Asymmetric Supercapacitor Patents: Leaders, Trends & White Space 2026
- Filing has cooled since its 2017 peak. 36 families filed that year versus 9 in the most recent (partial) year, with the 2022 midpoint of 15 confirming a declining rather than flat trend.
- Claim activity splits almost evenly across two IPC subclasses. H01M (batteries, cells & fuel cells) and H01G (capacitors) sit within two records of each other at 176 and 174, showing the field is genuinely hybridised rather than owned by one classification.
- The most-cited prior art predates the asymmetric-interface framing. The top five cited records, led by US20120171574A1 at 127 citations, are foundational energy-storage-device patents from the early 2010s rather than recent interface-specific filings.
What this landscape covers
This landscape tracks patent families at the intersection of asymmetric and hybrid supercapacitor design and electrode-electrolyte, electrode-collector or interfacial-resistance claims — the engineering problem of getting two dissimilar electrode chemistries to share a stable, low-resistance interface. It spans 301 published families filed between 2015 and the 2026 data cut-off.
Filing offices skew toward the United States and India, with a smaller but steady share routed through the EPO and WIPO's PCT track, indicating the technology is pursued for both large single-market protection and multi-jurisdiction hedging rather than one dominant filing strategy.
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Filing trend and technology mix
Two views of the same 301 families: how filing activity has moved year over year, and which IPC subclasses carry the claim volume.
Filing trend: a 2017 peak followed by decline
Filings peaked at 36 in 2017, fell to a midpoint of 15 by 2022, and stand at 9 in the most recent partial year. Because publication typically lags filing by around 18 months, the final one or two years will revise upward as more records publish — but the multi-year decline from the 2017 peak predates that lag effect and reflects a genuine slowdown in new filing activity.
IPC composition: batteries and capacitors run neck and neck
H01M and H01G together account for the large majority of records (176 and 174 respectively), confirming that asymmetric supercapacitor interface work is claimed almost as often from the battery side as the capacitor side. Smaller clusters in organo-metallic compounds (C07F), inorganic compounds (C01B, C01G), nanotechnology (B82Y) and heterocyclics (C07D) mark the materials-chemistry periphery of the field.
Shares are the percentage of the 301 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Asymmetric Supercapacitor Interface Engineering with Eureka
This page is one run against one query. Ask Eureka your own question about asymmetric supercapacitor interface engineering and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited prior art and a recent representative filing
US20250232925A1 — Neodymium-based MOF synthesis for a hybrid supercapacitor system
The present invention generally relates to a process for synthesizing neodymium-based metal-organic frameworks (Nd-PTA-MOF), comprising: dissolving 166.13 mg of neodymium nitrate hexa-hydrate in 2 ml of distilled water to form a first solution; dissolving 80 mg of pyridine-2,4,6-tri-carboxylic acid (PTA) in 5 ml of distilled water to form a second solution; mixing the first solution and the second solution in a round bottom flask with magnetic stirring while heating; adding two drops of liquid ammonia to the mixture; refluxing the mixture for 2 hours at a temperature in the range of 120-150°C; allowing the mixture to crystallize over a period of seven days to form purple-colored Nd-PTA-MOF.Filed by Central Labs-King Khalid University, published 2025-07-17 — illustrates the current wave of filings around novel MOF electrode materials rather than interface engineering on established chemistries.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20120171574A1 | Partially and fully surface-enabled metal ion-exchanging energy storage devices | 127 |
| 2 | US20060194102A1 | Resistive balance for an energy storage device | 99 |
| 3 | US20120077080A1 | Lithium super-battery with a chemically functionalized disordered carbon cathode | 73 |
| 4 | US20120164539A1 | Surface -controlled lithium ion-exchanging energy storage device | 64 |
| 5 | US20120082890A1 | Non-aqueous electrolytes for electrochemical cells | 56 |
| 6 | US20180366280A1 | Electrodes and electrolytes for aqueous electrochemical energy storage systems | 46 |
| 7 | US20140087214A1 | Electrochemical Devices and Methods of Fabrication | 35 |
| 8 | US20050118440A1 | Electrode for an energy storage device | 33 |
| 9 | US20160380259A1 | Metallic surface with karstified relief, forming same, and high surface area metallic electrochemical interfa… | 31 |
| 10 | US10522300B2 | Metallic surface with karstified relief, forming same, and high surface area metallic electrochemical interfa… | 22 |
Citation counts inside a searched corpus favour older records that have had more time to accumulate citations; treat this table as a map of influence, not of current filing activity.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Reading the filing trend, citation pattern and co-assignee network together points to a field that established its core claim territory early and has since narrowed.
Peak activity is behind, not ahead
The 2017 peak of 36 filings has not been matched since; the 2022 midpoint of 15 and the current 9 confirm a sustained decline rather than a temporary dip. New entrants are filing into a field whose core claim space was staked out years ago.
No single classification owns the field
Battery-side and capacitor-side classifications are almost tied, meaning interface engineering claims are being filed from both chemistries at once — a sign the underlying problem, not the device category, is what unites this corpus.
Foundational art sits outside the interface framing
The most-cited records are general energy-storage-device patents from the early 2010s, not interface-specific filings. Anyone filing new interface claims should expect examiners to cite this older foundational layer regardless of how narrowly the claim is drafted.
Collaboration is concentrated, not networked
Ten co-assignee pairs exist across the corpus, with the strongest single pairing filing 11 families together. This is a small, tight collaboration structure rather than a broad multi-party ecosystem.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to asymmetric supercapacitor interface engineering, with the prior art for and against each one.
Who holds the ground, and where activity has stalled
Recent-year momentum data shows the assignees most associated with this corpus recorded zero filings in the latest year — consistent with the broader decline from 2017's peak.
Zhamu Aruna and Jang Bor Z
This pairing is the strongest co-assignee relationship in the dataset at 11 shared families, with a secondary pairing (Zhamu Aruna and Neff David) at 6. Both show zero filings in the latest year, matching the field-wide slowdown.
University of California Board of Regents
Paired with Namotek Energy Co. in one of the corpus's strongest collaborations, this assignee's recent-year momentum is also flat at zero, suggesting the collaboration's active filing window has closed rather than paused.
Established materials companies with stalled recent output
Asahi Kasei and UBE Corporation both appear among the tracked assignees but show no filings in the most recent year, consistent with the corpus-wide decline rather than any company-specific retreat.
| Assignee | Recent year | YoY |
|---|---|---|
| The Regents of the University of California | 0 | — |
| Nohms Technologies, Inc. | 0 | — |
| Asahi Kasei Corporation | 0 | — |
| UBE Corporation | 0 | — |
| ZHAMU ARUNA | 0 | — |
| JANG BOR Z | 0 | — |
| Theionic Energy Co. | 0 | — |
| Namotek Energy Co. | 0 | — |
Where to take this analysis
The trend and assignee data point to specific next steps depending on whether the goal is freedom-to-operate, sourcing, or identifying open claim space.
Check freedom-to-operate against the cited core
Before drafting new interface claims, review the foundational energy-storage-device patents that dominate the citation table — they are likely to surface in any examiner search regardless of how the new claim is framed.
Explore in EurekaTrack whether the 2017 peak assignees have exited or paused
Zero recent-year filings from several previously active assignees could mean exit, consolidation, or simply a pause ahead of the next filing wave — worth confirming before assuming the space is abandoned.
Explore in EurekaMap the materials-chemistry periphery
Smaller IPC clusters in organo-metallic, inorganic and heterocyclic compounds suggest new electrode and electrolyte materials are entering the field faster than interface-specific claims are following them.
Explore in EurekaCommon questions on this landscape
An asymmetric supercapacitor pairs two electrodes with different charge-storage mechanisms, typically one battery-type (faradaic) electrode and one capacitive electrode, to extend voltage window and energy density beyond a symmetric design. In this dataset the search deliberately captures both 'asymmetric supercapacitor' and 'hybrid supercapacitor' phrasing, plus the older term 'asymmetric capacitor', because assignees are inconsistent about which label they use. This is why the corpus spans both H01G (capacitor) and H01M (battery) classifications almost evenly.
The trend data shows filings falling from a peak of 36 in 2017 to 9 in the most recent partial year, with the 2022 midpoint of 15 confirming a genuine multi-year decline rather than noise. This does not necessarily mean interest in asymmetric supercapacitors has fallen generally — it means the specific combination of asymmetric/hybrid design claims layered with electrode-electrolyte or electrode-collector interface language has become less common, possibly because core interface techniques from the 2015-2018 wave are now treated as established practice rather than patentable novelty. Readers should also account for publication lag: the last one to two years will revise upward as more filings publish.
The most-cited records in this corpus, led by US20120171574A1 with 127 citations, are general energy-storage-device patents from the early 2010s rather than filings narrowly scoped to interface engineering. This matters for search strategy: high citation counts here reflect age and broad applicability within the corpus, not that these are the most technically current or most frequently licensed interface patents. Newer, more narrowly scoped interface filings may be technically more relevant even with lower citation counts.
Based on the IPC composition, the smaller clusters — nanotechnology applications (B82Y), heterocyclic compounds (C07D), and non-carbon organo-metallic compounds (C07F) — carry far fewer records than the dominant H01M/H01G core, suggesting thinner claim density around MOF-derived and heterocyclic-additive approaches to the electrode-electrolyte interface. Current-collector surface texturing specifically for asymmetric (mixed-chemistry) stacks also appears under-represented relative to general interfacial-resistance claims. Anyone filing in these adjacent branches should still check the foundational citation cluster for freedom-to-operate risk.
Recent-year momentum data shows that several previously prominent assignees, including university research groups and established materials companies, recorded zero filings in the latest tracked year. This is consistent with the field-wide decline from the 2017 peak rather than indicating any single company's retreat. Because publication lag means the most recent one to two years understate true activity, current-year silence should be treated as a data-timing artefact until confirmed against a longer window.
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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.