%. Because a single record can carry multiple IPC classes, these percentages should be read individually against the full 512-record base rather than summed.
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 Alkaline Water Electrolysis Stacks 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.