VRFB Flow-Field & Stack Design Optimization Patent Snapshot
This is a highly concentrated, early-growth niche: a single applicant, HydraRedox Tech Holdings, accounts for the dominant share of filings, and the field recorded a notable uptick in activity in 2024. The evidence snapshot spans seven patent families across multiple jurisdictions, with the United States as the primary filing office.
HydraRedox Tech Holdings leads a tightly held, nascent patent space
HydraRedox Tech Holdings sits atop the applicant ranking with 7 patent records, making it the single most active filer in VRFB flow-field and stack design optimization by a clear margin. Jen Catholic University and Korea Advanced Institute of Science and Technology each follow with 3 patent records.
The top five filers account for 88% of the combined output of the ranked applicants visible in this query, signalling an unusually concentrated visible assignee structure. The tier gap between the leader and the rest of the field is substantial, with no second applicant approaching HydraRedox’s volume.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | HydraRedox Tech Holdings | 7 | |
| 2 | Jen Catholic University | 3 | |
| 3 | KOREA ADVANCED INST OF SCI & TECH | 3 | |
| 4 | Suzhou Anlan Zhirun Energy Technology Co., Ltd. | 1 | |
| 5 | Tianjin University | 1 | |
| 6 | Huatan New Materials Technology (Suqian) Co., Ltd. | 1 | |
| 7 | Sichuan Development Xingxin Vanadium Energy Technology Co., Ltd. | 1 |
This concentration implies that the visible player has already staked broad positional claims in stack and flow-field architecture; entrants must either design around existing claims or focus on adjacent sub-problems — such as nanotechnology-enhanced electrode materials — where coverage remains thin.
Activity in the most recent 18–24 months is likely under-counted due to standard patent publication lag; apparent 2025–2026 figures should be treated as provisional. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing activity accelerating since 2021, anchored in electrochemical cell IPC classes
Annual filing volume was absent through 2020, emerged in 2021, and surged to its highest recorded level in 2024, consistent with a growth-stage field. The technology composition is dominated by a single IPC class, with one adjacent branch providing a sparse but visible signal.
Annual filing trend
Filings were zero from 2017 through 2020, then recorded two patents in 2021, a gap in 2022–2023, and a peak of four in 2024. The 2025 and 2026 figures should be read as provisional minimums given publication lag — real activity for those years is likely higher.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (Batteries, cells and fuel cells) accounts for the overwhelming majority of classified records at 17, while B82Y (Nanotechnology applications) appears with just 1 record. The near-complete concentration in H01M reflects a field focused on electrochemical cell and stack architecture, with nanotechnology-enabled electrode approaches forming a sparse but technically distinct adjacent branch.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Electrode structure of vanadium redox flow battery
An electrode structure of a vanadium redox flow battery is disclosed, which includes a proton-exchange membrane, two graphite papers, two graphite felt units, two pads, two graphite polar plates, two metal plates and a lock-fixing device which are symmetrically stacked in sequence from center to outside. wherein each graphite polar plate has the flow… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | ALL-VANADIUM REDOX FLOW BATTERY SYSTEM EMPLOYING A… | 14 |
| 2 | Electrode structure of vanadium redox flow battery | 12 |
| 3 | 一种全钒液流电池电堆结构 | 8 |
| 4 | Electrode structure of a vanadium redox flow battery | 8 |
| 5 | ALL-VANADIUM REDOX FLOW BATTERY SYSTEM EMPLOYING A… | 5 |
| 6 | Electrode structure of a vanadium redox flow battery | 2 |
| 7 | 一种用于液流电池的原位自支撑铋纳米片修饰电极及制备方法、应用 | 1 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
HydraRedox Tech Holdings
With 7 patent records, HydraRedox Tech Holdings holds the largest position in this landscape by a wide margin. Their technology focus is concentrated in H01M 8 (stack and fuel cell structures), with 4 records in that class. A related entity, HydraRedox Tech, contributes an additional 3 H01M 8 records, reinforcing the group’s depth in core stack architecture.
patent records: 7Korea Advanced Institute of Science and Technology
Korea Advanced Institute of Science and Technology holds 3 patent records, split evenly between H01M 4 (electrode materials) and H01M 8 (stack design), showing a broader technical footprint than most peers. Their momentum trend is flagged as a new entrant, indicating recent filing activity not offset by a prior-period base — making them the most technically diversified of the emerging academic filers.
patent records: 3Frequently asked questions
The dataset in scope contains 7 patent families. This reflects a nascent, specialized niche rather than a broad technology category, and the relatively small corpus means individual filings carry significant weight in shaping the assignee snapshot.
HydraRedox Tech Holdings leads with 7 patent records, placing it well ahead of the next-ranked applicants — Jen Catholic University and Korea Advanced Institute of Science and Technology — each with 3 patent records.
The evidence places the field in a Growth stage. Annual filings were zero through 2020, rose from 2021, and reached their highest recorded level in 2024. Recent years are likely under-counted due to publication lag.
The United States leads with 6 patent records, followed by China with 4, and Australia and Taiwan with 2 each. Europe (EPO), India, and WIPO (PCT) each have 1 record, indicating limited multi-jurisdictional protection so far.
No co-applicant filings are present in the evidence for this landscape. All active applicants appear to be filing independently, which is consistent with an early-stage field where cross-institutional partnerships have not yet materialized.
B82Y (Nanotechnology applications) is the only IPC branch adjacent to the visible H01M class, with just 1 patent record and a 6% share. Multi-jurisdictional coverage via EPO and PCT is also sparse, with only 1 record each, representing areas of low existing IP density.
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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.