Asymmetric Supercapacitor Safety Patents: Leaders, Trends & Gaps 2026
- 16 families total, with filing activity peaking at 5 in 2021 and flattening out afterward rather than building steadily.
- H01M outweighs H01G nearly 3-to-1, meaning most safety and compliance claims are being filed from the battery and power-system side, not the capacitor side.
- One filing carries 99 citations, a resistive-balancing patent from 2006 that still anchors much of the later balancing-safety art in this space.
A thin, fragmented claim space anchored by one old filing
Sixteen published patent families make up the entire tracked corpus for asymmetric supercapacitor safety and compliance — a search combining asymmetric, hybrid or asymmetric-capacitor terminology with overvoltage protection, thermal safety or cell-balancing safety. That is a small set by patent-landscape standards, and it behaves like one: filing activity peaked at 5 records in 2021 and had fallen to zero by the 2022 midpoint, with no clear recovery visible in the years since.
The technology composition is the more useful signal. H01M (batteries, cells and fuel cells) accounts for 10 of the tagged records versus just 4 in H01G, the subclass specific to capacitors — meaning most of the safety and compliance claim activity here is being filed from the battery and power-system side of the industry, not from dedicated capacitor manufacturers.
One filing dominates the citation picture: a 2006 resistive-balance patent sits at 99 citations, an order of magnitude above every other record in the set, with its earlier WIPO filing adding further weight. Co-filing activity is sparse and largely inventor-led rather than corporate, with 10 co-assignee pairs across the whole dataset and no single organisation showing sustained recent-year growth.
Filing trend and technology composition
Sixteen published families span 2015 through the 2026 cut-off, with filing activity concentrated in a single peak year rather than building steadily. The IPC spread shows where the safety and compliance claims actually sit — mostly inside battery and power-system classifications, not inside capacitor-specific art.
Filing activity by year
Filings peaked at 5 in 2021, then dropped to zero at the 2022 midpoint — a flat-to-declining pattern rather than sustained growth. Remember that publication lags filing by roughly 18 months, so the most recent years understate true filing activity.
IPC subclass composition
H01M (batteries, cells and fuel cells) carries the largest share at 10 of the tagged records, with H02J (power supply and grid systems) second at 6. H01G, the subclass specific to capacitors themselves, holds only 4 — a reminder that most of the safety and compliance claim activity in this search is being made from the battery and power-system side, not the capacitor side.
Shares are the percentage of the 16 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaThe filings shaping this claim space
Asymmetric testing and deployment of storage devices
Energy storage cells are typically tested with equal charge and discharge currents, and deployments are limited to those currents for safety. This filing describes a cyclical testing methodology that determines maximum safe charge and discharge currents where the two are unequal, enabling charge-intensive or discharge-intensive deployments that make fuller use of a cell's fast charging or fast discharging capability while keeping the opposite direction at a less demanding rate. A profile manager controls deployed cells under continuous, high-duty-cycle or intermittent high-power use.Filed 2026-06-11 by Atlas Power Technologies Inc.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20060194102A1 | Resistive balance for an energy storage device | 99 |
| 2 | WO2004073001A1 | A resistive balance for an energy storage device | 16 |
| 3 | US20230297729A1 | Electrode structure | 5 |
| 4 | WO2022034318A2 | Electrode structure | 4 |
| 5 | US12184100B1 | Hybrid power system with power optimization and methods of use | 2 |
| 6 | US12164837B2 | Electrode structure | 2 |
Citation counts are drawn from the searched corpus and favour older filings; treat them as a measure of influence on subsequent drafting, not of current commercial relevance.
Publication numbers are shown where the record carries one (6 of 6 rows); clicking a row searches Eureka by that number.
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With only 16 families, this is a thin corpus by patent-landscape standards — read the following as directional signals rather than statistically robust conclusions.
Activity front-loaded, not sustained
Filing rose to a peak in 2021 and then fell to zero by the 2022 midpoint. Combined with the 18-month publication lag, the most recent years cannot yet be read as a real decline — but there is no visible ramp back up either.
Safety claims live in battery classifications
H01M nearly triples H01G's count, and H02J adds a further 6. Anyone searching this space by capacitor classification alone will miss most of the relevant safety and compliance art.
One filing anchors the field
US20060194102A1's resistive-balance claim is cited far more than any other record in this set, with its WIPO counterpart adding further weight. Later balancing-safety filings sit in its shadow.
Fragmented, inventor-led filing
The strongest co-filing links are between named individuals rather than corporate assignees, and recent-year momentum across tracked filers is flat or negative — no single organisation has established a dominant, actively growing position.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to asymmetric supercapacitor safety and compliance, with the prior art for and against each one.
Who is filing, and where the gaps sit
No assignee in this dataset shows positive recent-year momentum — the picture is one of isolated filings and inventor-led co-filing rather than a contested race between established players. That makes the gaps as informative as the leaders.
Most recent filer, but not an active program
Atlas Power Technologies Inc. holds the newest representative record in the dataset, filed 2026-06-11, but its recent-year momentum reads as a full year-on-year drop at the assignee level — consistent with a single filing rather than a growing portfolio.
An anchor filing with no active successor
The resistive-balance patent that leads this corpus on citations dates to 2006. Its influence on later drafting is clear from the citation count, but there is no evidence in this dataset of the original filer maintaining an active, growing portfolio around it.
Inventor-led, not corporate-led
The strongest co-filing relationships in the dataset link named individuals rather than corporate entities, pointing to a field still populated by small teams and early-stage filers rather than established competitors defending territory.
| Assignee | Recent year | YoY |
|---|---|---|
| Oxford University Innovation | 0 | — |
| ENERGY STORAGE SYST | 0 | — |
| ATLAS POWER TECHNOLOGIES INC | 0 | -100% |
| TURNER GEOFFREY ALAN | 0 | — |
| PAUL GEORGE LANGE | 0 | — |
| KESHISHIAN SARKIS | 0 | — |
| DRUMMOND CALUM JOHN | 0 | — |
| SHANTHI P | 0 | -100% |
Where to take this analysis
This overview draws on 16 published families current to the 2026 cut-off. The following angles go deeper than a summary page can.
Run a full freedom-to-operate check
The 99-citation resistive-balance filing and its related electrode-structure records are the ones most likely to constrain a new balancing or protection design — worth a dedicated claim chart before committing to an architecture.
Start a claim chart in EurekaTrack the under-claimed branches
Single-record IPC subclasses in medical power, hybrid drivetrains and hoist systems show no second filer yet. Monitoring alerts here would catch a first competitive filing early.
Set up monitoring in EurekaRe-run the search after the publication lag clears
2025 and 2026 filing counts are understated by roughly 18 months of publication lag. Revisiting this trend in a year will give a truer read on whether activity is actually recovering from its 2022 flatline.
Explore trend data in EurekaCommon questions on asymmetric supercapacitor safety patents
In this dataset it means a filing that combines asymmetric or hybrid supercapacitor terminology with a safety mechanism — overvoltage protection, thermal safety or cell-balancing safety — in the title, abstract or claims. It is a narrower slice than general supercapacitor patents, which is why the total family count is small at 16. Most of what qualifies sits inside broader battery or power-system filings rather than standing as capacitor-only art, so a search limited to H01G alone would miss most of the relevant claims.
Filing here is fragmented rather than concentrated: the strongest co-filing relationships are between individual named inventors rather than large corporate portfolios, and recent-year momentum across the tracked assignees reads flat or negative. Atlas Power Technologies Inc. holds the most recent representative filing but shows a 100% year-on-year drop at the assignee level, consistent with an isolated filing rather than an active program. Treat any single assignee's position here as provisional until a larger corpus confirms it.
The trend shows five filings in 2021, the high point in the tracked window, followed by a flat-to-declining pattern into the 2022 midpoint and beyond. Part of this is a real slowdown, but part is a data artefact: publication typically lags filing by around 18 months, so 2025 and 2026 figures are understated simply because later applications have not published yet. Do not read the most recent two years as a genuine collapse in activity without accounting for that lag.
Yes — US20060194102A1, on resistive balance for an energy storage device, carries 99 citations, far ahead of anything else in this corpus, and its related WIPO filing WO2004073001A1 adds 16 more. That citation weight means later balancing-safety filings in this space were very likely drafted with awareness of it. High citation count inside a searched corpus is a signal of influence on subsequent drafting, not necessarily of current commercial dominance, but for freedom-to-operate purposes it is the filing worth checking first.
The IPC composition thins out sharply outside the core H01M and H02J cluster: A61B (diagnosis and surgery), B60W (hybrid vehicle control) and B66C (cranes and hoists) each carry only a single record. These represent specific host applications — medical power packs, hybrid drivetrains, hoist power systems — where a balancing or overvoltage-protection claim tied to that application's duty cycle has not yet been contested by a second filer. That makes them a reasonable place to look for an under-claimed first-mover position.
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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.
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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.