Hydrogen Safety & Detection Patents: Leaders, Trends & Gaps 2026
- Concentrated at the top. The five leading assignees hold 108 of 325 records in scope (33.2%), and the top ten hold 149 (45.8%) — roughly half the field sits with a long tail of single- and low-count filers.
- Filing is still climbing, not cooling. Counts run from 16 in 2021 to 22 in 2024, a 38% rise over that span; 2025-26 figures are still filling in as publication lags filing by around 18 months.
- Material analysis dominates the claim mix. G01N testing and measurement touches 34.2% of all 325 records, ahead of H01M fuel cell/battery classes (24.3%) and C25B electrolytic production (20.3%).
Filing growth compares 2021 (16 records) with 2024 (22) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 325 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks 325 published records filed against hydrogen safety and detection concepts intersected with pressure, purity, catalyst, stack-temperature and vessel terms. The scope spans leak and stress detection, gas purification and purity monitoring, electrode catalyst work tied to electrolytic hydrogen production, and pressure vessel design for compressed storage. Coverage runs from 2015 through the current data cut-off of 2026-08-31, with 2017 as the first year carrying meaningful volume.
Patent families, not raw document counts, are the fairer unit for reading concentration here, since they neutralise continuation filings and multi-jurisdiction duplicates. The assignee ranking below is built on the same family basis: 100 companies are ranked, out of 325 records total, so read any share against that denominator rather than against the ranked list itself.
Filing trend and technology composition
Two views of the same 325-record set: how filing volume has moved year over year, and how those records distribute across IPC subclasses.
Filing trend, 2017-2026
Volume climbed from 13 records in 2017 to a peak of 58 in 2018, before settling into a steadier band. The 2021-2024 window shows renewed growth (16 to 22, +38%); treat 2025 and 2026 as undercounts still filling in, not as a slowdown.
IPC subclass composition
G01N material analysis and testing appears in 34.2% of the 325 records, the single largest technical thread, followed by H01M fuel cells and batteries at 24.3% and C25B electrolytic production at 20.3%. Because records can carry multiple IPC codes, these shares sum to well over 100% and should not be added together.
Shares are the percentage of the 325 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Hydrogen Safety & Detection Patent Landscape with Eureka
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Try EurekaRepresentative and most-cited records
Hydrogen pressure vessel (US20260016125A1)
The filing claims a hydrogen pressure vessel built from a shell with an internal volume, arranged to store compressed hydrogen above 200 bar, formed from steel with a yield strength of at least 355 MPa, and constructed from a multitude of longitudinally extending shell segments each defined by a circumferential wall of specified thickness and internal diameter.Filed by Tenaris Connections B.V., published 2026-01-15 — one of the most recent filings in scope.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20030173958A1 | Applied and residual stress measurements using magnetic field sensors | 66 |
| 2 | US7028724B2 | Fueling nozzle with integral molecular leak sensor | 64 |
| 3 | US20040056654A1 | Magnetic field characterization of stresses and properties in materials | 56 |
| 4 | US6492043B1 | Method and apparatus for detecting a leak within a fuel cell | 47 |
| 5 | US20070087241A1 | Fuel cell power pack | 42 |
| 6 | US20020110713A1 | Fuel cell assembly with an improved gas sensor | 37 |
| 7 | US4560444A | Gas detection with novel electrolyte membrane and solid internal reference | 33 |
| 8 | US20030089426A1 | Vacuum carburizing with napthene hydrocarbons | 31 |
| 9 | EP1111703A2 | Fuel cell assembly with an electrochemical gas sensor and method of fabricating said sensor | 30 |
| 10 | US5858204A | Electrochemical sensor and process for assessing hydrogen permeation | 28 |
Citation counts reflect a corpus that has had more time to accumulate references to older records; treat them as a signal of influence rather than of current technical relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-outs from the dataset that matter more than the headline counts.
Half the field sits outside the leaders
The top five assignees combine for 33.2% of all 325 records and the top ten for 45.8%. That leaves more than half the field to a long tail of entrants filing once or twice — a sign that claim space outside the leaders' core lines is still being staked out rather than closed.
Growth is real but recent years understate it
Filings rose from 16 in 2021 to 22 in 2024, a 38% increase over that three-year span. Because publication trails filing by roughly 18 months, the lower counts shown for 2025 and 2026 are incomplete, not evidence of a cooling trend.
Detection and analysis carry the most claim density
G01N material analysis and testing appears across over a third of the 325 records, ahead of fuel-cell/battery classes (H01M, 24.3%) and electrolytic production (C25B, 20.3%). Pressure vessel claims under F17C, at 6.8%, are comparatively sparse given the topic's storage-safety framing.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hydrogen safety & detection patent landscape, with the prior art for and against each one.
Who is filing, and where the gaps sit
The leader holds 54 records; by fifth place that drops to 10, and by tenth place to 7 — a steep early drop-off followed by a long, shallow tail typical of a field still being defined rather than locked down by one player.
One clear leader, then a steep drop
The leading assignee's count is more than five times the fifth-place figure of 10, which itself is only slightly ahead of the tenth-place figure of 7. Most of the ranked field files in single digits.
US filing leads, PCT and EPO close behind
The United States receives the largest share of filings (107), ahead of the EPO (52) and WIPO/PCT (32). Japan, Canada and China each carry smaller but non-trivial counts (24, 17 and 16 respectively), pointing to a genuinely multi-jurisdictional field rather than a single-market technology.
Co-filing is rare and mostly university-linked
Only seven co-assignee pairs appear across the dataset, and the strongest is a university-inventor pairing rather than a corporate joint venture. Cross-company collaboration is not yet a defining feature of this landscape.
| Assignee | Recent year | YoY |
|---|---|---|
| Energy 13 GmbH | 1 | -67% |
| Evoqua Water Technologies LLC | 0 | — |
| Delft University of Technology | 0 | — |
| Saudi Arabian Oil Co. (Saudi Aramco) | 0 | — |
| University of New Brunswick | 0 | — |
| Air Products and Chemicals, Inc. | 0 | — |
| Tenaris Connections B.V. | 0 | -100% |
| Ballard Power Systems Inc. | 0 | — |
Where to take this
The dataset points to specific next steps rather than a single conclusion.
Check freedom-to-operate against the leader's core claims
With one assignee holding 54 records against a fifth-place figure of 10, any filing near that leader's core detection or vessel claims needs a dedicated clearance search before drafting.
Run a claim comparison in EurekaTest the under-claimed branches for a defensible first claim
Stack-temperature sensing and gas-purity monitoring show thinner filing density than the topic's overall safety framing would suggest, which is where a narrowly drafted first claim has the most room.
Explore white space in EurekaCommon questions on hydrogen safety and detection patents
The ranking covers 100 companies across 325 records, with the leading assignee holding 54 records on its own — more than five times the count held by the fifth-ranked filer at 10. The top five assignees combined account for 33.2% of all records, and the top ten for 45.8%, which means more than half the field is spread across a long tail of entrants filing only a handful of records each. Anyone assessing competitive position should treat the leader's share as a strong signal of an entrenched position, but should not assume the rest of the field is closed off, since the tail is wide and thin.
Yes, based on the most recent complete years: filings rose from 16 in 2021 to 22 in 2024, a 38% increase over that three-year span. The overall trend peaked earlier, at 58 records in 2018, then settled into a steadier pace before this recent uptick. Figures for 2025 and 2026 appear lower, but that reflects the roughly 18-month lag between filing and publication rather than declining interest, so those two years should not be read as a slowdown.
Material analysis and testing under IPC class G01N appears in 34.2% of the 325 records in scope, making it the single most common technical thread — this covers leak detection, stress measurement and related sensing work. Fuel cells and batteries (H01M) follow at 24.3%, and electrolytic production of compounds (C25B) at 20.3%, reflecting the strong link between hydrogen safety claims and electrolytic hydrogen generation. Pressure vessel and gas storage claims under F17C are comparatively sparse at 6.8%, which is notable given how central vessel safety is to the topic's framing.
Several sub-areas show filing density well below what the topic's safety scope would suggest, including in-situ stack-temperature sensing, real-time gas-purity monitoring integrated into purification loops, and catalyst degradation detection under load cycling. These sit adjacent to the heavily claimed G01N and H01M classes but are not yet saturated. A first claim in these areas would need to combine a specific sensing or monitoring method with a defined operating condition — pressure, temperature or purity threshold — rather than claiming the sensing concept broadly.
The United States receives the largest share of filings at 107, followed by the European Patent Office at 52 and the WIPO/PCT route at 32. Japan (24), Canada (17) and China (16) each carry meaningful but smaller counts. The spread across these offices indicates that hydrogen safety and detection technology is being protected as a multi-jurisdictional concern rather than concentrated in one national market, which matters for any freedom-to-operate assessment that only checks a single jurisdiction.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.