EDLC Temperature & Cycling Durability Patent Snapshot
The EDLC temperature and cycling durability space is a small, concentrated field dominated by Maxwell Technologies and a handful of research institutions, with the United States as the primary filing jurisdiction. Annual activity peaked in 2018 and has since eased substantially, signalling a maturing or declining innovation cycle with limited new entrants.
Maxwell Technologies leads a highly concentrated, small-corpus field
Maxwell Technologies Global LLC holds the top position with 9 patent records, followed by Yeda Research & Development Co. Ltd. with 6 and Battelle Memorial Institute with 5. The top five filers together account for 46% of the ranked applicants visible in this query’ combined total, underscoring a tight visible assignee structure.
The gap between the first-tier (Maxwell, Yeda, Battelle) and the remaining ranked applicants is pronounced: no other organisation exceeds 3 patent records. This tier gap means that a small number of incumbents effectively define the prior-art evidence snapshot for temperature and cycling durability in EDLCs.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Maxwell Technologies Global LLC | 9 | |
| 2 | YEDA RES & DEV CO LTD | 6 | |
| 3 | Battelle Memorial Institute | 5 | |
| 4 | Gegadyne Energy Labs Pvt. Ltd. | 3 | |
| 5 | Sichuan Jinshi New Energy Technology Co., Ltd. | 2 | |
| 6 | Meidensha Corporation | 2 | |
| 7 | Maxwell Technologies Inc. | 2 | |
| 8 | Sustainable Energy Technologies Inc. | 2 | |
| 9 | NEC Corporation | 2 | |
| 10 | GM Global Technology Operations LLC | 2 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Chubu Electric Power Co., Inc. | 2 | |
| 12 | Pocell Tech Ltd. | 2 | |
| 13 | Toho Rayon Co., Ltd. | 2 | |
| 14 | DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD | 1 | |
| 15 | Honda Motor Co., Ltd. | 1 | |
| 16 | Centre for Materials for Electronics Technology (C-MET), Director General | 1 | |
| 17 | UCAP Power Inc. | 1 | |
| 18 | THE SECRETARY MINISTRY OF ELECTRONICS & INFORMATIO… | 1 | |
| 19 | Imam Abdulrahman Bin Faisal University | 1 | |
| 20 | LCC CICE Compagnie Europeenne de Composants Electroniques | 1 |
Maxwell’s dual presence — through both Maxwell Technologies Global LLC and Maxwell Technologies Inc. — reinforces its structural dominance. Battelle Memorial Institute’s portfolio skews toward defence applications, suggesting that ruggedised, wide-temperature-range EDLC designs have attracted government-sponsored R&D alongside commercial development.
Filings from approximately 2024–2026 are likely under-counted due to standard patent publication lag; the most recent period should be interpreted with caution. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity peaked in 2018 and has retreated; capacitor IPC dominates the technology mix
The filing trend and technology composition charts together reveal a field that burst briefly to a 2018 peak and has since contracted, while remaining anchored almost entirely in the core capacitor IPC class.
Annual filing trend
Filings rose sharply to a peak of 10 records in 2018, then fell back. The post-2021 figures (2022–2026) are low and partially affected by publication lag; the recent-window growth figure of -75% confirms that activity has meaningfully eased from the 2018 peak rather than plateaued. Do not interpret the near-zero 2023–2026 bars as an absolute floor — some filings from that period are still awaiting publication.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01G (Capacitors) accounts for 50 of the classified patent records, making it the overwhelming visible branch. Adjacent branches — H01M (Batteries, cells and fuel cells), B60L (Electric vehicle propulsion), C01B (Non-metallic elements and inorganic compounds), F41H (Armour and military defence), and H02J (Power supply and grid systems) — each carry single-digit counts, indicating that temperature and cycling durability work has largely remained within the core capacitor discipline rather than spreading into system-level or materials-science sub-classes.
↗ 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.
Supercapacitor to electrochemical hybrid system wi…
A method for powering an electric vehicle including an electrochemical battery and one or more supercapacitor batteries includes determining self-discharge rate data for the one or more supercapacitor batteries and, in response to the self-discharge rate data satisfying at least one threshold condition, notifying a user to charge the one or more… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Method of supplying electric current, method of st… | 56 |
| 2 | Electrolyte for three-VOLT ultracapacitor | 17 |
| 3 | Electric double-layer capacitor | 15 |
| 4 | Acrylonitrile system active carbon fiber for polar… | 13 |
| 5 | Carbon surface modification for three-volt ultraca… | 12 |
| 6 | A method for forming a graphene-based structure on… | 7 |
| 7 | High capacitance composites | 7 |
| 8 | Aqueous-Based Electric Double-Layer Capacitor | 7 |
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.
Maxwell Technologies Global LLC
Maxwell Technologies Global LLC holds 9 patent records, the largest share in the corpus. Its technology focus is concentrated in H01G 11 (electrochemical double-layer capacitors) with 12 classified records at that sub-class level, supplemented by H01G 9 and a minor H01M 6 position. The portfolio is the direct successor to Maxwell Technologies Inc.’s earlier filings, giving the combined Maxwell entity a commanding prior-art footprint in cell-level durability design. No applicant momentum data is available for the recent period.
patent records: 9Yeda Research & Development Co. Ltd.
Yeda Research & Development Co. Ltd., the technology-transfer arm of the Weizmann Institute of Science, holds 6 patent records exclusively classified under H01G 11. Its portfolio appears anchored in advanced electrolyte and materials chemistry for extended-voltage and extended-temperature operation, consistent with academic research programmes targeting fundamental durability mechanisms. No applicant momentum data is available for the recent period.
patent records: 6Frequently asked questions
The corpus contains 30 patent families in scope. This is a small, specialised niche within the broader electrochemical capacitor field, making thorough freedom-to-operate review feasible.
Maxwell Technologies Global LLC leads with 9 patent records, followed by Yeda Research & Development Co. Ltd. with 6 and Battelle Memorial Institute with 5. These three organisations define the prior-art core.
The United States is the primary jurisdiction with 16 patent records, followed by Japan with 10 and WIPO (PCT) with 9. China and Europe (EPO) each carry 4 records, and India carries 3.
The field is classified as Decline. Annual filings peaked at 10 records in 2018 and have eased back significantly since, with a recent-window growth figure of -75%. Core durability problems appear to have attracted concentrated effort that has now subsided.
H01G (Capacitors) is visible in with 50 classified patent records. Adjacent classes with sparse coverage include H01M (7 records), B60L (5 records), C01B (5 records), F41H (4 records), and H02J (4 records), each representing areas where prior art is thin relative to the core class.
Evidence shows one co-applicant relationship: Meidensha Corp and Chubu Electric Power Co. filed 2 records jointly. No other collaboration pairs are present in the evidence, indicating that the field has developed primarily through independent proprietary research.
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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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