Graphene Supercapacitor Electrode Patent Snapshot
The graphene supercapacitor electrode space is a small, academically weighted field dominated by Chinese institutions and a U.S. materials specialist, with activity easing back from its 2017 peak. Nanotek Instruments and a cluster of Chinese universities hold the leading positions, while the overall corpus remains narrow enough that targeted filings in adjacent branches could establish a defensible position.
A concentrated, China-centric field led by Nanotek Instruments and Chinese research institutions
Nanotek Instruments Inc, National University of Defense Technology, Nanotek Instruments Group LLC, Ningbo CRRC New Energy Technology, and Beihang University each hold 2 patent records — together forming a joint leadership tier at the top of the ranking.
The top five filers account for 53% of the combined patent records held by the ranked applicants visible in this query, signalling high concentration. No single applicant has pulled decisively ahead; instead, a cluster of five co-leaders sits above a long tail of single-record holders.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Nanotek Instruments Inc | 2 | |
| 2 | National University of Defense Technology | 2 | |
| 3 | Nanotek Instruments Group LLC | 2 | |
| 4 | Ningbo CRRC New Energy Technology Co Ltd | 2 | |
| 5 | Beihang University | 2 | |
| 6 | Huabai (Xinxing) Technology Co Ltd | 1 | |
| 7 | Xi’an Jiaotong University | 1 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 8 | SHAANXI UNIV OF SCI & TECH | 1 | |
| 9 | Kente Catalysts Inc | 1 | |
| 10 | Liaoning University | 1 | |
| 11 | NANJING UNIV OF POSTS & TELECOMM | 1 | |
| 12 | Zhejiang Sci-Tech University | 1 | |
| 13 | Nanjing Xuyurui Material Technology Co Ltd | 1 | |
| 14 | Qingdao Jiuzhou Qianhe Machinery Co Ltd | 1 |
The leadership structure reflects a field still shaped largely by university and state-affiliated research rather than commercial scale-up; only Nanotek Instruments and Ningbo CRRC represent private or commercially oriented entities in the leading tier.
The most recent 18–24 months of filings are subject to publication lag and are likely under-counted; observed zeros in 2025–2026 should not be read as a permanent halt. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing activity peaked in 2017 and has eased; capacitor-core IPC dominates the technology mix
The annual trend and IPC composition charts together show a field that established its technical foundations early and has since narrowed in annual output, while remaining anchored to capacitor-specific classification.
Annual filing trend
Filings peaked at 5 records in 2017 and have trended down to 1 or fewer per year since 2020. The field is in a post-peak phase on a multi-year basis; the near-zero readings in 2023–2026 partly reflect publication lag and should be interpreted cautiously rather than as a cessation of activity.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01G (Capacitors) is visible in the IPC mix with 19 patent records, reflecting the core supercapacitor device focus. C01B (Non-metallic elements and inorganic compounds, including graphene synthesis) is the second branch, followed by C04B (Ceramics and refractories), C09D (Coatings and inks), and H01M (Batteries and fuel cells), each at 2 records — all three representing notably sparse adjacent branches.
↗ 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.
Supercritical fluid production of graphene-based s…
Provided is a process for producing a graphene-based supercapacitor electrode from a supply of coke or coal powder, comprising: (a) exposing this powder to a supercritical fluid for a period of time in a pressure vessel to enable penetration of the supercritical fluid into internal structure of the coke or coal; wherein the powder is selected from petroleum… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 石墨烯、石墨烯电极、石墨烯超级电容器及其制备方法 | 25 |
| 2 | Supercritical Fluid Production of Graphene-Based S… | 21 |
| 3 | 一种高比电容的细菌纤维素基柔性氮掺杂石墨烯超级电容器电极材料及其制备方法和应用 | 13 |
| 4 | 一种柔性纸基石墨烯超级电容器制备方法 | 13 |
| 5 | 一种提高石墨烯基超级电容器的比电容的方法 | 11 |
| 6 | 石墨烯薄膜、石墨烯超级电容器及其制备方法 | 9 |
| 7 | 一种石墨烯电极片及其制备方法及用其制备超级电容器的方法 | 7 |
| 8 | Supercritical fluid production of graphene-based s… | 5 |
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.
Nanotek Instruments Inc
Nanotek Instruments holds 2 patent records and is affiliated with Nanotek Instruments Group LLC, which holds a further 2 — giving the combined Nanotek entity the broadest footprint in the corpus. Its technology emphasis spans H01G 11 (Capacitors), C01B 32 (non-metallic elements and inorganic compounds including graphene), and C04B 35 (Ceramics and refractories), reflecting a materials-to-device coverage strategy. Momentum data is not separately flagged for this applicant in the recent-period evidence.
patent records: 2National University of Defense Technology
National University of Defense Technology holds 2 patent records with a dual focus on C09D 11 (Coatings and inks) and H01G 11 (Capacitors), making it the only top-tier filer with meaningful activity in the coatings branch — a technically adjacent route relevant to printed and flexible supercapacitor formats. Its state-affiliated status suggests a research-driven rather than commercialization-driven filing posture.
patent records: 2Frequently asked questions
The corpus contains 13 patent families in scope. This is a relatively small and specialized corpus, which makes individual filings more consequential for freedom-to-operate and competitive positioning.
Nanotek Instruments Inc, National University of Defense Technology, Nanotek Instruments Group LLC, Ningbo CRRC New Energy Technology Co Ltd, and Beihang University each hold 2 patent records, forming a joint leadership tier. The remaining applicants each hold 1 patent record.
Evidence classifies the field as Decline, with annual filings easing back from a peak of 5 records in 2017. Recent-year readings near zero are partly attributable to publication lag, so the field has not necessarily ceased activity entirely, but the multi-year trajectory is downward.
China is the leading jurisdiction with 14 patent records, followed by WIPO PCT with 3 and the United States with 2. The limited PCT and U.S. coverage indicates that most innovations have not been broadly internationalized.
H01G (Capacitors) is visible in with 19 patent records. C01B (Non-metallic elements and inorganic compounds) is second with 4 records. C04B (Ceramics and refractories), C09D (Coatings and inks), and H01M (Batteries and fuel cells) each have only 2 records, making them the sparsest adjacent branches.
Evidence shows one co-filing relationship: Kente Catalysts Inc and Zhejiang Sci-Tech University filed jointly. No broader multi-party consortia are documented in this corpus, indicating that cross-sector collaboration is limited in the current landscape.
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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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