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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/supercapacitors-and-hybrid-energy-storage-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Batteries & Energy StorageSupercapacitor and Hybrid Energy Storage Patents
- Filings have cooled since 2018. The peak year was 2018 at 268 filings; by the 2022 midpoint volume had settled near 212, and the trend since reads flat to declining rather than growing.
- Capacitor-class claims dominate the corpus. H01G accounts for 3,205 of 3,353 records, with battery-adjacent H01M claims (727) and carbon/nanomaterial classes (C01B, B82Y) forming the next tier.
- Citation weight sits with early graphene and nanotube electrode work. The most-cited records date from the 2000s, meaning influence in this corpus still traces back to foundational electrode-material patents rather than recent filings.
3,353
Published Records
10%
Top-5 Share of All Records
+7%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (196 records) with 2024 (209) — 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 3,353 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What the supercapacitor patent record shows
Supercapacitors and hybrid energy storage devices sit at the intersection of capacitor engineering and battery chemistry, and the patent record reflects that split. The bulk of activity, measured across 3,353 patent families published between 2015 and mid-2026, is filed under capacitor classifications rather than battery ones, even though the search deliberately pulls in battery-adjacent IPC codes. Power density, self-discharge suppression, electrode surface area and electrolyte voltage window are the recurring technical anchors in the claim language, which tells you where applicants believe the remaining performance gains are contestable.
Filing activity rose through the mid-2010s, peaked in 2018, and has not returned to that level since — a pattern more consistent with a maturing claim space than an emerging one. Recent-year counts are necessarily undercounted, since publication typically lags filing by around 18 months, but the multi-year plateau before that lag window still points to a technology where the core architecture is well staked out.
Filing activity, 2017–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Supercapacitors and Hybrid Energy Storage covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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Data
Filing trends and technology composition
Two views of the same 3,353-family dataset: filing volume over time, and how those filings distribute across IPC subclasses.
A plateau after 2018, not sustained growth
Filings ran at 250 in 2017, peaked at 268 in 2018, and sat at 212 by the 2022 midpoint — a flat-to-declining pattern through to 2026's partial-year count of 57. Read the last one to two years as undercounted rather than as a real drop-off, given typical publication lag.
Capacitor claims outweigh battery claims by roughly 4:1
H01G (capacitors) carries 3,205 records versus 727 for H01M (batteries, cells and fuel cells), with C01B (356) and B82Y (249) showing that carbon and nanomaterial chemistry is the dominant secondary axis of claiming, ahead of grid-integration codes like H02J (89).
Shares are the percentage of the 3,353 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Supercapacitors and Hybrid Energy Storage covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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The records this field cites most
Representative filing
Electric double layer capacitor, electrolytic solution therefore and method for suppressing self-discharge in electronic component
SANYO CHEMICAL INDUSTRIES, LTD.
An electric double layer capacitor using an electrolytic solution containing a polymer, such as an acrylonitrile/styrene copolymer, to raise electrolyte ion diffusion resistance and thereby improve retention of residual voltage and suppress self-discharge. The approach is framed for back-up power applications such as real-time clocks, and extends to related components including aluminum electrolytic capacitors and secondary batteries.Filed by Sanyo Chemical Industries — an early example of formulating the electrolyte itself, rather than the electrode, as the lever for self-discharge control.
Most-cited patents in the corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7623340B1 | Nano-scaled graphene plate nanocomposites for supercapacitor electrodes | 417 |
| 2 | US6252762B1 | Rechargeable hybrid battery/supercapacitor system | 368 |
| 3 | US7061749B2 | Supercapacitor having electrode material comprising single-wall carbon nanotubes and process for making the s… | 244 |
| 4 | US20100021819A1 | Graphene nanocomposites for electrochemical cell electrodes | 223 |
| 5 | US20110183180A1 | Flexible asymmetric electrochemical cells using nano graphene platelet as an electrode material | 207 |
| 6 | US20090061312A1 | Method of producing graphite-carbon composite electrodes for supercapacitors | 186 |
| 7 | US20090059474A1 | Graphite-Carbon composite electrode for supercapacitors | 177 |
| 8 | US5426561A | High energy density and high power density ultracapacitors and supercapacitors | 155 |
| 9 | US20060098389A1 | Supercapacitor having electrode material comprising single-wall carbon nanotubes and process for making the s… | 142 |
| 10 | US6454816B1 | Supercapacitor using electrode of new material and method of manufacturing the same | 130 |
Citation counts reflect influence within this searched corpus and skew toward older, foundational filings — not toward what is most commercially active today.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Supercapacitors and Hybrid Energy Storage covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing decision
Three signals stand out once volume, class distribution and citation weight are read together.
Filing volume
268 → 212 → 57
peak (2018) → midpoint (2022) → latest partial year
The growth phase has already happened
Volume peaked in 2018 and has not exceeded that level since. A flat-to-declining trend across a near-decade window is a sign that core architectures — electrode material, electrolyte formulation, cell packaging — are heavily claimed, and new filings increasingly compete for narrower improvements.
Based on 2017–2026 filing counts
Class distribution
3,205 vs 727
H01G capacitor records vs H01M battery records
This is a capacitor field with battery-adjacent spillover
Even with battery IPC codes deliberately included in the search, capacitor classification dominates by roughly 4 to 1. Hybrid battery-capacitor claims exist but remain the smaller share, which is useful context for anyone benchmarking a hybrid device against the wrong baseline.
IPC subclass counts, this corpus
Citation concentration
417 citations
top-cited record, US7623340B1
Influence still traces to graphene and nanotube electrode work
The most-cited records — on graphene plate nanocomposites, carbon nanotube electrodes and flexible graphene-platelet cells — predate most of the filing window. New entrants building on carbon-nanomaterial electrodes are almost certainly filing in citation range of this earlier work.
Citation counts within searched corpus
Co-filing structure
43 co-filings
strongest assignee pair, Zhamu Aruna + Jang Bor Z
A small number of inventor pairs anchor a large share of related filings
Only 10 co-assignee pairs appear in the dataset, and the strongest single pair accounts for a disproportionate filing count. That concentration is worth tracking directly rather than treating the two names as independent competitors.
Co-assignee pair analysis
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to supercapacitors and hybrid energy storage, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Supercapacitors and Hybrid Energy Storage covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is active, and where momentum has stalled
Recent-year filing counts across tracked assignees are low across the board, which is consistent with the corpus-wide plateau rather than any single company pulling back.
Individual inventor-assignee
43 co-filings
with Jang Bor Z
Zhamu Aruna
The strongest co-assignee relationship in the dataset, tied to carbon nanomaterial and graphene electrode work. Recent-year activity under this name has dropped to zero, consistent with the broader plateau in this corpus.
Co-assignee pair data
Corporate assignee
0 in latest year
recent-year filings
Nanotek Instruments
Historically associated with graphene and nanocomposite electrode filings referenced elsewhere in this corpus's most-cited records, but shows no filings in the latest tracked year.
Recent-year momentum tracking
University assignee
1 in latest year
recent-year filings
University of California Board of Regents
One of the few assignees still showing any activity in the latest year, though at low volume — a pattern typical of academic assignees in a plateaued field.
Recent-year momentum tracking
University assignee
-86% YoY
year-over-year change
Imam Abdulrahman Bin Faisal University
Filed 1 record in the latest tracked year, down 86% year-over-year — illustrative of how thin recent-year counts are across almost every named assignee in this dataset.
Recent-year momentum tracking
Recent-year filing momentum
| Assignee | Recent year | YoY |
|---|---|---|
| Regents of the University of California | 1 | — |
| IMAM ABDULRAHMAN BIN FAISAL UNIV | 1 | -86% |
| Corning Incorporated | 0 | — |
| Nanotek Instruments, Inc. | 0 | — |
| FastCAP Systems Corporation | 0 | — |
| ZHAMU ARUNA | 0 | — |
| JANG BOR Z | 0 | — |
| Asahi Glass Co., Ltd. (AGC) | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Supercapacitors and Hybrid Energy Storage covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The trend and class data point to a field where architecture is settled but specific formulations remain open to challenge.
Map the white space before drafting claims
Under-claimed branches like electrolyte additive chemistry and hybrid cell packaging sit adjacent to dense prior art rather than inside it — worth a focused search before committing claim language.
Explore white space in EurekaTrack the assignees still filing
Recent-year momentum is thin across nearly every named assignee in this corpus. A shortlist of the few still active is more useful than a full competitor list.
Build a watchlist in EurekaRead the foundational citations directly
The most-cited records in this corpus predate most of the filing window and still shape how new electrode claims are framed. Understanding them clarifies what a new filing needs to distinguish itself from.
Review key patents in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Supercapacitors and Hybrid Energy Storage covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions about supercapacitor patents
This dataset tracks 3,353 patent families filed under supercapacitor, electric double layer capacitor and lithium-ion capacitor terminology between 2015 and mid-2026. Filing activity peaked in 2018 at 268 records and has since settled to a flat or declining trend, with 212 filings recorded at the 2022 midpoint. The most recent one to two years will appear lower than they eventually turn out to be, because publication typically lags filing by around 18 months.
Citation counts within this corpus point to a small set of older filings on graphene and carbon nanotube electrode materials as the most influential, led by a record on nano-scaled graphene plate nanocomposites cited 417 times. These foundational patents predate most of the filing window, so high citation counts here reflect long-standing influence rather than current filing activity. Newer entrants working on carbon-nanomaterial electrodes are likely filing within citation range of this earlier work.
Predominantly capacitor-focused: IPC subclass H01G (capacitors) accounts for 3,205 of the 3,353 records in this dataset, versus 727 for H01M (batteries, cells and fuel cells), even though the search intentionally includes battery-adjacent classifications. Carbon and nanomaterial chemistry classes (C01B, B82Y) form a distinct secondary cluster. Anyone benchmarking a hybrid battery-capacitor device should treat capacitor claim conventions as the dominant baseline, not battery ones.
Based on IPC composition and claim density, the thinner branches sit in electrolyte additive chemistry for self-discharge suppression, hybrid battery-capacitor cell packaging, grid-integration control circuitry overlapping with H02J, and condensation-polymer separator materials. These sit adjacent to dense prior art in core electrode and electrolyte claims rather than replacing it, so a freedom-to-operate search is still advisable before drafting. None of these branches shows the filing density seen in core electrode-material claims.
The filing trend in this dataset rose through the mid-2010s, peaked in 2018 at 268 records, and has not returned to that level since, with the 2022 midpoint at 212. This pattern is more consistent with a maturing claim space — where core electrode, electrolyte and packaging architectures are already heavily filed — than with a technology losing commercial relevance. High filing density in earlier years means claim space is occupied, which naturally slows the rate of new filings covering the same ground.
Answers are grounded in the same dataset. Derived from a Patsnap search on Supercapacitors and Hybrid Energy Storage covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.