Hydrogen Ventilation Control Patents: Who Leads, Trends 2026
Filing growth compares 2021 (120 records) with 2024 (121) — 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 1,942 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Hydrogen ventilation control sits at the intersection of fuel-cell system design, gas safety monitoring, and building or vehicle-cabin air handling. The 1,942 records in scope span filings from 2015 through the current data cut-off, capturing everything from hydride storage venting schemes to sensor-triggered airflow controllers. Because a single record often carries claims across several IPC subclasses, the technology composition below reflects overlapping claim territory rather than a clean split between disciplines.
Filing activity climbed through the late 2010s, peaked in 2022, and has since settled into a plateau rather than a decline — the 2021-to-2024 comparison shows filings essentially flat. Readers should treat the most recent one to two years of published data as understated, since publication typically lags filing by around 18 months.
Filing trend and claim composition
Two views of the same 1,942-record corpus: how filing volume has moved year over year, and where those filings land across IPC subclasses.
A plateau, not a retreat
Filings rose from 63 in 2017 to a peak of 145 in 2022, then eased back; the 2021-to-2024 window is flat at +1% (120 to 121), and 2025 onward should be read as still filling in rather than as a real drop.
Power systems outweigh airflow hardware
H01M (batteries and fuel cells) leads at 16.9% of the 1,942 records, ahead of A61K medicinal preparations at 7.8%, F24F air conditioning and ventilation at 7.7%, A61L sterilising and disinfecting at 7.6%, and B01D separation processes at 7.2% — the ventilation-control claim itself is often a smaller piece of a larger fuel-cell or safety filing.
Shares are the percentage of the 1,942 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: Hydrogen Ventilation Control Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about hydrogen safety & detection: hydrogen ventilation control patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaA representative filing
Hydrogen fuel cell driven HVAC and power system for engine-off operation including PEM regenerative hydrogen production
A hydrogen fuel cell driven HVAC and power system for powering a vehicle during engine-off time. The system integrates a power storage and fuel cell conversion unit with a high-efficiency reverse cycle heat pump to provide cab comfort and auxiliary power when the engine is off. Hydrogen is generated from vehicle wasted energy during coasting and braking, then stored safely in metal hydride containers at low pressure; during engine-off periods a fuel cell draws on that stored hydrogen and works with the heat pump to heat, cool and power the vehicle.Filed by Marz Industries; a good illustration of how ventilation control claims are typically bundled inside a broader fuel-cell power architecture rather than filed standalone.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20010049080A1 | Heat treatment system and method | 488 |
| 2 | US5272871A | Method and apparatus for reducing nitrogen oxides from internal combustion engine | 334 |
| 3 | US20050120715A1 | Heat energy recapture and recycle and its new applications | 296 |
| 4 | US20150143806A1 | Quintuple-Effect Generation Multi-Cycle Hybrid Renewable Energy System with Integrated Energy Provisioning, S… | 268 |
| 5 | US20040118309A1 | Apparatus, systems and methods for use in three-dimensional printing | 230 |
| 6 | US20150071978A1 | Clothing and covering system with various functions | 190 |
| 7 | US8147302B2 | Multipoint air sampling system having common sensors to provide blended air quality parameter information for… | 186 |
| 8 | US20120252709A1 | Vessels, contact surfaces, and coating and inspection apparatus and methods | 180 |
| 9 | US20070134197A1 | Conjugates of hydroxyalkyl starch and a protein, prepared by reductive amination | 169 |
| 10 | US20050269254A1 | [Air and Water Purifying System And Filter Media] | 147 |
Citation counts reflect influence within this searched corpus and skew toward older filings; they are not a measure of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-throughs on concentration, technology mix and receiving-office spread that matter more than the raw record count.
No single company controls the field
The ranked leader holds 51 records and the top 5 combined reach only 9.3% of the 1,942 records in scope, with the tenth-ranked assignee already down to 19. That is a long tail of single- and few-filing entrants rather than a market locked up by two or three incumbents.
Volume has plateaued since the 2022 peak
Filings rose sharply into a 2022 peak of 145, then settled back; the 2021-to-2024 comparison of 120 to 121 records shows essentially flat activity, not a growth trend and not yet a decline once the publication lag is accounted for.
Fuel-cell system claims dominate over pure airflow hardware
H01M (batteries and fuel cells) appears in 16.9% of the 1,942 records, more than double the 7.7% carrying F24F air conditioning and ventilation classifications. Sterilising/disinfecting (A61L, 7.6%) and separation processes (B01D, 7.2%) trail close behind, suggesting airflow control is usually claimed as a subsystem, not the primary invention.
Filing activity is spread across major offices, not concentrated in one
China leads receiving-office volume at 360, followed by the United States at 306 and South Korea at 302; Europe (209), WIPO/PCT (141) and Australia (90) round out a corpus that is genuinely multi-jurisdictional rather than dominated by a single filing route.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hydrogen safety & detection: hydrogen ventilation control patent landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Hyundai Motor Company | Kia Corporation | 7 |
| Fresenius Kabi Deutschland GmbH | ZANDER NORBERT | 5 |
| Fresenius Kabi Deutschland GmbH | HACKET FRANK | 5 |
| Fresenius Kabi Deutschland GmbH | FRANK RONALD | 5 |
| Fresenius Kabi Deutschland GmbH | EICHNER WOLFRAM | 5 |
| Fresenius Kabi Deutschland GmbH | CONRADT HARALD | 5 |
| Fresenius Kabi Deutschland GmbH | SOMMERMEYER KLAUS | 4 |
| Fresenius Kabi Deutschland GmbH | SCHIMMEL MARTIN | 4 |
Only 10 co-assignee pairs appear in this corpus, and the strongest pairings sit inside single corporate groups or between a company and named individual inventors — collaboration outside those existing structures is rare.
Turning this landscape into a filing or freedom-to-operate decision
The record counts and rankings on this page describe where claims already sit. Deciding where to file next, or whether a design is clear, means running the same questions against the full claim text.
Check freedom-to-operate before drafting
With 100 ranked assignees and only a 9.3% share held by the top 5, a new filer needs to check specific claim scope rather than assume a dominant incumbent blocks the space.
Run a freedom-to-operate check in EurekaTrack the plateau, not just the peak
Flat 2021-to-2024 filings after a 2022 peak can mean either a maturing subfield or a shift in where applicants are filing; watching quarterly filings as 2025-2026 data fills in will clarify which.
Set up a filing-trend alert in EurekaSeparate airflow claims from fuel-cell system claims
Because F24F ventilation claims are usually bundled inside broader H01M fuel-cell filings, a targeted search on the airflow-control mechanism alone will surface a different, smaller set of blocking art.
Search claim-level detail in EurekaCommon questions on hydrogen ventilation control patents
This dataset counts 1,942 published records in scope, spanning filings from 2015 through the mid-2026 data cut-off. The same 1,942 figure is used as the assignee ranking's family total, so comparisons of company share and technology share both use it as the denominator. Because publication lags filing by roughly 18 months, the true count for the last one to two filing years will be higher once those applications publish.
The ranking covers 100 assignees, with the leader holding 51 records and the tenth-placed company down to 19. The top 5 companies combined account for 9.3% of all 1,942 records, and the top 10 for 15.2% — a meaningful lead position but not control of the field. Most of the ranking is a long tail of companies with a handful of filings each, which is typical for a cross-disciplinary safety and systems technology rather than a single-product category.
Filings grew from 63 in 2017 to a peak of 145 in 2022, then eased. Comparing full calendar years, 2021 (120 filings) to 2024 (121 filings) shows a flat trend of about 1% growth, not a decline. Treat 2025 and 2026 figures as understated rather than as evidence of a slowdown, since publication lag means recent filings are still working their way into the public record.
Batteries and fuel cells (IPC class H01M) is the largest overlapping class at 16.9% of the 1,942 records, reflecting how ventilation and gas-safety claims are frequently filed as part of a broader fuel-cell system. Air conditioning and ventilation hardware itself (F24F) sits lower at 7.7%, alongside sterilising/disinfecting (A61L, 7.6%), separation processes (B01D, 7.2%) and pressure vessel/gas storage claims (F17C, 4.4%). A record can carry more than one of these classes, so the shares add up to more than 100%.
The technology composition shows heavy claim density in fuel-cell system integration (H01M) and lighter, more specific coverage in the pure air-handling mechanism (F24F) and gas storage safety (F17C). A first filer targeting the sensor-to-actuator control logic for hydrogen leak-triggered ventilation, rather than the surrounding fuel-cell architecture, is more likely to find open claim space than one filing another general fuel-cell power system.
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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.